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+[[!toc levels=4]]
+
+
+# Tasks
+
+
+## Manually transcribe
+
+Either subtitles (with timestamps) or a text transcript (no timestamps) is perfectly okay.
+
+
+### TODO mplsCorwin: emacsconf-2020–03-idea-to-novel-superstructure-emacs-for-writing–questions–bala-ramadurai.webm
+
+
+### TODO mplsCorwin: emacsconf-2020–08-building-reproducible-emacs–andrew-tropin.webm
+
+
+### DONE sachac: emacsconf-2020–10-lead-your-future-with-org–andrea.webm
+
+Added transcript to info/10.md, seeing if YouTube can automatically
+assign timing. Took about 24 minutes to transcribe 8 minute talk. If
+it doesn't work out, I might manually time it.
+
+… It worked!
+
+
+### TODO zaeph: emacsconf-2020–24-analyze-code-quality-through-emacs-a-smart-forensics-approach-and-the-story-of-a-hack–andrea.webm
+
+
+## Edit automatic subtitles
+
+No need to worry about end timestamps, since I'll set them to the
+beginning timestamp. To reduce duplication of work, make sure you have the latest copy of organizers-notebook.org. Mark the one you
+want to do by prepending your name to the TODO title, and commit
+organizers-notebook.org back to the repo.
+
+
+### TODO <./subtitles/emacsconf-2020--00-opening-remarks-autogen.sbv>
+
+
+### DONE sachac <./subtitles/emacsconf-2020--03-idea-to-novel-superstructure-emacs-for-writing--bala-ramadurai-autogen.sbv>
+
+See <info/03/screenplay.fountain>
+
+
+### DONE sachac <./subtitles/emacsconf-2020--04-music-in-plain-text--jonathan-gregory-autogen.sbv>
+
+
+### DONE sachac <./subtitles/emacsconf-2020--05-bard-bivoumacs-building-a-bandcamp-like-page-for-an-album-of-music--grant-shangreaux-autogen.sbv>
+
+
+### DONE sachac <./subtitles/emacsconf-2020--05-bard-bivoumacs-building-a-bandcamp-like-page-for-an-album-of-music--questions--grant-shangreaux-autogen.sbv>
+
+
+### TODO sachac <./subtitles/emacsconf-2020--07-beyond-vim-and-emacs-a-scalable-ui-paradigm--questions--sid-kasivajhula-autogen.sbv>
+
+
+### TODO <./subtitles/emacsconf-2020--07-beyond-vim-and-emacs-a-scalable-ui-paradigm--sid-kasivajhula-autogen.sbv>
+
+
+### TODO <./subtitles/emacsconf-2020--09-orgmode-your-life-in-plain-text--rainer-koenig-autogen.sbv>
+
+
+### TODO <./subtitles/emacsconf-2020--11-the-org-gtd-package-opinions-about-getting-things-done--aldric-autogen.sbv>
+
+
+### TODO <./subtitles/emacsconf-2020--12-one-big-ass-org-file-or-multiple-tiny-ones-finally-the-end-of-the-debate--leo-vivier-autogen.sbv>
+
+
+### TODO <./subtitles/emacsconf-2020--13-experience-report-steps-to-emacs-hyper-notebooks--joseph-corneli-raymond-puzio-cameron-ray-smith-autogen.sbv>
+
+
+### TODO <./subtitles/emacsconf-2020--14-readme-driven-design--adam-ard-autogen.sbv>
+
+
+### TODO <./subtitles/emacsconf-2020--15-moving-from-jekyll-to-orgmode-an-experience-report--adolfo-villafiorita-autogen.sbv>
+
+
+### TODO <./subtitles/emacsconf-2020--16-org-roam-presentation-demonstration-and-whats-on-the-horizon--leo-vivier-autogen.sbv>
+
+
+### TODO <./subtitles/emacsconf-2020--17-org-mode-and-org-roam-for-scholars-and-researchers--noorah-alhasan-autogen.sbv>
+
+
+### TODO <./subtitles/emacsconf-2020--18-org-roam-technical-presentation--leo-vivier-autogen.sbv>
+
+
