path: root/2023/info/emms-after.md

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<a name="emms-mainVideo-transcript"></a>
# Transcript


Introduction

[[!template new="1" text="""The Sound of Emacs, Emms, The Emacs Multimedia System.""" start="00:00:00.000" video="mainVideo-emms" id="subtitle"]]
[[!template text="""Hi, I'm Yoni Rabkin and I'll be talking about Emms;""" start="00:00:05.400" video="mainVideo-emms" id="subtitle"]]
[[!template text="""the Emacs Multimedia System.""" start="00:00:09.160" video="mainVideo-emms" id="subtitle"]]
[[!template text="""What is Emms?""" start="00:00:11.520" video="mainVideo-emms" id="subtitle"]]
[[!template text="""Emms displays and plays media from within Emacs""" start="00:00:14.560" video="mainVideo-emms" id="subtitle"]]
[[!template text="""using a variety of external players""" start="00:00:18.120" video="mainVideo-emms" id="subtitle"]]
[[!template text="""and from different media sources.""" start="00:00:20.520" video="mainVideo-emms" id="subtitle"]]
[[!template text="""Emms can run as a minimalistic player""" start="00:00:23.540" video="mainVideo-emms" id="subtitle"]]
[[!template text="""which is controlled with no more than""" start="00:00:26.680" video="mainVideo-emms" id="subtitle"]]
[[!template text="""a handful of simple M-x commands,""" start="00:00:28.560" video="mainVideo-emms" id="subtitle"]]
[[!template text="""or as a fully-fledged interactive media browser and player.""" start="00:00:31.120" video="mainVideo-emms" id="subtitle"]]
[[!template text="""Emms can display album art, play streaming audio,""" start="00:00:36.060" video="mainVideo-emms" id="subtitle"]]
[[!template text="""tag music files, search for lyrics,""" start="00:00:40.640" video="mainVideo-emms" id="subtitle"]]
[[!template text="""provide MPD connectivity, control the volume,""" start="00:00:43.440" video="mainVideo-emms" id="subtitle"]]
[[!template text="""and more. Much more.""" start="00:00:46.680" video="mainVideo-emms" id="subtitle"]]
[[!template text="""The Emms project acts like Emacs in microcosm.""" start="00:00:49.620" video="mainVideo-emms" id="subtitle"]]
[[!template text="""It slowly but surely grows bigger""" start="00:00:53.880" video="mainVideo-emms" id="subtitle"]]
[[!template text="""and gets ever more features.""" start="00:00:56.560" video="mainVideo-emms" id="subtitle"]]
[[!template text="""Perhaps Emms will one day even have a text editor.""" start="00:00:58.480" video="mainVideo-emms" id="subtitle"]]

The structure of this talk

[[!template new="1" text="""The structure of this talk:""" start="00:01:03.320" video="mainVideo-emms" id="subtitle"]]
[[!template text="""We'll start with an introduction to Emms.""" start="00:01:05.600" video="mainVideo-emms" id="subtitle"]]
[[!template text="""This is the practical part.""" start="00:01:08.160" video="mainVideo-emms" id="subtitle"]]
[[!template text="""Then, a bit about how Emms works. That's the technical part.""" start="00:01:10.560" video="mainVideo-emms" id="subtitle"]]
[[!template text="""Finally, how we work. All about Emms development.""" start="00:01:15.880" video="mainVideo-emms" id="subtitle"]]

Introduction to Emms: The practical part

[[!template new="1" text="""Introduction to Emms: The practical part:""" start="00:01:21.320" video="mainVideo-emms" id="subtitle"]]
[[!template text="""I want this talk to be of immediate use to people,""" start="00:01:25.021" video="mainVideo-emms" id="subtitle"]]
[[!template text="""so I'm going to present a quick TL;DR of the Emms manual""" start="00:01:28.680" video="mainVideo-emms" id="subtitle"]]
[[!template text="""concerning installation and use.""" start="00:01:33.520" video="mainVideo-emms" id="subtitle"]]
[[!template text="""By the end of this part you should be able to""" start="00:01:36.400" video="mainVideo-emms" id="subtitle"]]
[[!template text="""install, configure, and use Emms in a variety of ways.""" start="00:01:38.440" video="mainVideo-emms" id="subtitle"]]
[[!template text="""Where can I get Emms?""" start="00:01:45.280" video="mainVideo-emms" id="subtitle"]]
[[!template text="""Emms is distributed primarily via GNU ELPA.""" start="00:01:48.120" video="mainVideo-emms" id="subtitle"]]
[[!template text="""So it's really only a M-x list-packages away at any moment.""" start="00:01:54.320" video="mainVideo-emms" id="subtitle"]]
[[!template text="""There's also a website hosted at gnu.org.""" start="00:02:02.080" video="mainVideo-emms" id="subtitle"]]
[[!template text="""Among other things on the website, you'll find""" start="00:02:07.720" video="mainVideo-emms" id="subtitle"]]
[[!template text="""a copy of the friendly, robust, and up-to-date user manual.""" start="00:02:11.020" video="mainVideo-emms" id="subtitle"]]
[[!template text="""Installing Emms has become progressively easier over time""" start="00:02:21.280" video="mainVideo-emms" id="subtitle"]]
[[!template text="""and will continue to get easier.""" start="00:02:25.920" video="mainVideo-emms" id="subtitle"]]
[[!template text="""In the bad old days, it required downloading a tarball""" start="00:02:28.720" video="mainVideo-emms" id="subtitle"]]
[[!template text="""and compiling a C language shim""" start="00:02:32.560" video="mainVideo-emms" id="subtitle"]]
[[!template text="""to enable reading metadata from media files.""" start="00:02:35.060" video="mainVideo-emms" id="subtitle"]]
[[!template text="""But those days are long gone, and installing Emms is now""" start="00:02:38.920" video="mainVideo-emms" id="subtitle"]]
[[!template text="""as easy as invoking M-x list-packages,""" start="00:02:43.360" video="mainVideo-emms" id="subtitle"]]
[[!template text="""installing the Emms package, and placing as few as""" start="00:02:47.040" video="mainVideo-emms" id="subtitle"]]
[[!template text="""2 or 3 lines of configuration in your Emacs initialization.""" start="00:02:51.840" video="mainVideo-emms" id="subtitle"]]
[[!template text="""So after the package is installed via ELPA,""" start="00:02:57.720" video="mainVideo-emms" id="subtitle"]]
[[!template text="""you can add these few lines.""" start="00:03:02.840" video="mainVideo-emms" id="subtitle"]]
[[!template text="""`emms-all` will make available all of the stable features""" start="00:03:08.440" video="mainVideo-emms" id="subtitle"]]
[[!template text="""which are shipped with Emms.""" start="00:03:12.360" video="mainVideo-emms" id="subtitle"]]
[[!template text="""The `emms-player-list` variable is a list of players""" start="00:03:15.740" video="mainVideo-emms" id="subtitle"]]
[[!template text="""like MPV, MPlayer, VLC, etc.""" start="00:03:20.840" video="mainVideo-emms" id="subtitle"]]
[[!template text="""Emms will call and control these external players""" start="00:03:25.600" video="mainVideo-emms" id="subtitle"]]
[[!template text="""to play your media.""" start="00:03:29.400" video="mainVideo-emms" id="subtitle"]]
[[!template text="""The variable `emms-info-functions` is a list of ways""" start="00:03:32.000" video="mainVideo-emms" id="subtitle"]]
[[!template text="""for Emms to read the metadata in your media files""" start="00:03:36.660" video="mainVideo-emms" id="subtitle"]]
[[!template text="""so that Emms can display song title, artist name,""" start="00:03:40.960" video="mainVideo-emms" id="subtitle"]]
[[!template text="""year of production, etc.""" start="00:03:45.280" video="mainVideo-emms" id="subtitle"]]
[[!template text="""The `emms-info-native` feature in the setup example""" start="00:03:49.480" video="mainVideo-emms" id="subtitle"]]
[[!template text="""is the built-in metadata reader""" start="00:03:55.200" video="mainVideo-emms" id="subtitle"]]
[[!template text="""written entirely in Emacs Lisp.""" start="00:03:58.160" video="mainVideo-emms" id="subtitle"]]
[[!template text="""But there are also other backends""" start="00:04:01.800" video="mainVideo-emms" id="subtitle"]]
[[!template text="""which can call external programs for info""" start="00:04:04.240" video="mainVideo-emms" id="subtitle"]]
[[!template text="""such as TinyTag, the TagLib library, exiftool, and so on.""" start="00:04:07.720" video="mainVideo-emms" id="subtitle"]]
[[!template text="""You can then old-school restart your Emacs""" start="00:04:14.720" video="mainVideo-emms" id="subtitle"]]
[[!template text="""or simply evaluate the above couple of lines to get going.""" start="00:04:17.560" video="mainVideo-emms" id="subtitle"]]
[[!template text="""Now that we have Emms installed and configured,""" start="00:04:22.800" video="mainVideo-emms" id="subtitle"]]
[[!template text="""we should load some media for player.""" start="00:04:26.280" video="mainVideo-emms" id="subtitle"]]
[[!template text="""There are multiple ways to load media into Emms for playing.""" start="00:04:29.240" video="mainVideo-emms" id="subtitle"]]
[[!template text="""They can be directories with local files,""" start="00:04:32.720" video="mainVideo-emms" id="subtitle"]]
[[!template text="""synchronized from a remote instance of""" start="00:04:36.280" video="mainVideo-emms" id="subtitle"]]
[[!template text="""a music player daemon, PLS or M3U playlists,""" start="00:04:38.520" video="mainVideo-emms" id="subtitle"]]
[[!template text="""a list of URLs for streaming,""" start="00:04:44.720" video="mainVideo-emms" id="subtitle"]]
[[!template text="""or even Emms' own native playlist format""" start="00:04:47.440" video="mainVideo-emms" id="subtitle"]]
[[!template text="""which is unsurprisingly a just serialized Emacs Lisp.""" start="00:04:51.120" video="mainVideo-emms" id="subtitle"]]
[[!template text="""No matter how you add tracks to Emms,""" start="00:04:57.200" video="mainVideo-emms" id="subtitle"]]
[[!template text="""you'll end up with a playlist.""" start="00:05:00.200" video="mainVideo-emms" id="subtitle"]]
[[!template text="""A fundamental strength of Emms is that each playlist""" start="00:05:03.880" video="mainVideo-emms" id="subtitle"]]
[[!template text="""is a regular Emacs buffer and the track listing therein""" start="00:05:08.960" video="mainVideo-emms" id="subtitle"]]
[[!template text="""is nothing more than text lines with property overlays.""" start="00:05:13.480" video="mainVideo-emms" id="subtitle"]]
[[!template text="""This means that you can navigate, search, copy,""" start="00:05:17.860" video="mainVideo-emms" id="subtitle"]]
[[!template text="""and edit an Emms playlist buffer""" start="00:05:21.360" video="mainVideo-emms" id="subtitle"]]
[[!template text="""just as you would any Emacs buffer.""" start="00:05:24.880" video="mainVideo-emms" id="subtitle"]]
[[!template text="""If you want to reorganize the tracks in the playlist,""" start="00:05:28.680" video="mainVideo-emms" id="subtitle"]]
[[!template text="""then you can simply kill yank the tracks""" start="00:05:31.320" video="mainVideo-emms" id="subtitle"]]
[[!template text="""just as you would any buffer with lines of text,""" start="00:05:33.960" video="mainVideo-emms" id="subtitle"]]
[[!template text="""and the same can be done between multiple playlist buffers.""" start="00:05:36.760" video="mainVideo-emms" id="subtitle"]]
[[!template text="""One of the most straightforward ways to add media""" start="00:05:42.960" video="mainVideo-emms" id="subtitle"]]
[[!template text="""is to invoke a command like `M-x emms-add-directory-tree`.""" start="00:05:46.120" video="mainVideo-emms" id="subtitle"]]
[[!template text="""You can point it to the top of a set of directories""" start="00:05:51.940" video="mainVideo-emms" id="subtitle"]]
[[!template text="""with playable files for Emms to traverse.""" start="00:05:55.680" video="mainVideo-emms" id="subtitle"]]
[[!template text="""Another rather convenient method is to mark files in Dired""" start="00:06:00.280" video="mainVideo-emms" id="subtitle"]]
[[!template text="""and to invoke `emms-add-dired`.""" start="00:06:05.200" video="mainVideo-emms" id="subtitle"]]
[[!template text="""I definitely use this one a lot.""" start="00:06:09.680" video="mainVideo-emms" id="subtitle"]]
[[!template text="""The Emms playlist mode binds""" start="00:06:11.680" video="mainVideo-emms" id="subtitle"]]
[[!template text="""a number of useful keys and commands.""" start="00:06:16.120" video="mainVideo-emms" id="subtitle"]]
[[!template text="""It's highly recommended that you either""" start="00:06:19.880" video="mainVideo-emms" id="subtitle"]]
[[!template text="""read the friendly manual""" start="00:06:23.960" video="mainVideo-emms" id="subtitle"]]
[[!template text="""or hit &quot;C-h m&quot; in a playlist buffer to discover them.""" start="00:06:25.960" video="mainVideo-emms" id="subtitle"]]
[[!template text="""Now we have a playlist buffer with a number of tracks,""" start="00:06:32.320" video="mainVideo-emms" id="subtitle"]]
[[!template text="""so the next step is going to be playback.""" start="00:06:35.960" video="mainVideo-emms" id="subtitle"]]
[[!template text="""Emms can be used as a minimalistic player""" start="00:06:40.820" video="mainVideo-emms" id="subtitle"]]
[[!template text="""with nothing more than a handful of commands.""" start="00:06:44.400" video="mainVideo-emms" id="subtitle"]]
[[!template text="""Once there is a current Emms playlist,""" start="00:06:48.320" video="mainVideo-emms" id="subtitle"]]
[[!template text="""invoking emms-start will begin playing the current track.""" start="00:06:51.360" video="mainVideo-emms" id="subtitle"]]
[[!template text="""Now of course in a new playlist""" start="00:06:57.560" video="mainVideo-emms" id="subtitle"]]
[[!template text="""that would be the first track.""" start="00:07:00.040" video="mainVideo-emms" id="subtitle"]]
[[!template text="""Now emms-next, emms-pause, and emms-stop""" start="00:07:02.580" video="mainVideo-emms" id="subtitle"]]
[[!template text="""do exactly what you think they do.""" start="00:07:07.200" video="mainVideo-emms" id="subtitle"]]
[[!template text="""To visit the current playlist,""" start="00:07:11.260" video="mainVideo-emms" id="subtitle"]]
[[!template text="""you can invoke M-x emms-playlist-mode-go,""" start="00:07:13.200" video="mainVideo-emms" id="subtitle"]]
[[!template text="""which is a long command I personally bind to &quot;M-f12&quot;.""" start="00:07:17.640" video="mainVideo-emms" id="subtitle"]]
[[!template text="""You'll be taken to the current playlist buffer.""" start="00:07:22.700" video="mainVideo-emms" id="subtitle"]]
[[!template text="""While you can have multiple playlist buffers,""" start="00:07:25.320" video="mainVideo-emms" id="subtitle"]]
[[!template text="""only one is current for the purposes of playback commands.""" start="00:07:29.240" video="mainVideo-emms" id="subtitle"]]
[[!template text="""The playlist buffer has keys bound""" start="00:07:35.780" video="mainVideo-emms" id="subtitle"]]
[[!template text="""to control the media being played.""" start="00:07:38.120" video="mainVideo-emms" id="subtitle"]]
[[!template text="""`emms-seek-forward` and `emms-seek-backwards` allow you""" start="00:07:39.920" video="mainVideo-emms" id="subtitle"]]
[[!template text="""to scrub along the media being played.""" start="00:07:44.200" video="mainVideo-emms" id="subtitle"]]
[[!template text="""Which commands are available is a function of""" start="00:07:49.040" video="mainVideo-emms" id="subtitle"]]
[[!template text="""the player backend being employed.""" start="00:07:51.720" video="mainVideo-emms" id="subtitle"]]
[[!template text="""The simplest of players may have nothing more""" start="00:07:54.200" video="mainVideo-emms" id="subtitle"]]
[[!template text="""than the ability to play, stop, and seek,""" start="00:07:56.600" video="mainVideo-emms" id="subtitle"]]
[[!template text="""but others may implement a plethora of commands.""" start="00:07:59.560" video="mainVideo-emms" id="subtitle"]]

