WEBVTT
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[Speaker 0]: You can hear us. Can you perhaps do it for
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me? Great. The little angels in the
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background have done it for me.
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So now finally that everything is ready.
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Hi James, how are you doing?
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Good morning. Hello. Well,
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thank you for your talk and sorry for the
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little hiccup at the middle we had to pull
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out a fire with the audio going out in the
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middle and sorry about this.
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[Speaker 1]: It's no trouble.
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[Speaker 0]: So James, you've obviously told us about your
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very fancy setup with the green screen and
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I'm sad to see that you haven't put out the
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green screen for your BBB session right now.
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Do you have it in the background just for
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you? Right, okay, it wasn't that far.
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Great. So I'm just going to ask,
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so this is the first live Q&A that we have
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for the session so things might be coming
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into place so pardon us if we take a little
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bit of time to put the questions on the
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screen and all of this.
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What I'm going to do, I'm just going to load
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up the pad. I would invite James to also open
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the pad on his hand. So yeah,
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I've got people talking in my ears and it's
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been a while since I've last had this.
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And okay, so opening the talks right now,
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opening the pad if I can find it.
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Open up the pad. Okay.
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So have you got a pad open on your end,
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James? So I can read the question.
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So, okay, great. Opening it on my end as
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well. What I'm going to do,
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folks, I see some of you have joined us.
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I'm going to start doing is first taking
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questions in the other part because it's a
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little faster to ask questions like this.
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And then as soon as we've finished,
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feel free to unmute yourself and ask your
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questions. All right so I've got some
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reactions about OBS being cool and yes both
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James and I will be able to tell you that
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it's very cool we do very fancy stuff like
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when I need to talk to production in the
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background and all the stuff obviously that
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James has been able to show you with a green
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screen. So I don't see a whole lot of
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questions so far. I see a lot of reactions on
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publishing lectures book and of a classic
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example is John Kitchens obviously.
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Pedagogy first developments.
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Macros are a cool idea.
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Okay questions. So how do you overlap
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yourself with a presentation.
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It's so cool. It's quite simple.
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[Speaker 1]: OBS provides filters for every...
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You can have a separate filter for each video
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feed and 1 of the filters that's available is
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chroma key. You just choose a color to make
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transparent and just make sure that the
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webcam is at the top of the composition.
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And the thing that surprised me the most was
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how quickly my brain was able to mirror
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everything and control my body from a
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separate point of view like the way weather
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broadcasts are done. It took seconds to be
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able to do that. Well,
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and now I have years of practice because that
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set up that you saw that I used to record
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this video. I used for years during the
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pandemic for 4 or 5 semesters to because my
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courses are all have 2,
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3, 400 students, except for the English
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class, which has, you know,
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30 students. And so during the pandemic,
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and even after lockdowns were no longer
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mandated, I taught online just because I
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didn't want to have so many students in the
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room at the same time.
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So I've yeah, I'm it. I have a lot of
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practice doing that.
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[Speaker 0]: But it pays off because it looks so natural,
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you know, it feels like it's the same thing
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with weathercasters, you know,
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it sounds very it looks very easy to do,
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but it also takes quite a bit of practice.
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1 of the things that you also need to
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remember if you're using a chroma key that
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James has explained is that you need to have
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very good lighting, basically for the color
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to pop out in the background and for your
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body to be easily highlightable.
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Okay, were you finished with this question?
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[Speaker 1]: Yeah, let's take another 1.
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[Speaker 0]: Sure. So how do you deal with video in Beam?
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I found it so hard to do that.
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PPT on the other end is easier to achieve.
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[Speaker 1]: Yeah, so remember that the slides get
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produced from Org Mode as PDFs.
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Well, and in fact, I even before when I was
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using other software to produce slides,
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I produced them as PDFs,
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precisely because I wanted to be able to mark
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them up on on the screen with the stylus.
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And so I don't do video in the slides.
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I use OBS to switch from static slides that I
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mark up with the stylus over to some kind of
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video viewer and then back.
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And again, that's how I can use Firefox.
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I use OBS to switch between Firefox and video
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and the Shornell plus plus program where I
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can mark up slides. So those functionalities
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are that's why I use different software and
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pull it all together with OBS so that I can
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have lots of functional flexibility.
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[Speaker 0]: Great. Do you ever use things like
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org-present and stay for the PowerPoint
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slides? I'm not sure exactly how to read this
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particular question but at least we can focus
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on org-present. Are you familiar with what it
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is?
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[Speaker 1]: I have played around with org-present and
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again I guess you could use org-present to
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show images and to show headings as slides.