+### TODO <./subtitles/emacsconf-2020--19-sharing-blogs-and-more-with-org-webring--brett-gilio-autogen.sbv>
+
+
+### TODO <./subtitles/emacsconf-2020--20-omg-macros--corwin-brust-autogen.sbv>
+
+
+### TODO <./subtitles/emacsconf-2020--21-on-why-most-of-the-best-features-in-eev-look-like-5-minute-hacks--eduardo-ochs-autogen.sbv>
+
+
+### TODO <./subtitles/emacsconf-2020--22-powering-up-special-blocks--musa-al-hassy-autogen.sbv>
+
+
+### TODO <./subtitles/emacsconf-2020--23-incremental-parsing-with-emacs-tree-sitter--questions--tuan-anh-nguyen-autogen.sbv>
+
+
+### TODO <./subtitles/emacsconf-2020--23-incremental-parsing-with-emacs-tree-sitter--tuan-anh-nguyen-autogen.sbv>
+
+
+### TODO <./subtitles/emacsconf-2020--25-traverse-complex-json-structures-with-live-feedback-counsel-jq--zen-monk-alain-m-lafon-autogen.sbv>
+
+
+### TODO <./subtitles/emacsconf-2020--26-emacs-as-a-highschooler-how-it-changed-my-life--pierce-wang-autogen.sbv>
+
+
+### TODO <./subtitles/emacsconf-2020--26-emacs-as-a-highschooler-how-it-changed-my-life--questions--pierce-wang-autogen.sbv>
+
+
+### TODO <./subtitles/emacsconf-2020--27-state-of-retro-gaming-in-emacs-chip8--vasilij-wasamasa-schneidermann-autogen.sbv>
+
+
+### TODO <./subtitles/emacsconf-2020--28-welcome-to-the-dungeon--erik-elmshauser-corwin-brust-autogen.sbv>
+
+
+### TODO <./subtitles/emacsconf-2020--30-a-tour-of-vterm--gabriele-bozzola-sbozzolo-autogen.sbv>
+
+
+### TODO <./subtitles/emacsconf-2020--30-a-tour-of-vterm--questions--gabriele-bozzola-sbozzolo-autogen.sbv>
+
+
+### TODO <./subtitles/emacsconf-2020--31-lakota-language-and-emacs--grant-shangreaux-autogen.sbv>
+
+
+### TODO <./subtitles/emacsconf-2020--31-lakota-language-and-emacs--questions--grant-shangreaux-autogen.sbv>
+
+
+### TODO <./subtitles/emacsconf-2020--32-object-oriented-code-in-the-gnus-newsreader--eric-abrahamsen-autogen.sbv>
+
+
+### TODO <./subtitles/emacsconf-2020--33-maxima-a-computer-algebra-system-in-emacs--fermin.sbv>
+
+
+### TODO <./subtitles/emacsconf-2020--34-extend-emacs-to-modern-gui-applications-with-eaf--matthew-zeng-autogen.sbv>
+
+
+### TODO <./subtitles/emacsconf-2020--35-waveing-at-repetitive-repetitive-repetitive-music-zmusic--questions--zachary-kanfer-autogen.sbv>
+
+
+### TODO <./subtitles/emacsconf-2020--38-emacs-development-update--john-wiegley-autogen.sbv>
+
+
+### TODO <./subtitles/emacsconf-2020--39-nongnu-elpa--questions--richard-stallman-autogen.sbv>
+
+
+### TODO <./subtitles/emacsconf-2020--39-nongnu-elpa--richard-stallman-autogen.sbv>
+
+
+### TODO <./subtitles/emacsconf-2020--40-closing-remarks-part-1-autogen.sbv>
+
+
+### TODO <./subtitles/emacsconf-2020--40-closing-remarks-part-2-autogen.sbv>
+
+
+### TODO <./subtitles/emacsconf-2020--41-opening-remarks-autogen.sbv>
+
+
+### TODO <./subtitles/emacsconf-2020--42-closing-remarks-autogen.sbv>
+
+
+## DONE Create tasks for each of the subtitles
+
+
+## DONE Link compressed videos on each talk page
+
+    (mapc (lambda (o)
+            (if (string-match "\\(emacsconf-2020--\\([0-9]+\\).*?\\)-vp9-q56-original-audio\\.webm" o)
+                (let ((talk-id (match-string 2 o))
+                      (base (match-string 1 o)))
+                  (find-file (expand-file-name (concat talk-id ".md") "~/vendor/emacsconf-wiki/2020/info"))