The modeline

[[!template new="1" text="""The Modeline: Emms will by default display""" start="00:08:04.240" video="mainVideo-emms" id="subtitle"]]
[[!template text="""the name of the currently playing track in the mode line""" start="00:08:08.880" video="mainVideo-emms" id="subtitle"]]
[[!template text="""with information such as playing time.""" start="00:08:11.840" video="mainVideo-emms" id="subtitle"]]
[[!template text="""The mode line format is controlled""" start="00:08:15.000" video="mainVideo-emms" id="subtitle"]]
[[!template text="""via the `emms-mode-line-format` variable""" start="00:08:15.560" video="mainVideo-emms" id="subtitle"]]
[[!template text="""and the `emms-mode-line-playlist-current` function.""" start="00:08:20.640" video="mainVideo-emms" id="subtitle"]]
[[!template text="""Metadata and the cache.""" start="00:08:27.140" video="mainVideo-emms" id="subtitle"]]
[[!template text="""It would be sufficient for emms to simply list""" start="00:08:31.040" video="mainVideo-emms" id="subtitle"]]
[[!template text="""the file names or urls of each piece of media,""" start="00:08:34.800" video="mainVideo-emms" id="subtitle"]]
[[!template text="""but unless you name your music and media""" start="00:08:38.620" video="mainVideo-emms" id="subtitle"]]
[[!template text="""with obsessive consistency and precision,""" start="00:08:41.000" video="mainVideo-emms" id="subtitle"]]
[[!template text="""not that there is anything wrong with that""" start="00:08:43.940" video="mainVideo-emms" id="subtitle"]]
[[!template text="""then the resulting list will be a bit of an eyesore.""" start="00:08:46.680" video="mainVideo-emms" id="subtitle"]]
[[!template text="""Moreover, there are a lot of other useful metadata""" start="00:08:50.860" video="mainVideo-emms" id="subtitle"]]
[[!template text="""in the media files, including cool stuff like album art.""" start="00:08:54.120" video="mainVideo-emms" id="subtitle"]]
[[!template text="""So instead of just files, Emms will try""" start="00:08:58.620" video="mainVideo-emms" id="subtitle"]]
[[!template text="""to extract metadata from each track""" start="00:09:01.920" video="mainVideo-emms" id="subtitle"]]
[[!template text="""and display a nicely-formatted track listing.""" start="00:09:04.400" video="mainVideo-emms" id="subtitle"]]
[[!template text="""The format can be controlled by customizing""" start="00:09:08.220" video="mainVideo-emms" id="subtitle"]]
[[!template text="""the variable `emms-track-description-function`.""" start="00:09:10.800" video="mainVideo-emms" id="subtitle"]]
[[!template text="""Emms uses so-called info methods to extract""" start="00:09:15.460" video="mainVideo-emms" id="subtitle"]]
[[!template text="""the metadata from each file.""" start="00:09:19.640" video="mainVideo-emms" id="subtitle"]]
[[!template text="""`emms-info-native`, which I mentioned before,""" start="00:09:22.440" video="mainVideo-emms" id="subtitle"]]
[[!template text="""is the built-in metadata reader written in Emacs Lisp.""" start="00:09:25.680" video="mainVideo-emms" id="subtitle"]]
[[!template text="""It provides support for Ogg Vorbis, Ogg Opus, FLAC, and MP3.""" start="00:09:30.360" video="mainVideo-emms" id="subtitle"]]
[[!template text="""However, if you have media in other formats,""" start="00:09:37.660" video="mainVideo-emms" id="subtitle"]]
[[!template text="""you can also add info methods""" start="00:09:40.360" video="mainVideo-emms" id="subtitle"]]
[[!template text="""to the `emms-info-functions` list,""" start="00:09:42.440" video="mainVideo-emms" id="subtitle"]]
[[!template text="""which call external programs such as exiftool,""" start="00:09:45.240" video="mainVideo-emms" id="subtitle"]]
[[!template text="""the LibTag library, tiny-tag, etc. to read file metadata.""" start="00:09:48.700" video="mainVideo-emms" id="subtitle"]]
[[!template text="""Since reading metadata takes time""" start="00:09:55.420" video="mainVideo-emms" id="subtitle"]]
[[!template text="""and that metadata doesn't change very often,""" start="00:09:58.200" video="mainVideo-emms" id="subtitle"]]
[[!template text="""Emms builds a cache as it extracts""" start="00:10:01.340" video="mainVideo-emms" id="subtitle"]]
[[!template text="""the information from each file.""" start="00:10:04.080" video="mainVideo-emms" id="subtitle"]]
[[!template text="""The first time loading of thousands of tracks""" start="00:10:06.860" video="mainVideo-emms" id="subtitle"]]
[[!template text="""into the emms cache may take a while,""" start="00:10:09.880" video="mainVideo-emms" id="subtitle"]]
[[!template text="""but as is the nature of caching, subsequent loads""" start="00:10:13.260" video="mainVideo-emms" id="subtitle"]]
[[!template text="""will be nearly instantaneous.""" start="00:10:17.000" video="mainVideo-emms" id="subtitle"]]
[[!template text="""To ease loading huge media collections,""" start="00:10:20.060" video="mainVideo-emms" id="subtitle"]]
[[!template text="""emms also can populate the cache asynchronously,""" start="00:10:22.720" video="mainVideo-emms" id="subtitle"]]
[[!template text="""so that your emacs isn't locked up in the interim.""" start="00:10:26.520" video="mainVideo-emms" id="subtitle"]]
[[!template text="""Let's talk about streams and URLs.""" start="00:10:30.520" video="mainVideo-emms" id="subtitle"]]
[[!template text="""Not all playlist entries need to be associated with files.""" start="00:10:33.780" video="mainVideo-emms" id="subtitle"]]
[[!template text="""It's possible to add streaming playlists""" start="00:10:37.620" video="mainVideo-emms" id="subtitle"]]
[[!template text="""and URLs to any playlist.""" start="00:10:39.840" video="mainVideo-emms" id="subtitle"]]
[[!template text="""Emms also comes with a built-in eclectic list""" start="00:10:42.640" video="mainVideo-emms" id="subtitle"]]
[[!template text="""of streaming audio stations to get you started.""" start="00:10:46.120" video="mainVideo-emms" id="subtitle"]]
[[!template text="""Any playlist entry can be a URL,""" start="00:10:50.040" video="mainVideo-emms" id="subtitle"]]
[[!template text="""and that URL will be passed on to the media player backend,""" start="00:10:52.640" video="mainVideo-emms" id="subtitle"]]
[[!template text="""which can play it, if any.""" start="00:10:56.720" video="mainVideo-emms" id="subtitle"]]

Meta-playlist mode

[[!template new="1" text="""Meta-playlist mode:""" start="00:11:01.200" video="mainVideo-emms" id="subtitle"]]
[[!template text="""Emms also has meta-playlist mode""" start="00:11:03.680" video="mainVideo-emms" id="subtitle"]]
[[!template text="""to help manage multiple playlists.""" start="00:11:08.300" video="mainVideo-emms" id="subtitle"]]
[[!template text="""When you invoke meta-playlist mode,""" start="00:11:11.960" video="mainVideo-emms" id="subtitle"]]
[[!template text="""you will see a listing of all of the current Emms playlists,""" start="00:11:13.880" video="mainVideo-emms" id="subtitle"]]
[[!template text="""and this mode binds a handful of useful keybindings""" start="00:11:16.960" video="mainVideo-emms" id="subtitle"]]
[[!template text="""to help manage those playlists.""" start="00:11:22.000" video="mainVideo-emms" id="subtitle"]]

The browser

[[!template new="1" text="""The Browser:""" start="00:11:29.860" video="mainVideo-emms" id="subtitle"]]
[[!template text="""Music doesn't always lend itself to being viewed""" start="00:11:31.760" video="mainVideo-emms" id="subtitle"]]
[[!template text="""as a series of discrete files.""" start="00:11:35.440" video="mainVideo-emms" id="subtitle"]]
[[!template text="""While there may be a good taxonomy of music""" start="00:11:38.200" video="mainVideo-emms" id="subtitle"]]
[[!template text="""that can be reflected using directories and filenames,""" start="00:11:41.560" video="mainVideo-emms" id="subtitle"]]
[[!template text="""there are other aspects which cannot.""" start="00:11:45.460" video="mainVideo-emms" id="subtitle"]]
[[!template text="""This is especially true when you consider that""" start="00:11:49.100" video="mainVideo-emms" id="subtitle"]]
[[!template text="""unlike many computer file taxonomies,""" start="00:11:51.600" video="mainVideo-emms" id="subtitle"]]
[[!template text="""music files may contain""" start="00:11:55.300" video="mainVideo-emms" id="subtitle"]]
[[!template text="""a lot of self-descriptive information""" start="00:11:56.720" video="mainVideo-emms" id="subtitle"]]
[[!template text="""in the form of metadata,""" start="00:11:58.760" video="mainVideo-emms" id="subtitle"]]
[[!template text="""such as the year a work was published, the composer,""" start="00:12:00.620" video="mainVideo-emms" id="subtitle"]]
[[!template text="""the performing artist, etc.""" start="00:12:04.280" video="mainVideo-emms" id="subtitle"]]
[[!template text="""Therefore, it makes sense for Emms to enable""" start="00:12:07.520" video="mainVideo-emms" id="subtitle"]]
[[!template text="""a different view into a media collection""" start="00:12:11.080" video="mainVideo-emms" id="subtitle"]]
[[!template text="""which is based on the cached metadata.""" start="00:12:13.200" video="mainVideo-emms" id="subtitle"]]
[[!template text="""The browser interface binds a host of keys""" start="00:12:17.060" video="mainVideo-emms" id="subtitle"]]
[[!template text="""to help navigate the tree structure""" start="00:12:19.840" video="mainVideo-emms" id="subtitle"]]
[[!template text="""of the metadata information.""" start="00:12:22.080" video="mainVideo-emms" id="subtitle"]]
[[!template text="""Since browser display""" start="00:12:24.540" video="mainVideo-emms" id="subtitle"]]
[[!template text="""is not predicated upon directory structure,""" start="00:12:25.840" video="mainVideo-emms" id="subtitle"]]
[[!template text="""you can invoke functions such as `emms-browse-by-album`,""" start="00:12:28.280" video="mainVideo-emms" id="subtitle"]]
[[!template text="""or `emms-browse-by-artist`, etc.""" start="00:12:32.940" video="mainVideo-emms" id="subtitle"]]
[[!template text="""to view the collection in different ways.""" start="00:12:35.640" video="mainVideo-emms" id="subtitle"]]
[[!template text="""Emms can do a lot more,""" start="00:12:42.180" video="mainVideo-emms" id="subtitle"]]
[[!template text="""but covering it all would take too much time.""" start="00:12:43.760" video="mainVideo-emms" id="subtitle"]]
[[!template text="""I do recommend opening the fine Emms manual""" start="00:12:47.020" video="mainVideo-emms" id="subtitle"]]
[[!template text="""and getting to know some additional features""" start="00:12:50.240" video="mainVideo-emms" id="subtitle"]]
[[!template text="""such as sorting tracks in playlists,""" start="00:12:52.320" video="mainVideo-emms" id="subtitle"]]
[[!template text="""sorting and filtering in the browser,""" start="00:12:55.000" video="mainVideo-emms" id="subtitle"]]
[[!template text="""editing track information,""" start="00:12:57.200" video="mainVideo-emms" id="subtitle"]]
[[!template text="""deriving a new playlist from an existing playlist,""" start="00:12:59.080" video="mainVideo-emms" id="subtitle"]]
[[!template text="""the music player daemon, lyrics display, volume control,""" start="00:13:01.920" video="mainVideo-emms" id="subtitle"]]
[[!template text="""bookmarks, GNU FM, and Dbus/Mpris support.""" start="00:13:07.040" video="mainVideo-emms" id="subtitle"]]
[[!template text="""I hope this was a useful introduction to Emms.""" start="00:13:13.360" video="mainVideo-emms" id="subtitle"]]

How Emms works: The technical part

[[!template new="1" text="""How Emms Works: The technical part:""" start="00:13:19.920" video="mainVideo-emms" id="subtitle"]]
[[!template text="""This part is an overview of how Emms works.""" start="00:13:23.220" video="mainVideo-emms" id="subtitle"]]
[[!template text="""By the end of this, you should be familiar enough""" start="00:13:26.820" video="mainVideo-emms" id="subtitle"]]
[[!template text="""with Emms internals to hack on it. Hint hint.""" start="00:13:29.760" video="mainVideo-emms" id="subtitle"]]
[[!template text="""A short history of Emms""" start="00:13:34.740" video="mainVideo-emms" id="subtitle"]]
[[!template text="""Emms is 20 years old as of the time of writing.""" start="00:13:37.680" video="mainVideo-emms" id="subtitle"]]
[[!template text="""Old enough to drink in many countries.""" start="00:13:42.940" video="mainVideo-emms" id="subtitle"]]
[[!template text="""This means it was developed back in 2003""" start="00:13:45.400" video="mainVideo-emms" id="subtitle"]]
[[!template text="""for emacs 21.2 or thereabouts.""" start="00:13:48.880" video="mainVideo-emms" id="subtitle"]]
[[!template text="""As developers, we don't go around looking to""" start="00:13:53.440" video="mainVideo-emms" id="subtitle"]]
[[!template text="""replace code just because it's old.""" start="00:13:56.280" video="mainVideo-emms" id="subtitle"]]
[[!template text="""On the other hand, some parts were inadequate""" start="00:13:58.840" video="mainVideo-emms" id="subtitle"]]
[[!template text="""or just didn't age gracefully.""" start="00:14:01.840" video="mainVideo-emms" id="subtitle"]]
[[!template text="""And we have been partially or completely rewriting those.""" start="00:14:04.920" video="mainVideo-emms" id="subtitle"]]
[[!template text="""I became the maintainer of Emms about a decade ago,""" start="00:14:10.360" video="mainVideo-emms" id="subtitle"]]
[[!template text="""but I didn't start the project.""" start="00:14:13.720" video="mainVideo-emms" id="subtitle"]]
[[!template text="""Jorgen Schäfer started the project.""" start="00:14:16.100" video="mainVideo-emms" id="subtitle"]]
[[!template text="""I reached out to Jorgen""" start="00:14:21.020" video="mainVideo-emms" id="subtitle"]]
[[!template text="""and he kindly shared some of his recollections.""" start="00:14:22.520" video="mainVideo-emms" id="subtitle"]]
[[!template text="""Jorgen states that Emms was born back""" start="00:14:25.620" video="mainVideo-emms" id="subtitle"]]
[[!template text="""when the music format wars raged.""" start="00:14:28.200" video="mainVideo-emms" id="subtitle"]]
[[!template text="""MP3 was the standard, but overshadowed with patent issues.""" start="00:14:31.280" video="mainVideo-emms" id="subtitle"]]
[[!template text="""In fact, Technicolor and Fraunhofer IIS""" start="00:14:38.700" video="mainVideo-emms" id="subtitle"]]
[[!template text="""only stopped licensing their patents for MP3""" start="00:14:42.480" video="mainVideo-emms" id="subtitle"]]
[[!template text="""as recently as April of 2017.""" start="00:14:45.560" video="mainVideo-emms" id="subtitle"]]
[[!template text="""Jorgen said that, and I quote,""" start="00:14:49.360" video="mainVideo-emms" id="subtitle"]]
[[!template text="""&quot;I needed a tool that was player agnostic""" start="00:14:53.540" video="mainVideo-emms" id="subtitle"]]
[[!template text="""and that could deal with a large collection of music files.""" start="00:14:56.080" video="mainVideo-emms" id="subtitle"]]
[[!template text="""And I did not want any of the GUI music players""" start="00:14:59.440" video="mainVideo-emms" id="subtitle"]]
[[!template text="""that existed back then.""" start="00:15:02.800" video="mainVideo-emms" id="subtitle"]]
[[!template text="""Primarily, actually, because I did not want""" start="00:15:04.040" video="mainVideo-emms" id="subtitle"]]
[[!template text="""to be switching windows to skip to the next song.""" start="00:15:07.520" video="mainVideo-emms" id="subtitle"]]
[[!template text="""If I remember correctly,""" start="00:15:11.400" video="mainVideo-emms" id="subtitle"]]
[[!template text="""I had just a shell script before that.""" start="00:15:12.880" video="mainVideo-emms" id="subtitle"]]
[[!template text="""But I figured I lived in Emacs, so why not write a tool""" start="00:15:16.280" video="mainVideo-emms" id="subtitle"]]
[[!template text="""that I can control my music from Emacs""" start="00:15:20.160" video="mainVideo-emms" id="subtitle"]]
[[!template text="""without ever having to leave Emacs?&quot; Unquote.""" start="00:15:23.040" video="mainVideo-emms" id="subtitle"]]
[[!template text="""We can see that Jorgen's motivations were of the best kind,""" start="00:15:27.760" video="mainVideo-emms" id="subtitle"]]
[[!template text="""to stay in Emacs.""" start="00:15:32.120" video="mainVideo-emms" id="subtitle"]]
[[!template text="""Emms, an architecture of sensible abstractions.""" start="00:15:35.320" video="mainVideo-emms" id="subtitle"]]
[[!template text="""Emms can be divided into a number of parts.""" start="00:15:40.680" video="mainVideo-emms" id="subtitle"]]
[[!template text="""The core, tracks, playlists, sources, players,""" start="00:15:44.040" video="mainVideo-emms" id="subtitle"]]
[[!template text="""info, cache, and ancillary.""" start="00:15:48.120" video="mainVideo-emms" id="subtitle"]]
[[!template text="""Now David J. Wheeler once said""" start="00:15:51.760" video="mainVideo-emms" id="subtitle"]]
[[!template text="""that all problems in computer science""" start="00:15:53.680" video="mainVideo-emms" id="subtitle"]]
[[!template text="""can be solved by another level of indirection,""" start="00:15:56.000" video="mainVideo-emms" id="subtitle"]]
[[!template text="""except of course for the problem""" start="00:15:59.800" video="mainVideo-emms" id="subtitle"]]
[[!template text="""of too many layers of indirection.""" start="00:16:01.640" video="mainVideo-emms" id="subtitle"]]
[[!template text="""Emms core has survived this long""" start="00:16:04.420" video="mainVideo-emms" id="subtitle"]]
[[!template text="""because it makes sensible and flexible coding abstractions.""" start="00:16:07.000" video="mainVideo-emms" id="subtitle"]]
[[!template text="""Keep this in mind as we explore the implementation.""" start="00:16:11.620" video="mainVideo-emms" id="subtitle"]]
[[!template text="""This following part of the talk will also be invaluable""" start="00:16:15.500" video="mainVideo-emms" id="subtitle"]]
[[!template text="""if you want to hack on Emacs.""" start="00:16:18.880" video="mainVideo-emms" id="subtitle"]]
[[!template text="""Another hint.""" start="00:16:21.560" video="mainVideo-emms" id="subtitle"]]