+                  (goto-char (point-min))
+                  (when (re-search-forward base nil t)
+                    (forward-line 1)
+                    (beginning-of-line)
+                    (unless (looking-at "\\[Download")
+                      (insert (format "[Download compressed %s.webm video (%s)](https://media.emacsconf.org/2020/%s)\n"
+                                      (if (string-match "questions" o) "Q&A " "")
+                                      (file-size-human-readable (file-attribute-size (file-attributes o)))
+                                      (file-name-nondirectory o))))))))
+          (directory-files "~/vendor/emacsconf-original-audio" t "webm"))
+
+
+# Workflows
+
+STREAM - main organizer, CHECK - secondary organizer or volunteer, PAD - organizer focusing on pad
+
+
+### Planning
+
+-   Collect e-mail addresses of accepted speakers into a list for easy pasting into Bcc (organizers' private wiki)
+-   See submissions.org for Org scheduling code; 3 minutes of buffer was okay last time, but more would be better for Q&A; opening remarks time could be trimmed
+
+
+### Before the conference
+
+-   Do tech checks and get alternative ways to contact speakers (phone number? IRC nick? Something that goes ding?)
+-   Install Mute Tab extension if desired
+-   Send encoding tips for prerecs
+-   Normalize audio for prerecs
+-   Put prerecs in `orga@front0:~/prerecs` so that people can use mediainfo to check duration
+-   Plan volunteer availability
+-   Set up local icecast server and have live0 relay
+-   Create individual talk pages and schedule.
+-   Set up pad with Q1: Q2: Q3: Q4: slots
+
+-   Tech check
+
+    -   Explain process
+    -   Test audio, webcam, screensharing, collaborative pad
+        -   Music demos and other things that use system audio will need to be prerecorded (or done through virtual loopback device, maybe? Technical risk.)
+        -   Multi-monitor setups might not be handled well by BBB; share window instead of desktop
+    -   Check if comfortable checking into IRC: #emacsconf-org
+    -   Ask about Q&A preference; OR:
+        -   live Q&A
+        -   Q&A over pad or IRC
+        -   no Q&A
+    -   Get IRC nick and phone number for emergency contact, store in private wiki
+    -   Try to record name pronunciation
+    -   Encourage webcam for Q&A, although make it clear that it's totally optional
+    -   Possible picture-in-picture approach to maximize screen real estate
+        -   Linux: share desktop, run cheese, set Always on Top
+
+
+### During the conference
+
+-   Start of streaming
+
+    -   STREAM starts streaming and has live0 relay
+    -   STREAM displays time on screen: `watch TZ=America/New_York date` ?
+    -   CHECK confirms stream and starts low-resolution mirror
+    
+    -   ffmpeg: mirror main stream to low-resolution stream
+    
+        Needs the `$main480p` environment variable set to somethnig of the form `icecast://username:password@site:port/mount-point.webm`. Icecast configuration can be found on `live0` at `/etc/icecast2/icecast.xml`. It was okay to run this command directly on `live0` in 2020, since that kept the speed at roughly 1x.