The Emms core

[[!template new="1" text="""The Emms core.""" start="00:16:23.820" video="mainVideo-emms" id="subtitle"]]
[[!template text="""The core defines tracks, playlists,""" start="00:16:25.360" video="mainVideo-emms" id="subtitle"]]
[[!template text="""a way to start and stop playback,""" start="00:16:29.080" video="mainVideo-emms" id="subtitle"]]
[[!template text="""as well as ways to proceed to the next track.""" start="00:16:31.760" video="mainVideo-emms" id="subtitle"]]

Tracks

[[!template new="1" text="""Tracks:""" start="00:16:36.440" video="mainVideo-emms" id="subtitle"]]
[[!template text="""Emms tracks consist of a list whose CAR is the symbol track,""" start="00:16:38.460" video="mainVideo-emms" id="subtitle"]]
[[!template text="""and CADR is an alist starting with""" start="00:16:44.780" video="mainVideo-emms" id="subtitle"]]
[[!template text="""the association of `type'.""" start="00:16:47.080" video="mainVideo-emms" id="subtitle"]]
[[!template text="""Type can be something like file, streamlist, URL, etc.""" start="00:16:50.640" video="mainVideo-emms" id="subtitle"]]
[[!template text="""A track of classical music from Bach's Art of Fugue""" start="00:16:56.740" video="mainVideo-emms" id="subtitle"]]
[[!template text="""may look something like this.""" start="00:17:00.080" video="mainVideo-emms" id="subtitle"]]
[[!template text="""While a track may contain many associations,""" start="00:17:04.380" video="mainVideo-emms" id="subtitle"]]
[[!template text="""the number of associations remains a small constant""" start="00:17:07.600" video="mainVideo-emms" id="subtitle"]]
[[!template text="""from the perspective of computational steps required""" start="00:17:11.080" video="mainVideo-emms" id="subtitle"]]
[[!template text="""to find any particular association.""" start="00:17:14.200" video="mainVideo-emms" id="subtitle"]]

Playlist

[[!template new="1" text="""Playlist:""" start="00:17:18.460" video="mainVideo-emms" id="subtitle"]]
[[!template text="""An Emms playlist consists of an Emacs buffer""" start="00:17:20.620" video="mainVideo-emms" id="subtitle"]]
[[!template text="""with a buffer-local non-nil variable,""" start="00:17:23.480" video="mainVideo-emms" id="subtitle"]]
[[!template text="""`emms-playlist-buffer-p`.""" start="00:17:26.460" video="mainVideo-emms" id="subtitle"]]
[[!template text="""The buffer can contain anything, any amount or type of text,""" start="00:17:29.820" video="mainVideo-emms" id="subtitle"]]
[[!template text="""or anything else.""" start="00:17:33.720" video="mainVideo-emms" id="subtitle"]]
[[!template text="""Emms tracks are stored in text properties within the buffer,""" start="00:17:35.960" video="mainVideo-emms" id="subtitle"]]
[[!template text="""with the unimaginatively named text property `emms-track`.""" start="00:17:40.500" video="mainVideo-emms" id="subtitle"]]
[[!template text="""For Emms, to go to the next track consists of""" start="00:17:46.400" video="mainVideo-emms" id="subtitle"]]
[[!template text="""nothing more than looking for the next text property change""" start="00:17:49.240" video="mainVideo-emms" id="subtitle"]]
[[!template text="""containing `emms-track`, wherever that is.""" start="00:17:52.840" video="mainVideo-emms" id="subtitle"]]
[[!template text="""That means that there is a healthy decoupling between""" start="00:17:57.180" video="mainVideo-emms" id="subtitle"]]
[[!template text="""the visual representation of a playlist""" start="00:18:00.540" video="mainVideo-emms" id="subtitle"]]
[[!template text="""and its contents as far as Emms is concerned.""" start="00:18:03.840" video="mainVideo-emms" id="subtitle"]]
[[!template text="""This decoupling allows Emms playlist buffers""" start="00:18:08.260" video="mainVideo-emms" id="subtitle"]]
[[!template text="""to look like anything as long as that anything consists of""" start="00:18:11.600" video="mainVideo-emms" id="subtitle"]]
[[!template text="""one or more `emms-track` text properties.""" start="00:18:15.320" video="mainVideo-emms" id="subtitle"]]

Sources

[[!template new="1" text="""Sources:""" start="00:18:22.080" video="mainVideo-emms" id="subtitle"]]
[[!template text="""A source is how you tell Emms:""" start="00:18:23.580" video="mainVideo-emms" id="subtitle"]]
[[!template text="""&quot;Go and get those things and turn them into tracks.&quot;""" start="00:18:25.840" video="mainVideo-emms" id="subtitle"]]
[[!template text="""More specifically, an Emms source is a function called in""" start="00:18:29.780" video="mainVideo-emms" id="subtitle"]]
[[!template text="""a playlist buffer in order to add tracks.""" start="00:18:34.480" video="mainVideo-emms" id="subtitle"]]
[[!template text="""And even more specifically, a source is really""" start="00:18:37.260" video="mainVideo-emms" id="subtitle"]]
[[!template text="""a family of related functions""" start="00:18:40.200" video="mainVideo-emms" id="subtitle"]]
[[!template text="""defined by the macro `define-emms-source`.""" start="00:18:42.680" video="mainVideo-emms" id="subtitle"]]
[[!template text="""A straightforward example""" start="00:18:47.680" video="mainVideo-emms" id="subtitle"]]
[[!template text="""is the function `emms-add-directory`,""" start="00:18:49.960" video="mainVideo-emms" id="subtitle"]]
[[!template text="""which adds an entire directory of files""" start="00:18:52.960" video="mainVideo-emms" id="subtitle"]]
[[!template text="""to the current playlist.""" start="00:18:55.880" video="mainVideo-emms" id="subtitle"]]
[[!template text="""It accepts, or interactively queries for, a directory""" start="00:18:57.440" video="mainVideo-emms" id="subtitle"]]
[[!template text="""and iterates over each file in that directory,""" start="00:19:02.320" video="mainVideo-emms" id="subtitle"]]
[[!template text="""adding them as tracks to the playlist buffer as it goes.""" start="00:19:06.120" video="mainVideo-emms" id="subtitle"]]
[[!template text="""Emms comes with sources for files, directories, URLs,""" start="00:19:10.760" video="mainVideo-emms" id="subtitle"]]
[[!template text="""playlists of various formats,""" start="00:19:15.040" video="mainVideo-emms" id="subtitle"]]
[[!template text="""files from dired mode, and etc.""" start="00:19:17.320" video="mainVideo-emms" id="subtitle"]]

Players

[[!template new="1" text="""Players:""" start="00:19:22.160" video="mainVideo-emms" id="subtitle"]]
[[!template text="""An Emms player is, at its simplest, a data structure""" start="00:19:24.880" video="mainVideo-emms" id="subtitle"]]
[[!template text="""with three functions.""" start="00:19:28.960" video="mainVideo-emms" id="subtitle"]]
[[!template text="""One to start playing, one to stop,""" start="00:19:30.840" video="mainVideo-emms" id="subtitle"]]
[[!template text="""and one which returns true if the player knows""" start="00:19:34.520" video="mainVideo-emms" id="subtitle"]]
[[!template text="""how to play a given track.""" start="00:19:38.180" video="mainVideo-emms" id="subtitle"]]
[[!template text="""However, if your player also knows how to pause, resume,""" start="00:19:41.280" video="mainVideo-emms" id="subtitle"]]
[[!template text="""seek, etc, then additional functions can be added""" start="00:19:44.760" video="mainVideo-emms" id="subtitle"]]
[[!template text="""to the player data structure.""" start="00:19:48.280" video="mainVideo-emms" id="subtitle"]]
[[!template text="""This is abstract enough to be able to, for example,""" start="00:19:51.320" video="mainVideo-emms" id="subtitle"]]
[[!template text="""define a simple player for images with the help of""" start="00:19:55.400" video="mainVideo-emms" id="subtitle"]]
[[!template text="""the `define-emms-simple-player` macro.""" start="00:19:58.840" video="mainVideo-emms" id="subtitle"]]
[[!template text="""The above will define a player called `emms-player-display`,""" start="00:20:04.580" video="mainVideo-emms" id="subtitle"]]
[[!template text="""which would call ImageMagick's `display` command""" start="00:20:09.560" video="mainVideo-emms" id="subtitle"]]
[[!template text="""on each file in our playlist""" start="00:20:12.960" video="mainVideo-emms" id="subtitle"]]
[[!template text="""with the image file extension we listed.""" start="00:20:15.640" video="mainVideo-emms" id="subtitle"]]

Info

[[!template new="1" text="""Info:""" start="00:20:20.520" video="mainVideo-emms" id="subtitle"]]
[[!template text="""As previously described, Emms comes with info methods,""" start="00:20:23.060" video="mainVideo-emms" id="subtitle"]]
[[!template text="""which are functions to add""" start="00:20:28.020" video="mainVideo-emms" id="subtitle"]]
[[!template text="""descriptive information to tracks.""" start="00:20:29.640" video="mainVideo-emms" id="subtitle"]]
[[!template text="""Emms is set up so that""" start="00:20:32.340" video="mainVideo-emms" id="subtitle"]]
[[!template text="""the hook `emms-track-initialize-functions` is called""" start="00:20:34.640" video="mainVideo-emms" id="subtitle"]]
[[!template text="""when a track is created, and that ends up calling""" start="00:20:37.720" video="mainVideo-emms" id="subtitle"]]
[[!template text="""the info methods listed in the `emms-info-functions` list.""" start="00:20:41.640" video="mainVideo-emms" id="subtitle"]]
[[!template text="""These will modify the track data structure to add metadata.""" start="00:20:46.280" video="mainVideo-emms" id="subtitle"]]
[[!template text="""One of the coolest recent features of Emms""" start="00:20:51.200" video="mainVideo-emms" id="subtitle"]]
[[!template text="""is `emms-info-native`, written by Petteri Hintsanen;""" start="00:20:54.320" video="mainVideo-emms" id="subtitle"]]
[[!template text="""again, sorry for the pronunciation.""" start="00:20:58.700" video="mainVideo-emms" id="subtitle"]]
[[!template text="""`emms-info-native` is a purely Emacs Lisp implementation""" start="00:21:01.326" video="mainVideo-emms" id="subtitle"]]
[[!template text="""which reads Ogg Vorbis, Ogg Opus, FLAC, and MP3 files""" start="00:21:06.520" video="mainVideo-emms" id="subtitle"]]
[[!template text="""and parses out the metadata.""" start="00:21:11.440" video="mainVideo-emms" id="subtitle"]]
[[!template text="""This is in comparison with other info readers""" start="00:21:14.680" video="mainVideo-emms" id="subtitle"]]
[[!template text="""which Emms supports, which all involve calling out""" start="00:21:17.520" video="mainVideo-emms" id="subtitle"]]
[[!template text="""to external processes and parsing the values returned.""" start="00:21:20.560" video="mainVideo-emms" id="subtitle"]]
[[!template text="""`emms-info-native` works by unpacking and examining""" start="00:21:25.620" video="mainVideo-emms" id="subtitle"]]
[[!template text="""the binary data in the media file headers""" start="00:21:29.320" video="mainVideo-emms" id="subtitle"]]
[[!template text="""and parsing the data layout specifications.""" start="00:21:32.040" video="mainVideo-emms" id="subtitle"]]

The cache

[[!template new="1" text="""The Cache:""" start="00:21:36.660" video="mainVideo-emms" id="subtitle"]]
[[!template text="""The Emms cache is a mapping between a full path name""" start="00:21:38.880" video="mainVideo-emms" id="subtitle"]]
[[!template text="""and its associated information.""" start="00:21:43.280" video="mainVideo-emms" id="subtitle"]]
[[!template text="""Once information is extracted from a file""" start="00:21:45.720" video="mainVideo-emms" id="subtitle"]]
[[!template text="""using an info method, that information is then""" start="00:21:48.200" video="mainVideo-emms" id="subtitle"]]
[[!template text="""associated with that file in the cache.""" start="00:21:50.760" video="mainVideo-emms" id="subtitle"]]
[[!template text="""One thing to bear in mind is that the caching system""" start="00:21:53.980" video="mainVideo-emms" id="subtitle"]]
[[!template text="""was originally written back""" start="00:21:57.160" video="mainVideo-emms" id="subtitle"]]
[[!template text="""when slow spinning disks were common.""" start="00:21:58.360" video="mainVideo-emms" id="subtitle"]]
[[!template text="""A 32GB SSD drive cost close to $700 in 2006,""" start="00:22:00.760" video="mainVideo-emms" id="subtitle"]]
[[!template text="""which is the equivalent of about $1,000""" start="00:22:07.520" video="mainVideo-emms" id="subtitle"]]
[[!template text="""at the time of writing.""" start="00:22:10.280" video="mainVideo-emms" id="subtitle"]]
[[!template text="""But despite the speed of modern drives,""" start="00:22:12.440" video="mainVideo-emms" id="subtitle"]]
[[!template text="""the caching system is still worth using""" start="00:22:15.260" video="mainVideo-emms" id="subtitle"]]
[[!template text="""for larger music collections.""" start="00:22:17.440" video="mainVideo-emms" id="subtitle"]]
[[!template text="""The caching system is also a prerequisite""" start="00:22:19.680" video="mainVideo-emms" id="subtitle"]]
[[!template text="""for being able to use the Emms browser.""" start="00:22:22.440" video="mainVideo-emms" id="subtitle"]]
[[!template text="""The cache implementation is relatively naive.""" start="00:22:26.600" video="mainVideo-emms" id="subtitle"]]
[[!template text="""For instance, moving a file will invalidate""" start="00:22:30.380" video="mainVideo-emms" id="subtitle"]]
[[!template text="""that cache entry for that file""" start="00:22:33.200" video="mainVideo-emms" id="subtitle"]]
[[!template text="""and will require a refresh.""" start="00:22:35.800" video="mainVideo-emms" id="subtitle"]]
[[!template text="""However, relatively little work has been done""" start="00:22:37.580" video="mainVideo-emms" id="subtitle"]]
[[!template text="""to the cache implementation over the years""" start="00:22:40.600" video="mainVideo-emms" id="subtitle"]]
[[!template text="""since it has proven to be good enough""" start="00:22:42.780" video="mainVideo-emms" id="subtitle"]]
[[!template text="""for the majority of situations.""" start="00:22:45.000" video="mainVideo-emms" id="subtitle"]]
[[!template text="""Which is to say, nobody complained.""" start="00:22:47.060" video="mainVideo-emms" id="subtitle"]]

Healthy back and forth: mpv, mpd, and GNU.FM

[[!template new="1" text="""Healthy back and forth. MPV, MPD, GNU.FM""" start="00:22:51.620" video="mainVideo-emms" id="subtitle"]]
[[!template text="""Process communication with a simple media player""" start="00:22:56.240" video="mainVideo-emms" id="subtitle"]]
[[!template text="""can be as straightforward""" start="00:23:00.120" video="mainVideo-emms" id="subtitle"]]
[[!template text="""as starting an asynchronous process""" start="00:23:01.760" video="mainVideo-emms" id="subtitle"]]
[[!template text="""and waiting for that process to complete""" start="00:23:03.800" video="mainVideo-emms" id="subtitle"]]
[[!template text="""in order to move to the next track.""" start="00:23:05.800" video="mainVideo-emms" id="subtitle"]]
[[!template text="""This is how the example above""" start="00:23:08.620" video="mainVideo-emms" id="subtitle"]]
[[!template text="""with ImageMagick's display binary worked.""" start="00:23:10.880" video="mainVideo-emms" id="subtitle"]]
[[!template text="""However, Emms also handles asynchronous""" start="00:23:13.760" video="mainVideo-emms" id="subtitle"]]
[[!template text="""two-way communication with processes.""" start="00:23:17.440" video="mainVideo-emms" id="subtitle"]]
[[!template text="""A simple example of this would be sending strings""" start="00:23:20.300" video="mainVideo-emms" id="subtitle"]]
[[!template text="""to a running process such as the pause command to VLC.""" start="00:23:23.960" video="mainVideo-emms" id="subtitle"]]

MPV

[[!template new="1" text="""MPV:""" start="00:23:31.560" video="mainVideo-emms" id="subtitle"]]
[[!template text="""MPV is a popular media player forked""" start="00:23:33.380" video="mainVideo-emms" id="subtitle"]]
[[!template text="""in a roundabout way from mplayer.""" start="00:23:37.040" video="mainVideo-emms" id="subtitle"]]
[[!template text="""One of its most notable features is""" start="00:23:39.900" video="mainVideo-emms" id="subtitle"]]
[[!template text="""support for a robust client API.""" start="00:23:42.080" video="mainVideo-emms" id="subtitle"]]
[[!template text="""Mike Kazantsev has been working since 2018""" start="00:23:46.600" video="mainVideo-emms" id="subtitle"]]
[[!template text="""to develop the excellent `emms-player-mpv.el'.""" start="00:23:52.960" video="mainVideo-emms" id="subtitle"]]
[[!template text="""It can communicate with a long running MPV process""" start="00:23:58.350" video="mainVideo-emms" id="subtitle"]]
[[!template text="""via Unix sockets or IP sockets.""" start="00:24:02.000" video="mainVideo-emms" id="subtitle"]]
[[!template text="""This allows for MPV to do things""" start="00:24:07.180" video="mainVideo-emms" id="subtitle"]]
[[!template text="""like update ICY metadata for streaming audio.""" start="00:24:11.170" video="mainVideo-emms" id="subtitle"]]
[[!template text="""So that, for example, when a song changes""" start="00:24:14.890" video="mainVideo-emms" id="subtitle"]]
[[!template text="""while you're listening to a streaming audio via Emms,""" start="00:24:17.640" video="mainVideo-emms" id="subtitle"]]
[[!template text="""the song title displayed in the mode line""" start="00:24:22.050" video="mainVideo-emms" id="subtitle"]]
[[!template text="""and track listing can update as well.""" start="00:24:24.680" video="mainVideo-emms" id="subtitle"]]
[[!template text="""This means that deep inside the code""" start="00:24:28.330" video="mainVideo-emms" id="subtitle"]]
[[!template text="""there is an Emacs `make-network-process` call.""" start="00:24:30.400" video="mainVideo-emms" id="subtitle"]]
[[!template text="""The fact that Mike has put this together""" start="00:24:35.630" video="mainVideo-emms" id="subtitle"]]
[[!template text="""in fewer than 1,000 lines of legible Emacs Lisp""" start="00:24:37.920" video="mainVideo-emms" id="subtitle"]]
[[!template text="""is a testament to some serious coding ability.""" start="00:24:42.640" video="mainVideo-emms" id="subtitle"]]