+        
+            while true; do ffmpeg -f webm -reconnect_at_eof 1 -reconnect_streamed 1  -re -i http://localhost:8000/main.webm -vf scale=854:480 -f webm -c:a copy -b:v 500k -maxrate 1M -bufsize 1M  -content_type video/webm -c:v libvpx  $main480p done
+
+-   Shortly before the presentation
+
+    -   Speaker checks in via IRC ~30m before
+    -   CHECK directs speaker to available room
+    -   Speaker joins talk room
+    -   CHECK makes speaker presenter and moderator, does last-minute tech check
+        -   Hello, thanks
+        -   Speaker tries screen sharing and webcam
+        -   check screen readability
+        -   CHECK briefs speaker on process, including:
+            -   confirming preferences:
+                -   prerec / live talk
+                -   live Q&A / IRC / no Q&A
+                -   live Q&A: reading questions themselves (can do in any order, can skip) or asking STREAM to read questions to them
+            -   encouragement of webcam, although it's optional
+            -   how STREAM will join and then give them the go-ahead
+            -   closing any tabs watching the stream as their talk starts (otherwise the audio is confusing)
+            -   starting with saying their name clearly and doing a quick intro to their talk
+    -   CHECK notifies STREAM with link to the talk room and preferences for prerec or live talk, live Q&A / IRC / no Q&A
+    -   STREAM joins meeting and gives go-ahead
+    -   CHECK starts recording in BBB
+    -   CHECK announces on IRC
+    -   PAD clears the pad colours and updates timestamp
+
+-   During the presentation
+
+    -   OR:
+        -   Live presentation? 
+            -   Speaker presents, keeping an eye on the collaborative pad for questions
+            -   STREAM stays with speaker to stream and to help with questions and timing
+        -   Prerecorded? STREAM plays prerecorded video on computer
+        -   Streamed live from somewhere else?
+            -   Make sure to have a separate way to communicate (ex: IRC)
+    -   OTHER keeps an eye on audio levels and tells STREAM if adjustments are needed
+    -   If there is another speaker, CHECK moves to next room for setup
+    -   OTHER moves past prerecs to public directory (maybe even current?)
+        -   (It would be pretty cool if we can figure out how to make the previous talks available for watching)
+
+-   Q&A
+
+    -   STREAM joins speaker's room if not already there
+    -   STREAM gives go-ahead to start Q&A
+    -   Speaker reads questions off the pad or gets questions from STREAM
+    -   Time is indicated by having an organizer type into the Etherpad, or speaking up if needed
+    -   If moderation is needed, organizers add a reminder that speakers can choose to skip questions or answer in any order
+    -   STREAM goes to next talk when ready
+
+-   Lunch break
+
+    -   STREAM plays music
+    -   STREAM quickly highlights `#emacsconf-accessible`, Etherpad, notes
+
+-   Scenarios
+
+    -   Prerecorded presentations
+    
+        -   STREAM will play it on the computer and stream from there (or ideally, send it directly to the stream)
+    
+    -   Tech issues
+    
+        -   If can't be easily resolved, play pre-recorded talk early and try again later (or follow up)
+        -   Stream a technical issues slide to the end point
+
+-   Code for ERC
+
+    -   Load data
+    
+            (defvar conf/collaborative-pad "https://etherpad.wikimedia.org/p/emacsconf-2020" "URL of collaborative pad.")
+            (defvar conf/topic-templates nil "List of (channel topic-template) entries for mass-setting channel topics.")
+            (defvar conf/streaming-nick "bandali" "IRC nick of main organizer in charge of streaming.")
+            "List of (code join-url) entries, one for each meeting room.")  ;; Set this in a private file
+            (defvar conf/channels nil "List of IRC channels for broadcasts.")
+            (defvar conf/info nil "List of plists with the following keys: `:talk-id', `:name', `:speakers', and other info.") ; Set from submissions.org
+            (setq conf/topic-templates 
+            '(("#emacsconf" "EmacsConf 2020 is over, thanks for joining! | Subscribe to https://lists.gnu.org/mailman/listinfo/emacsconf-discuss for updates")
+              ("#emacsconf-accessible" "EmacsConf 2020 is over. Thanks for making it more accessible! | Subscribe to https://lists.gnu.org/mailman/listinfo/emacsconf-discuss for updates")
+              ("#emacsconf-org" "EmacsConf2020 is over, thanks for joining! | Dedicated channel for EmacsConf organizers and speakers | this is intended as an internal, low-traffic channel; for main discussion around EmacsConf, please join #emacsconf | Subscribe to https://lists.gnu.org/mailman/listinfo/emacsconf-discuss for updates")))
+            (defvar conf/rooms '(("A" "http://example.org?room=a")
+                                 ("B" "http://example.org?room=b")
+                                 ("C" "http://example.org?room=c")) 
+              "List of (code join-url) entries. Room codes should be uppercase.") ; set from organizers' wiki index.org
+    
+    -   Announce topics
+    
+            (defmacro conf/erc-with-channels (channel-list &rest forms)
+              (declare (indent 1) (debug (form form body)))
+              `(mapcar (lambda (channel)
+                         (with-current-buffer (erc-get-buffer channel)
+                           ,@forms))
+                       ,channel-list))
+            
+            (defun conf/get-room (room)
+              (cadr (assoc (upcase room) conf/rooms)))
+            
+            (defun erc-cmd-CONFTOPIC (&rest message)
+              "Set the topic to MESSAGE | template in the conference channels.