MPD

[[!template new="1" text="""MPD:""" start="00:24:47.470" video="mainVideo-emms" id="subtitle"]]
[[!template text="""Similar to MPV but potentially""" start="00:24:49.610" video="mainVideo-emms" id="subtitle"]]
[[!template text="""on a completely different machine""" start="00:24:52.400" video="mainVideo-emms" id="subtitle"]]
[[!template text="""is Emms support for the Music Player Daemon.""" start="00:24:54.120" video="mainVideo-emms" id="subtitle"]]
[[!template text="""Music Player Daemon or MPD is a media player""" start="00:24:58.460" video="mainVideo-emms" id="subtitle"]]
[[!template text="""with an explicit client-server design""" start="00:25:01.520" video="mainVideo-emms" id="subtitle"]]
[[!template text="""and communicates with Emms via a network process.""" start="00:25:03.960" video="mainVideo-emms" id="subtitle"]]
[[!template text="""Unfortunately, MPD support has never been all that great.""" start="00:25:09.950" video="mainVideo-emms" id="subtitle"]]
[[!template text="""But this isn't the emms developers fault!""" start="00:25:16.090" video="mainVideo-emms" id="subtitle"]]
[[!template text="""Because unlike every other media player""" start="00:25:20.470" video="mainVideo-emms" id="subtitle"]]
[[!template text="""that Emms interfaces with MPD is designed around""" start="00:25:25.600" video="mainVideo-emms" id="subtitle"]]
[[!template text="""its own internal playlist database.""" start="00:25:29.730" video="mainVideo-emms" id="subtitle"]]
[[!template text="""This is a surprising design decision""" start="00:25:31.930" video="mainVideo-emms" id="subtitle"]]
[[!template text="""on the MPD developers' part""" start="00:25:35.270" video="mainVideo-emms" id="subtitle"]]
[[!template text="""since it goes against the client-server mindset.""" start="00:25:37.650" video="mainVideo-emms" id="subtitle"]]
[[!template text="""A consequence is that we end up having to try and coordinate""" start="00:25:41.750" video="mainVideo-emms" id="subtitle"]]
[[!template text="""and harmonize the MPD playlist with the Emms playlist.""" start="00:25:45.960" video="mainVideo-emms" id="subtitle"]]
[[!template text="""I can foresee writing a completely new MPD mode for Emms""" start="00:25:51.400" video="mainVideo-emms" id="subtitle"]]
[[!template text="""which is designed to be a true pure MPD client.""" start="00:25:56.690" video="mainVideo-emms" id="subtitle"]]
[[!template text="""Unless of course someone volunteers to beat me to it.""" start="00:26:01.510" video="mainVideo-emms" id="subtitle"]]
[[!template text="""Hint hint.""" start="00:26:05.340" video="mainVideo-emms" id="subtitle"]]

GNU FM and Libre FM

[[!template new="1" text="""GNU FM and Libre FM:""" start="00:26:07.440" video="mainVideo-emms" id="subtitle"]]
[[!template text="""Libre FM is a music community which allows you""" start="00:26:10.960" video="mainVideo-emms" id="subtitle"]]
[[!template text="""to share your listening habits with other users of the site.""" start="00:26:13.640" video="mainVideo-emms" id="subtitle"]]
[[!template text="""A kind of online listening party.""" start="00:26:17.450" video="mainVideo-emms" id="subtitle"]]
[[!template text="""In the case of `emms-librefm-scrobber.el`""" start="00:26:21.270" video="mainVideo-emms" id="subtitle"]]
[[!template text="""we use Emacs' `url-retrieve` function""" start="00:26:25.650" video="mainVideo-emms" id="subtitle"]]
[[!template text="""to asynchronously send to a URL""" start="00:26:28.640" video="mainVideo-emms" id="subtitle"]]
[[!template text="""and then fire a callback function to process the response.""" start="00:26:32.450" video="mainVideo-emms" id="subtitle"]]
[[!template text="""This represents numerous challenges""" start="00:26:40.050" video="mainVideo-emms" id="subtitle"]]
[[!template text="""to implement within Emacs.""" start="00:26:42.680" video="mainVideo-emms" id="subtitle"]]
[[!template text="""The primary issue being that Emacs itself""" start="00:26:45.090" video="mainVideo-emms" id="subtitle"]]
[[!template text="""is pretty weak at doing anything""" start="00:26:47.400" video="mainVideo-emms" id="subtitle"]]
[[!template text="""truly and really asynchronously.""" start="00:26:50.100" video="mainVideo-emms" id="subtitle"]]
[[!template text="""I can say with confident sarcasm""" start="00:26:54.220" video="mainVideo-emms" id="subtitle"]]
[[!template text="""and with tongue firmly planted in cheek""" start="00:26:56.400" video="mainVideo-emms" id="subtitle"]]
[[!template text="""that it is almost as if the original designers""" start="00:26:59.530" video="mainVideo-emms" id="subtitle"]]
[[!template text="""of Emacs didn't foresee their text editor""" start="00:27:02.880" video="mainVideo-emms" id="subtitle"]]
[[!template text="""needing to play music""" start="00:27:05.840" video="mainVideo-emms" id="subtitle"]]
[[!template text="""while interacting with a remote network server.""" start="00:27:07.040" video="mainVideo-emms" id="subtitle"]]
[[!template text="""How myopic!""" start="00:27:09.820" video="mainVideo-emms" id="subtitle"]]

How we work: Emms development

[[!template new="1" text="""How we work: Emms development:""" start="00:27:12.560" video="mainVideo-emms" id="subtitle"]]
[[!template text="""This part is an overview of how Emms is developed.""" start="00:27:15.700" video="mainVideo-emms" id="subtitle"]]
[[!template text="""By the end of this part you should be able to understand""" start="00:27:19.620" video="mainVideo-emms" id="subtitle"]]
[[!template text="""how we hacked this project, and how you can too.""" start="00:27:23.900" video="mainVideo-emms" id="subtitle"]]
[[!template text="""Where it's at.""" start="00:27:28.720" video="mainVideo-emms" id="subtitle"]]
[[!template text="""How to find our forge.""" start="00:27:29.950" video="mainVideo-emms" id="subtitle"]]
[[!template text="""Emms has been hosted at the FSF's forge, Savannah,""" start="00:27:32.370" video="mainVideo-emms" id="subtitle"]]
[[!template text="""since around 2003.""" start="00:27:36.500" video="mainVideo-emms" id="subtitle"]]
[[!template text="""Emms is distributed via GNU ELPA and integrated into Emacs.""" start="00:27:39.840" video="mainVideo-emms" id="subtitle"]]
[[!template text="""Before ELPA it was distributed as a tarball""" start="00:27:46.230" video="mainVideo-emms" id="subtitle"]]
[[!template text="""via ftp.gnu.org but that stopped back in 2020.""" start="00:27:49.800" video="mainVideo-emms" id="subtitle"]]
[[!template text="""I was initially resistant to ELPA but around the time""" start="00:27:55.140" video="mainVideo-emms" id="subtitle"]]
[[!template text="""when the thousandth person asked me why Emms isn't on ELPA,""" start="00:27:58.720" video="mainVideo-emms" id="subtitle"]]
[[!template text="""I realized that it had to happen.""" start="00:28:03.850" video="mainVideo-emms" id="subtitle"]]
[[!template text="""Emms can also be found in other places""" start="00:28:07.210" video="mainVideo-emms" id="subtitle"]]
[[!template text="""such as Melpa or GitHub but we, the developers of Emms,""" start="00:28:10.600" video="mainVideo-emms" id="subtitle"]]
[[!template text="""have nothing to do with that""" start="00:28:16.080" video="mainVideo-emms" id="subtitle"]]
[[!template text="""and we don't monitor those channels.""" start="00:28:18.000" video="mainVideo-emms" id="subtitle"]]
[[!template text="""If you want the source straight from, well, the source,""" start="00:28:21.760" video="mainVideo-emms" id="subtitle"]]
[[!template text="""then go to the Savannah Git repository.""" start="00:28:26.300" video="mainVideo-emms" id="subtitle"]]
[[!template text="""Look who's talking: Where development discussion happens.""" start="00:28:30.370" video="mainVideo-emms" id="subtitle"]]
[[!template text="""If you want to talk to us, discussions all happen""" start="00:28:34.990" video="mainVideo-emms" id="subtitle"]]
[[!template text="""on emms-help@gnu.org.""" start="00:28:38.000" video="mainVideo-emms" id="subtitle"]]
[[!template text="""We used to use emms-patches@gnu.org""" start="00:28:41.430" video="mainVideo-emms" id="subtitle"]]
[[!template text="""but didn't feel like the volume of incoming patches""" start="00:28:45.560" video="mainVideo-emms" id="subtitle"]]
[[!template text="""justified a separate mailing list.""" start="00:28:48.280" video="mainVideo-emms" id="subtitle"]]

The Rime Of The Ancient Maintainer

[[!template new="1" text="""The Rime Of The Ancient Maintainer:""" start="00:28:52.590" video="mainVideo-emms" id="subtitle"]]
[[!template text="""There are a number of activities""" start="00:28:55.720" video="mainVideo-emms" id="subtitle"]]
[[!template text="""particular to being a maintainer.""" start="00:28:57.480" video="mainVideo-emms" id="subtitle"]]
[[!template text="""These are all part of a project's lifecycle.""" start="00:29:00.100" video="mainVideo-emms" id="subtitle"]]
[[!template text="""Let's review some of them.""" start="00:29:03.390" video="mainVideo-emms" id="subtitle"]]

The life and times of an Emms patch

[[!template new="1" text="""The life and times of an Emms patch:""" start="00:29:06.080" video="mainVideo-emms" id="subtitle"]]
[[!template text="""A maintainer needs to be able to accept, critique,""" start="00:29:10.000" video="mainVideo-emms" id="subtitle"]]
[[!template text="""and integrate patches from contributors and developers.""" start="00:29:13.240" video="mainVideo-emms" id="subtitle"]]
[[!template text="""This means, among other things, that the maintainer""" start="00:29:17.560" video="mainVideo-emms" id="subtitle"]]
[[!template text="""needs to keep on top of copyright issues.""" start="00:29:20.560" video="mainVideo-emms" id="subtitle"]]
[[!template text="""Before being able to add Emms to GNU/ELPA,""" start="00:29:24.470" video="mainVideo-emms" id="subtitle"]]
[[!template text="""we had to make sure that the copyright situation""" start="00:29:29.360" video="mainVideo-emms" id="subtitle"]]
[[!template text="""was in order.""" start="00:29:31.880" video="mainVideo-emms" id="subtitle"]]
[[!template text="""This long process required reaching out to people""" start="00:29:33.850" video="mainVideo-emms" id="subtitle"]]
[[!template text="""and having them assign the copyright""" start="00:29:37.520" video="mainVideo-emms" id="subtitle"]]
[[!template text="""for their work to the FSF,""" start="00:29:39.960" video="mainVideo-emms" id="subtitle"]]
[[!template text="""or even removing their code entirely""" start="00:29:42.510" video="mainVideo-emms" id="subtitle"]]
[[!template text="""if they couldn't be reached.""" start="00:29:45.200" video="mainVideo-emms" id="subtitle"]]
[[!template text="""The experience left me with the conviction""" start="00:29:47.970" video="mainVideo-emms" id="subtitle"]]
[[!template text="""that the easiest way to fix""" start="00:29:50.630" video="mainVideo-emms" id="subtitle"]]
[[!template text="""the copyright situation of your package""" start="00:29:52.400" video="mainVideo-emms" id="subtitle"]]
[[!template text="""is to ensure that it never gets broken in the first place.""" start="00:29:54.520" video="mainVideo-emms" id="subtitle"]]
[[!template text="""Often a person will write in to the emms-help mailing list,""" start="00:30:00.640" video="mainVideo-emms" id="subtitle"]]
[[!template text="""or perhaps raise an issue on IRC.""" start="00:30:04.440" video="mainVideo-emms" id="subtitle"]]
[[!template text="""If it's a bug report or feature request, we'll discuss it,""" start="00:30:08.030" video="mainVideo-emms" id="subtitle"]]
[[!template text="""and when it's fixed, we'll ask the reporter""" start="00:30:11.680" video="mainVideo-emms" id="subtitle"]]
[[!template text="""to test the result and provide feedback.""" start="00:30:14.160" video="mainVideo-emms" id="subtitle"]]
[[!template text="""If it's a patch, then we'll typically go one of three ways.""" start="00:30:17.640" video="mainVideo-emms" id="subtitle"]]
[[!template text="""A trivial patch, such as fixing a typo""" start="00:30:22.040" video="mainVideo-emms" id="subtitle"]]
[[!template text="""or corrections on a single line of code,""" start="00:30:24.800" video="mainVideo-emms" id="subtitle"]]
[[!template text="""will simply be applied by one of the developers.""" start="00:30:27.280" video="mainVideo-emms" id="subtitle"]]
[[!template text="""A non-trivial, but one-time patch,""" start="00:30:32.040" video="mainVideo-emms" id="subtitle"]]
[[!template text="""will have to be cleared from a copyright perspective.""" start="00:30:34.520" video="mainVideo-emms" id="subtitle"]]
[[!template text="""This means assigning copyright for the changes to the FSF.""" start="00:30:37.990" video="mainVideo-emms" id="subtitle"]]
[[!template text="""Once that's cleared, then the patch will be applied.""" start="00:30:42.420" video="mainVideo-emms" id="subtitle"]]
[[!template text="""Finally, if it's a non-trivial patch,""" start="00:30:46.320" video="mainVideo-emms" id="subtitle"]]
[[!template text="""which looks like it would be the start""" start="00:30:49.880" video="mainVideo-emms" id="subtitle"]]
[[!template text="""of a long-term development work (my favorite),""" start="00:30:52.080" video="mainVideo-emms" id="subtitle"]]
[[!template text="""then after copyright is cleared,""" start="00:30:56.010" video="mainVideo-emms" id="subtitle"]]
[[!template text="""that person will be offered to be added""" start="00:30:57.880" video="mainVideo-emms" id="subtitle"]]
[[!template text="""to the members with Git repo access on Savannah.""" start="00:31:00.800" video="mainVideo-emms" id="subtitle"]]
[[!template text="""From there, we usually use a dedicated branch""" start="00:31:05.020" video="mainVideo-emms" id="subtitle"]]
[[!template text="""to do all the playing around""" start="00:31:08.200" video="mainVideo-emms" id="subtitle"]]
[[!template text="""before merging it with the main Git repo.""" start="00:31:09.640" video="mainVideo-emms" id="subtitle"]]
[[!template text="""If you have ever sent a patch, feature request,""" start="00:31:13.630" video="mainVideo-emms" id="subtitle"]]
[[!template text="""or bug report into Emms (small or large), we thank you.""" start="00:31:16.880" video="mainVideo-emms" id="subtitle"]]

Let It Go: The release process

[[!template new="1" text="""Let It Go, The Release Process:""" start="00:31:24.080" video="mainVideo-emms" id="subtitle"]]
[[!template text="""The maintainer is responsible for the release process.""" start="00:31:27.790" video="mainVideo-emms" id="subtitle"]]
[[!template text="""I found that a consistent schedule works well,""" start="00:31:31.610" video="mainVideo-emms" id="subtitle"]]
[[!template text="""which is not to say that we have to release on schedule,""" start="00:31:35.130" video="mainVideo-emms" id="subtitle"]]
[[!template text="""but that aiming for a consistent release schedule""" start="00:31:39.380" video="mainVideo-emms" id="subtitle"]]
[[!template text="""provides structure and a goal.""" start="00:31:42.760" video="mainVideo-emms" id="subtitle"]]
[[!template text="""The main Git branch in the repository is stable""" start="00:31:46.050" video="mainVideo-emms" id="subtitle"]]
[[!template text="""and more often than not of release quality.""" start="00:31:50.160" video="mainVideo-emms" id="subtitle"]]
[[!template text="""Releases are done about every three months.""" start="00:31:53.240" video="mainVideo-emms" id="subtitle"]]
[[!template text="""And with such a stable main branch,""" start="00:31:56.650" video="mainVideo-emms" id="subtitle"]]
[[!template text="""the process of releasing often involves little more""" start="00:31:59.000" video="mainVideo-emms" id="subtitle"]]
[[!template text="""than writing a NEWS entry.""" start="00:32:02.320" video="mainVideo-emms" id="subtitle"]]
[[!template text="""As a consequence, new and wonderful features""" start="00:32:05.060" video="mainVideo-emms" id="subtitle"]]
[[!template text="""which aren't quite ready for prime time""" start="00:32:08.440" video="mainVideo-emms" id="subtitle"]]
[[!template text="""when a release comes around,""" start="00:32:11.440" video="mainVideo-emms" id="subtitle"]]
[[!template text="""will remain safely in their branch on the Git repo""" start="00:32:13.500" video="mainVideo-emms" id="subtitle"]]
[[!template text="""until after the ELPA release.""" start="00:32:18.200" video="mainVideo-emms" id="subtitle"]]

It Is Not In Our Stars, But In Ourselves: Future directions

[[!template new="1" text="""It Is Not In Our Stars, But In Ourselves; Future Directions:""" start="00:32:23.400" video="mainVideo-emms" id="subtitle"]]
[[!template text="""One aspect of Emms that needs to improve is ease of setup.""" start="00:32:29.630" video="mainVideo-emms" id="subtitle"]]
[[!template text="""Now that might surprise you, since at the time of writing,""" start="00:32:34.900" video="mainVideo-emms" id="subtitle"]]
[[!template text="""it's already pretty easy.""" start="00:32:37.720" video="mainVideo-emms" id="subtitle"]]
[[!template text="""But my ideal is that the user would need to do""" start="00:32:40.070" video="mainVideo-emms" id="subtitle"]]
[[!template text="""nothing at all after installation.""" start="00:32:43.880" video="mainVideo-emms" id="subtitle"]]
[[!template text="""And with that, as a goal in mind,""" start="00:32:46.840" video="mainVideo-emms" id="subtitle"]]
[[!template text="""there is more work to be done.""" start="00:32:49.360" video="mainVideo-emms" id="subtitle"]]
[[!template text="""We are working on a player discovery feature.""" start="00:32:52.750" video="mainVideo-emms" id="subtitle"]]
[[!template text="""The idea is simple.""" start="00:32:55.500" video="mainVideo-emms" id="subtitle"]]
[[!template text="""The code looks for binaries of popular media players""" start="00:32:57.040" video="mainVideo-emms" id="subtitle"]]
[[!template text="""on the user's machine,""" start="00:33:00.080" video="mainVideo-emms" id="subtitle"]]
[[!template text="""and for each one found, it asks the user""" start="00:33:01.640" video="mainVideo-emms" id="subtitle"]]
[[!template text="""if they want the associated Emms player backend""" start="00:33:04.520" video="mainVideo-emms" id="subtitle"]]
[[!template text="""to be configured.""" start="00:33:07.520" video="mainVideo-emms" id="subtitle"]]
[[!template text="""In effect, this code is already working,""" start="00:33:09.810" video="mainVideo-emms" id="subtitle"]]
[[!template text="""but currently an undocumented, unofficial feature.""" start="00:33:12.590" video="mainVideo-emms" id="subtitle"]]
[[!template text="""You can try it for yourself with""" start="00:33:16.290" video="mainVideo-emms" id="subtitle"]]
[[!template text="""`emms-setup-discover-players`.""" start="00:33:17.720" video="mainVideo-emms" id="subtitle"]]
[[!template text="""So what's the holdup?""" start="00:33:21.080" video="mainVideo-emms" id="subtitle"]]
[[!template text="""`emms-setup-discover-players` currently configures""" start="00:33:22.970" video="mainVideo-emms" id="subtitle"]]
[[!template text="""the `emms-player-list` variable,""" start="00:33:26.040" video="mainVideo-emms" id="subtitle"]]
[[!template text="""but doesn't write it to disk.""" start="00:33:27.840" video="mainVideo-emms" id="subtitle"]]
[[!template text="""And that means that the configuration""" start="00:33:29.900" video="mainVideo-emms" id="subtitle"]]
[[!template text="""isn't preserved between Emacs sessions.""" start="00:33:31.680" video="mainVideo-emms" id="subtitle"]]
[[!template text="""The question then becomes,""" start="00:33:35.040" video="mainVideo-emms" id="subtitle"]]
[[!template text="""what is the best way to preserve this setting?""" start="00:33:36.900" video="mainVideo-emms" id="subtitle"]]
[[!template text="""I personally don't like anything""" start="00:33:40.310" video="mainVideo-emms" id="subtitle"]]
[[!template text="""to edit my .emacs except me,""" start="00:33:42.600" video="mainVideo-emms" id="subtitle"]]
[[!template text="""and I wouldn't do that to anyone else.""" start="00:33:46.200" video="mainVideo-emms" id="subtitle"]]
[[!template text="""Now we already write state to the .emacs.d/emms/ directory,""" start="00:33:49.280" video="mainVideo-emms" id="subtitle"]]
[[!template text="""but that would require care not to""" start="00:33:55.960" video="mainVideo-emms" id="subtitle"]]
[[!template text="""clobber a user's existing setup.""" start="00:33:58.360" video="mainVideo-emms" id="subtitle"]]
[[!template text="""Having the user set up their system in one place,""" start="00:34:01.910" video="mainVideo-emms" id="subtitle"]]
[[!template text="""such as a .emacs or a .emmsrc,""" start="00:34:04.720" video="mainVideo-emms" id="subtitle"]]
[[!template text="""while saving state to a different place""" start="00:34:08.840" video="mainVideo-emms" id="subtitle"]]
[[!template text="""is asking for confusion.""" start="00:34:11.420" video="mainVideo-emms" id="subtitle"]]
[[!template text="""This is a good example which I bring up""" start="00:34:14.210" video="mainVideo-emms" id="subtitle"]]
[[!template text="""of where a maintainer needs to""" start="00:34:16.720" video="mainVideo-emms" id="subtitle"]]
[[!template text="""solicit opinions from developers,""" start="00:34:18.400" video="mainVideo-emms" id="subtitle"]]
[[!template text="""both the Emacs developers,""" start="00:34:21.309" video="mainVideo-emms" id="subtitle"]]
[[!template text="""asking them where packages should save state,""" start="00:34:23.900" video="mainVideo-emms" id="subtitle"]]
[[!template text="""and the Emms developers, and also users.""" start="00:34:28.170" video="mainVideo-emms" id="subtitle"]]
[[!template text="""Then, the maintainer needs to""" start="00:34:33.170" video="mainVideo-emms" id="subtitle"]]
[[!template text="""carefully choose a path forward.""" start="00:34:35.440" video="mainVideo-emms" id="subtitle"]]
[[!template text="""It is typical of the kind of issue you have to have in mind""" start="00:34:38.020" video="mainVideo-emms" id="subtitle"]]
[[!template text="""when you're maintaining a package.""" start="00:34:41.560" video="mainVideo-emms" id="subtitle"]]