+            If MESSAGE is not specified, reset the topic to the template."
+              (mapc (lambda (template) 
+                      (with-current-buffer (erc-get-buffer (car template))
+                        (erc-cmd-TOPIC (if message (concat (if (stringp message) message (s-join " " message)) " | " (cadr template))
+                                         (cadr template)))))
+                    conf/topic-templates))
+            
+            (defun erc-cmd-CHECKIN (room nick)
+              "Send instructions for ROOM and `conf/collaborative-pad' to NICK."
+              (let ((room-url (conf/get-room room)))
+                (unless room-url (error "Please specify nick and room name"))
+                (erc-send-message (format "%s: Thanks for checking in! I'll send you some private messages with the instructions for room %s, so please check there. (Let me know if you don't get them!)" nick
+                (upcase room)))
+                (erc-message "PRIVMSG" (format "%s You can use this BBB room for your presentation: %s . I'll join you there shortly to set up the room and do the last-minute tech check." nick room-url))
+                (erc-message "PRIVMSG" (format "%s The collaborative pad we'll be using for questions is at %s . We'll collect questions from #emacsconf and put them there. If you'd like to jump to your part of the document, you might be able to keep an eye on questions. Alternatively, we can read questions to you." nick conf/collaborative-pad))
+                (erc-message "PRIVMSG" (format "%s Amin will join when it's time for your presentation, and he will give you the go-ahead when it's time to present. See you in the BBB room!" nick))))
+            
+            (defun erc-cmd-READY (code &rest filter)
+              "Notify #emacsconf-org and `conf/streaming-nick' that CODE is ready for the talk specified by FILTER.
+            FILTER can be the talk ID or strings to match against the title or speaker names."
+              (let ((room-url (conf/get-room code))
+                    (talk (conf/find-talk filter)))
+                (unless room-url (error "Could not find room"))
+                (unless talk (error "Could not find talk"))
+                (with-current-buffer (erc-get-buffer "#emacsconf-org")
+                  (erc-send-message (format "Ready in Room %s: %s (%s)"
+                                            (upcase code)
+                                            (plist-get talk :title)
+                                            (plist-get talk :speakers))))
+                (erc-message "PRIVMSG" 
+                             (format "%s Ready in Room %s ( %s ): %s (%s)"
+                                     conf/streaming-nick
+                                     (upcase code)
+                                     room-url
+                                     (plist-get talk :title)
+                                     (plist-get talk :speakers)))))
+            
+            (defun erc-cmd-ANNOUNCE (&rest filter)
+              "Set the channel topics to announce the talk specified by FILTER.
+            FILTER can be the talk ID or strings to match against the title or speaker names."
+              (let ((info (conf/find-talk filter)) message)
+                (unless info (error "Could not find talk."))
+                (erc-cmd-CONFTOPIC (format "talk%s: %s (%s)"
+                                           (plist-get info :talk-id)
+                                           (plist-get info :title)
+                                           (plist-get info :speakers)))))
+            
+            (defun erc-cmd-BROADCAST (&rest message)
+              "Say MESSAGE in all the conference channels."
+              (conf/erc-with-channels conf/channels
+                                      (erc-send-message (s-join " " message))))
+
+
+### After the conference
+
+-   Convert pad, copy sections to individual pages
+
+    This makes the links available right away
+
+-   Split individual files
+
+    Post to individual pages, and make a talks page with durations. Change individual schedule pages to redirect to talks (or start there in the first place).
+    
+    Announcement example: <https://lists.gnu.org/r/emacsconf-discuss/2020-12/msg00000.html>
+    
+    -   Splitting up the stream recording into individual files
+    
+        NOTE: ffmpeg has a hard time splitting with -c:v copy unless it's on a
+        keyframe boundary. If it isn't on a keyframe, then you'll have a few
+        seconds of black video until the next keyframe kicks in.
+        
+        Here's an example of what we had for splitting.
+        
+            ffmpeg -y -i main.webm-2020-11-28--08-48.webm -ss   13:04 -to   20:08    -c:a copy -c:v copy emacsconf-2020--00-opening-remarks.webm
+            ffmpeg -y -i main.webm-2020-11-28--08-48.webm -ss   27:24 -to   51:39    -c:a copy -c:v copy emacsconf-2020--03-an-emacs-developer-story-from-user-to-package-maintainer--leo-vivier.webm
+            ffmpeg -y -i main.webm-2020-11-28--08-48.webm -ss 1:00:08 -to 1:09:22    -c:a copy -c:v copy emacsconf-2020--03-idea-to-novel-superstructure-emacs-for-writing--questions--bala-ramadurai.webm
+            ffmpeg -y -i main.webm-2020-11-28--08-48.webm -ss 1:41:28 -to 1:55:13    -c:a copy -c:v copy emacsconf-2020--05-bard-bivoumacs-building-a-bandcamp-like-page-for-an-album-of-music--questions--grant-shangreaux.webm
+            ffmpeg -y -i main.webm-2020-11-28--08-48.webm -ss 1:57:24 -to 2:11:05    -c:a copy -c:v copy emacsconf-2020--06-trivial-emacs-kits--corwin-brust.webm
+            ffmpeg -y -i main.webm-2020-11-28--08-48.webm -ss 2:32:00 -to 2:36:35    -c:a copy -c:v copy emacsconf-2020--07-beyond-vim-and-emacs-a-scalable-ui-paradigm--questions--sid-kasivajhula.webm
+            ffmpeg -y -i main.webm-2020-11-28--08-48.webm -ss 4:55:00 -to 5:11:38    -c:a copy -c:v copy emacsconf-2020--12-one-big-ass-org-file-or-multiple-tiny-ones-finally-the-end-of-the-debate--leo-vivier.webm
+            ffmpeg -y -i main.webm-2020-11-28--08-48.webm -ss 5:47:44 -to 6:04:17    -c:a copy -c:v copy emacsconf-2020--15-moving-from-jekyll-to-orgmode-an-experience-report--adolfo-villafiorita.webm
+            ffmpeg -y -i main.webm-2020-11-28--08-48.webm -ss 6:06:00 -to 6:27:56    -c:a copy -c:v copy emacsconf-2020--16-org-roam-presentation-demonstration-and-whats-on-the-horizon--leo-vivier.webm
+            ffmpeg -y -i main.webm-2020-11-28--08-48.webm -ss 7:24:00 -to 7:27:09.50 -c:a copy -c:v copy emacsconf-2020--40-closing-remarks-part-1.webm
+            ffmpeg -y -i main.webm-2020-11-28--08-48.webm -ss 7:28:00 -to 7:50:50    -c:a copy -c:v copy emacsconf-2020--20-omg-macros--corwin-brust.webm
+            
+            ffmpeg -y -i main.webm-2020-11-29--08-44.webm -ss   15:40 -to   27:27    -c:a copy -c:v copy emacsconf-2020--41-opening-remarks.webm
+            ffmpeg -y -i main.webm-2020-11-29--08-44.webm -ss   34:48 -to 1:03:54.75 -c:a copy -c:v copy emacsconf-2020--22-powering-up-special-blocks--musa-al-hassy.webm
+            ffmpeg -y -i main.webm-2020-11-29--08-44.webm -ss 1:30:40 -to 1:49:18    -c:a copy -c:v copy emacsconf-2020--23-incremental-parsing-with-emacs-tree-sitter--questions--tuan-anh-nguyen.webm
+            ffmpeg -y -i main.webm-2020-11-29--08-44.webm -ss 4:33:04 -to 4:37:30    -c:a copy -c:v copy emacsconf-2020--26-emacs-as-a-highschooler-how-it-changed-my-life--questions--pierce-wang.webm
+            ffmpeg -y -i main.webm-2020-11-29--08-44.webm -ss 4:50:00 -to 5:59:30    -c:a copy -c:v copy emacsconf-2020--28-welcome-to-the-dungeon--erik-elmshauser-corwin-brust.webm