Development policies: Interface language

[[!template new="1" text="""Development Policies: Interface Language.""" start="00:34:44.849" video="mainVideo-emms" id="subtitle"]]
[[!template text="""A maintainer of an interactive program such as Emms""" start="00:34:49.160" video="mainVideo-emms" id="subtitle"]]
[[!template text="""needs to think about user interaction.""" start="00:34:52.360" video="mainVideo-emms" id="subtitle"]]
[[!template text="""Emms doesn't use key bindings which are familiar""" start="00:34:55.360" video="mainVideo-emms" id="subtitle"]]
[[!template text="""to people who are used to GUI media players,""" start="00:34:58.400" video="mainVideo-emms" id="subtitle"]]
[[!template text="""and that can, and has, caused friction.""" start="00:35:02.720" video="mainVideo-emms" id="subtitle"]]
[[!template text="""Some new users are confused when they press the spacebar""" start="00:35:06.560" video="mainVideo-emms" id="subtitle"]]
[[!template text="""on an entry in the Emms browser,""" start="00:35:09.960" video="mainVideo-emms" id="subtitle"]]
[[!template text="""only to find that nothing starts playing.""" start="00:35:12.530" video="mainVideo-emms" id="subtitle"]]
[[!template text="""Indeed, all that does is to expand the browser tree""" start="00:35:15.460" video="mainVideo-emms" id="subtitle"]]
[[!template text="""at that point.""" start="00:35:18.680" video="mainVideo-emms" id="subtitle"]]
[[!template text="""Then they might press RET on the same entry,""" start="00:35:20.470" video="mainVideo-emms" id="subtitle"]]
[[!template text="""and be further frustrated at the continuing silence.""" start="00:35:23.000" video="mainVideo-emms" id="subtitle"]]
[[!template text="""Since what return does is just to add that entry at point""" start="00:35:28.260" video="mainVideo-emms" id="subtitle"]]
[[!template text="""to the current playlist.""" start="00:35:33.400" video="mainVideo-emms" id="subtitle"]]
[[!template text="""The discussion then arises""" start="00:35:36.170" video="mainVideo-emms" id="subtitle"]]
[[!template text="""about how Emms should handle that situation.""" start="00:35:37.760" video="mainVideo-emms" id="subtitle"]]
[[!template text="""On one hand, we want to make it as easy as possible""" start="00:35:41.820" video="mainVideo-emms" id="subtitle"]]
[[!template text="""for new users to learn Emms,""" start="00:35:45.560" video="mainVideo-emms" id="subtitle"]]
[[!template text="""and adopt a do-what-I-mean interface approach.""" start="00:35:48.820" video="mainVideo-emms" id="subtitle"]]
[[!template text="""On the other hand, this is an Emacs project.""" start="00:35:52.760" video="mainVideo-emms" id="subtitle"]]
[[!template text="""It isn't a stand-alone GUI media player,""" start="00:35:56.750" video="mainVideo-emms" id="subtitle"]]
[[!template text="""and should integrate into Emacs,""" start="00:35:59.440" video="mainVideo-emms" id="subtitle"]]
[[!template text="""and serve Emacs users first and foremost.""" start="00:36:01.400" video="mainVideo-emms" id="subtitle"]]

Development policies: Freedom

[[!template new="1" text="""Development policies: Freedom.""" start="00:36:05.980" video="mainVideo-emms" id="subtitle"]]
[[!template text="""Another maintainer job is to think of Emms' posture""" start="00:36:10.290" video="mainVideo-emms" id="subtitle"]]
[[!template text="""in regards to software freedom.""" start="00:36:15.000" video="mainVideo-emms" id="subtitle"]]
[[!template text="""Here are a few examples.""" start="00:36:17.380" video="mainVideo-emms" id="subtitle"]]
[[!template text="""Back with MP3 was still a patent encumbered format,""" start="00:36:19.730" video="mainVideo-emms" id="subtitle"]]
[[!template text="""we pushed hard for Vorbis everywhere""" start="00:36:23.760" video="mainVideo-emms" id="subtitle"]]
[[!template text="""along with the PlayOgg campaign.""" start="00:36:26.081" video="mainVideo-emms" id="subtitle"]]
[[!template text="""A then popular music streaming service,""" start="00:36:29.640" video="mainVideo-emms" id="subtitle"]]
[[!template text="""which will remain unnamed,""" start="00:36:32.700" video="mainVideo-emms" id="subtitle"]]
[[!template text="""changed their stance towards third-party applications,""" start="00:36:34.930" video="mainVideo-emms" id="subtitle"]]
[[!template text="""and required individual API keys which could not be shared.""" start="00:36:38.620" video="mainVideo-emms" id="subtitle"]]
[[!template text="""We stood firm, said &quot;no&quot;,""" start="00:36:43.130" video="mainVideo-emms" id="subtitle"]]
[[!template text="""and removed support for that service.""" start="00:36:45.400" video="mainVideo-emms" id="subtitle"]]
[[!template text="""A recent suggestion to add support for YouTube""" start="00:36:48.670" video="mainVideo-emms" id="subtitle"]]
[[!template text="""was also nixed,""" start="00:36:51.360" video="mainVideo-emms" id="subtitle"]]
[[!template text="""because the particular backend""" start="00:36:53.890" video="mainVideo-emms" id="subtitle"]]
[[!template text="""was found to download and run proprietary javascript""" start="00:36:55.680" video="mainVideo-emms" id="subtitle"]]
[[!template text="""on the user's machine.""" start="00:36:58.960" video="mainVideo-emms" id="subtitle"]]
[[!template text="""Saying no to potentially useful or wanted features""" start="00:37:01.850" video="mainVideo-emms" id="subtitle"]]
[[!template text="""because it involves non-free software""" start="00:37:05.400" video="mainVideo-emms" id="subtitle"]]
[[!template text="""is often an unpopular decision and can alienate people.""" start="00:37:07.920" video="mainVideo-emms" id="subtitle"]]
[[!template text="""A maintainer needs to think carefully""" start="00:37:13.490" video="mainVideo-emms" id="subtitle"]]
[[!template text="""about each of these decisions,""" start="00:37:15.560" video="mainVideo-emms" id="subtitle"]]
[[!template text="""as they are rarely straightforward and one-sided.""" start="00:37:17.400" video="mainVideo-emms" id="subtitle"]]
[[!template text="""And as you see above, they also change over time""" start="00:37:21.920" video="mainVideo-emms" id="subtitle"]]
[[!template text="""and need to be re-evaluated.""" start="00:37:25.840" video="mainVideo-emms" id="subtitle"]]
[[!template text="""One of the most useful things a maintainer can do""" start="00:37:30.300" video="mainVideo-emms" id="subtitle"]]
[[!template text="""is to coordinate the development effort""" start="00:37:33.000" video="mainVideo-emms" id="subtitle"]]
[[!template text="""and help new people join the project.""" start="00:37:35.520" video="mainVideo-emms" id="subtitle"]]
[[!template text="""In light of that, if you want to work on a project""" start="00:37:39.230" video="mainVideo-emms" id="subtitle"]]
[[!template text="""which has a bit of everything,""" start="00:37:41.840" video="mainVideo-emms" id="subtitle"]]
[[!template text="""you could do worse than hacking on Emms.""" start="00:37:44.060" video="mainVideo-emms" id="subtitle"]]
[[!template text="""There is inter-process communication,""" start="00:37:47.810" video="mainVideo-emms" id="subtitle"]]
[[!template text="""displaying graphics, parsing binary files,""" start="00:37:49.720" video="mainVideo-emms" id="subtitle"]]
[[!template text="""caching, asynchronous processes, user interface design.""" start="00:37:52.480" video="mainVideo-emms" id="subtitle"]]
[[!template text="""We also are a project that insists on""" start="00:37:56.530" video="mainVideo-emms" id="subtitle"]]
[[!template text="""keeping a well-written and up-to-date manual.""" start="00:37:59.600" video="mainVideo-emms" id="subtitle"]]
[[!template text="""If you can write English or hack Emacs Lisp at all,""" start="00:38:02.960" video="mainVideo-emms" id="subtitle"]]
[[!template text="""chances are that there is something you can do for Emms.""" start="00:38:06.760" video="mainVideo-emms" id="subtitle"]]
[[!template text="""Just saying.""" start="00:38:09.940" video="mainVideo-emms" id="subtitle"]]

Acknowledgements

[[!template new="1" text="""Acknowledgements:""" start="00:38:12.370" video="mainVideo-emms" id="subtitle"]]
[[!template text="""I'd like to express my deep gratitude for all of the people""" start="00:38:14.190" video="mainVideo-emms" id="subtitle"]]
[[!template text="""who have hacked on Emms""" start="00:38:18.080" video="mainVideo-emms" id="subtitle"]]
[[!template text="""during my time as a maintainer and before it.""" start="00:38:19.560" video="mainVideo-emms" id="subtitle"]]
[[!template text="""It is often the case that I'm just the person""" start="00:38:23.170" video="mainVideo-emms" id="subtitle"]]
[[!template text="""holding the rudder and steering the ship,""" start="00:38:25.760" video="mainVideo-emms" id="subtitle"]]
[[!template text="""with all of these developers""" start="00:38:28.560" video="mainVideo-emms" id="subtitle"]]
[[!template text="""rowing furiously to provide the power""" start="00:38:30.040" video="mainVideo-emms" id="subtitle"]]
[[!template text="""which actually moves the ship forward.""" start="00:38:33.180" video="mainVideo-emms" id="subtitle"]]
[[!template text="""Thank you to all.""" start="00:38:36.370" video="mainVideo-emms" id="subtitle"]]



Captioner: yoni

Questions or comments? Please e-mail [emacsconf-org-private@gnu.org](mailto:emacsconf-org-private@gnu.org?subject=Comment%20for%20EmacsConf%202023%20emms%3A%20Emacs%20MultiMedia%20System%20%28EMMS%29)


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