+            ffmpeg -y -i main.webm-2020-11-29--08-44.webm -ss 6:08:20 -to 6:12:42.40 -c:a copy -c:v copy emacsconf-2020--30-a-tour-of-vterm--questions--gabriele-bozzola-sbozzolo.webm
+            ffmpeg -y -i main.webm-2020-11-29--08-44.webm -ss 6:25:18 -to 6:31:04.90 -c:a copy -c:v copy emacsconf-2020--31-lakota-language-and-emacs--questions--grant-shangreaux.webm
+            ffmpeg -y -i main.webm-2020-11-29--08-44.webm -ss 6:58:20 -to 7:20:38    -c:a copy -c:v copy emacsconf-2020--33-maxima-a-computer-algebra-system-in-emacs--fermin.webm
+            ffmpeg -y -i main.webm-2020-11-29--08-44.webm -ss 6:58:20 -to 7:20:38    -c:a copy -c:v copy emacsconf-2020--33-maxima-a-computer-algebra-system-in-emacs--fermin.webm
+            ffmpeg -y -i main.webm-2020-11-29--08-44.webm -ss 7:55:44 -to 8:02:02    -c:a copy -c:v copy emacsconf-2020--35-waveing-at-repetitive-repetitive-repetitive-music-zmusic--questions--zachary-kanfer.webm
+            ffmpeg -y -i main.webm-2020-11-29--08-44.webm -ss 8:03:32 -to 8:40:01.10 -c:a copy -c:v copy emacsconf-2020--42-closing-remarks.webm
+        
+        This fiddles with the `-ss` to make it divisible by 4. Run this code before a copy of the ffmpeg scripts (adjusting the value of adjust as needed) and it will show only the lines that need tweaking.
+        
+            (save-excursion
+              (while (re-search-forward "^ffmpeg.*?-ss +\\([^ ]++?\\) +.*$" nil t)
+                (let* ((adjust 4)
+                       (from (save-match-data
+                              (let ((s (match-string 1)) num)
+                                (if (string-match "\\(\\([0-9]+\\):\\)?\\([0-9]+\\):\\([0-9]+\\)\\(.[0-9]+\\)?" s)
+                                    (progn
+                                      (setq num
+                                            (+ (* 3600 (string-to-number (or (match-string 2 s) "0")))
+                                               (* 60 (string-to-number (or (match-string 3 s) "0")))
+                                               (string-to-number (or (match-string 4 s) "0"))
+                                               (string-to-number (concat "0" (or (match-string 5 s) "")))))
+                                      (if (> (% num adjust) 0)
+                                          (number-to-string (- num (% num adjust)))
+                                        nil))
+                                  s)))))
+                  (if from
+                      (replace-match from nil nil nil 1)
+                    (replace-match "")))))
+        
+        Thanks to SirVolta and bandali for figuring out keyframe issue!
+        
+        Further reading:
+        
+        (all links work with LibreJS enabled)
+        <https://blog.video.ibm.com/streaming-video-tips/keyframes-interframe-video-compression/>
+        <https://blog.streamspot.com/blog/compression-codecs-keyframes-and-the-basics-of-stream-quality>
+        <https://blog.superuser.com/2012/02/24/ffmpeg-the-ultimate-video-and-audio-manipulation-tool/>
+        <https://superuser.com/questions/138331/using-ffmpeg-to-cut-up-video>
+        <http://blog.webmproject.org/2010/05/inside-webm-technology-vp8-alternate.html>
+
+-   Collect speaker feedback
+
+    Another collaborative pad
+
+-   Encode highly-compressed versions
+
+    [Compressing video](#org92fc53f)
+
+-   Compressing video
+
+    Thanks to ArneBab for this ffmpeg script which is now documented in [Extreme compression of Video with VP9 (webm) using ffmpeg](https://www.draketo.de/software/ffmpeg-compression-vp9-av1). We modified it to keep the original audio.
+    
+    Usage: compress-video.sh input-filename.webm output-filename.webm
+    
+        Q=56
+        nice ffmpeg -y -i $1 -c:v libvpx-vp9 -b:v 0 -crf $Q -aq-mode 2 -an -tile-columns 0 -tile-rows 0 -frame-parallel 0 -cpu-used 8 -auto-alt-ref 1 -lag-in-frames 25 -g 999 -pass 1 -f webm -threads 8 /dev/null &&
+        nice ffmpeg -y -i $1 -c:v libvpx-vp9 -b:v 0 -crf $Q -c:a copy -tile-columns 2 -tile-rows 2 -frame-parallel 0 -cpu-used -5 -auto-alt-ref 1 -lag-in-frames 25 -pass 2 -g 999 -threads 8 $2
+    
+    Here's the original version which compresses audio too. Usage: compress-video-compressed-audio.sh input-filename.webm output-filename.webm
+    
+        Q=56
+        nice ffmpeg -y -i $1 -c:v libvpx-vp9 -b:v 0 -crf $Q -aq-mode 2 -an -tile-columns 0 -tile-rows 0 -frame-parallel 0 -cpu-used 8 -auto-alt-ref 1 -lag-in-frames 25 -g 999 -pass 1 -f webm -threads 8 /dev/null &&
+        nice ffmpeg -y -i $1 -c:v libvpx-vp9 -b:v 0 -crf $Q -aq-mode 2 -c:a libopus -b:a 12k -tile-columns 2 -tile-rows 2 -frame-parallel 0 -cpu-used -5 -auto-alt-ref 1 -lag-in-frames 25 -pass 2 -g 999 -threads 8 $2
+
+-   Upload to alternative video hosting platforms once main announcement has been out for a few days
+
+    Create playlist, too
+
+-   Add subtitles
+
+    Take advantage of provided scripts or autogenerated files
+    
+    -   Code sachac used to move sbv files from the Downloads directory
+    
+        Autogenerated captions can save a bit of time when setting up
+        captions. This code renames a downloaded file to match the current
+        file's naming scheme and moves it to the right directory.
+        
+            (defvar conf/subtitle-directory (expand-file-name "subtitles" default-directory) "Directory where subtitles will be kept.")
+            (defvar conf/download-directory "~/Downloads" "Directory where downloaded files are saved.")
+            
+            (defun my/latest-file (path &optional filter)
+              "Returns the newest file in PATH.
+            If FILTER is specified, files should match this regex."
+              (car (sort (seq-remove #'file-directory-p (directory-files path 'full filter t)) #'file-newer-than-file-p)))
+            (defun my/rename-latest-download-as-subtitle-file ()
+              "Rename the most recent downloaded file to match the current file and move it to `conf/subtitle-directory'.
+            To use this, open a Dired buffer with a list of the correctly-named
+            videos. Move your cursor to the line for the video that you have just
+            downloaded captions for, then call `my/rename-latest-download-as-subtitle-file.'"
+              (interactive)
+              (let* ((file (my/latest-file conf/download-directory))
+                     (new-file (expand-file-name (concat (file-name-base (dired-get-filename)) "-autogen." (file-name-extension file)) conf/subtitle-directory)))
+                (rename-file file new-file t)
+                (message "%s" new-file)))
+            ;; Ex: (local-set-key [f5] 'my/rename-latest-download)
+        
+        To convert from SBV to VTT (used for the HTML5 video player) and fix
+        timestamps so that they're not overlapping, install `python3-webtt`
+        and run <subtitles/fix.py> like this: `fix.py
+            emacsconf-2020--04-music-in-plain-text--jonathan-gregory.sbv`.
+
+
+# Other useful tidbits
+
+
+## Restarting ikiwiki manually
+
+This is needed when you change the template or if the ikiwiki process gets stuck on something.
+
+    ssh front 'sudo -iu ikiwiki ikiwiki --setup ~ikiwiki/emacsconf.setup'
+