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But again, because I'm it's such a crucial
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functionality to be able to mark them up with
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stylus. I didn't really show this very much,
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but I also highlight things the way I would
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highlight using a laser pointer on the
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screen. And again, I don't see Emacs being
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able to do that for another couple of
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generations. So really the only thing I use
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Emacs for during presentations is to narrow
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headings that we can focus on particular text
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excerpts.
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[Speaker 0]: Right. Yeah. A lot of our presentation at
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EmacsConf are usually,
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especially the Org Mode ones are done with
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OrgPresent. And. Sorry,
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I had again someone talk to me in a year.
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You know, the problem with EmacsConf is that
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every year, you know, you have to relearn a
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lot of skills. And by the time we finished by
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Sunday evening we are masters of it and then
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we forget everything by the time the next
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year comes around. What I was going to say is
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that org-present is often used by people
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inside Emacs conf presenting about org-mode
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but yeah whenever you need to do something a
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little more visual, it gets a little more
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complicated. Some people have tried to do
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fancy stuff with SVG, which is probably the
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path forward for this type of stuff.
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But yeah, if you need to draw,
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if you need to highlight,
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it is pretty complicated.
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Perhaps something that you might want to be
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interested, James, in checking out is PDF
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tools, which is a way to open up a PDF in
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Emacs. And this allows you to have basic PDF
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annotations, like putting a little bit of a
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Nikon on it. Perhaps you've already played
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with it.
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[Speaker 1]: I have used that. PDF tools is an incredible
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package but until it allows me to make a mark
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on the screen that shows up in a video
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compositor. It's not going to replace
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Shortenel.
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[Speaker 0]: Definitely. All right.
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Moving on to the next question.
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Is the triple-accolade syntax an Org Mode
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core feature that I missed so far or did you
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program that and thank you for the great
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talk.
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[Speaker 1]: Thank you very much. No,
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it's just part of all of the export backends.
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Actually, I think the way it works is it
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precedes all of the export backends.
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When you export, the first thing that happens
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is expansion of macros.
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And that's a built-in org mode feature.
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It's definitely beyond my Emacs Lisp powers
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to be able to have made something that
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powerful. That's right.
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I have come a long way.
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[Speaker 0]: For now. You know, we always,
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you know, most of the people who show up to
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Max Conf. Especially talking about stuff that
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has to do with presentations or what they do
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in academia. You know,
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they always say, oh, but,
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you know, I couldn't have done all this,
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you know, it's just far away.
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And then they come back 1 year or 2 years
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later and then, oh, I've made my entire
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library for presentation and stuff like this.
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So Be hopeful about what the future holds for
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you in terms of coming up with crazy new
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features for the entire ecosystem.
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[Speaker 1]: Well, let me tell you,
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since the pandemic, I have written,
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I wrote my first major mode.
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It's trivial, but it provides functionality
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that is very useful to me and it's it's going
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to sound like I'm just trying to butter
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everyone up but seeing a lot of the names in
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the IRC channel people who have taught me so
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much on their YouTube channels and in their
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blog posts and on Reddit and on Mastodon.
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Without many of the people who are here today
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watching my talk, it's very fun to have
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people who have helped me learn so much about
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Emacs. So thanks to all of you.
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[Speaker 0]: Well, and yeah, and now you're becoming part
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of this crew of people inspiring others to do
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very much the same. So thank you for joining
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[Speaker 1]: Thank you very much.
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[Speaker 0]: the crew. Great. Moving on to the 2 last
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questions and then we'll open up the mic to
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other people on Big Blue Button.
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What kind of comparative feedback are
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students giving you regarding your approach?
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[Speaker 1]: Oh, my gosh. Students were ready to during
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the pandemic especially when most of the
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courses were just being taught over zoom by
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people sharing their screen.
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[Speaker 0]: Just a second. Sorry. Sorry for the
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interruption. Very rude interruption.
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We've got the intro for the next talk playing
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and I'm not sure what's going on.
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Give me just a second.
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Sasha.
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[Speaker 1]: Okay.
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Yeah, I think it's started.
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Okay so yeah I think it's not a
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[Speaker 0]: sure 1 I got the times wrong apparently
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because of the little delay we had getting
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the audio fixed up. The good news is that
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we're still recording the talk right now and
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we still have James around.
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Obviously James you're no longer on being
00:11:49.740 --> 00:11:53.040
broadcast on General but if you want to keep
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answering questions or if you want to anyone
00:11:55.800 --> 00:11:57.340
in the room right now wants to ask you
00:11:57.340 --> 00:11:58.940
questions feel free to do so.
00:11:59.440 --> 00:12:01.060
I'm going to need to hop off because I need
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to get other things ready for the next talks
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[Speaker 1]: But James, thank you so much.
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[Speaker 0]: sadly. Right and so sorry I'm a little tense
00:12:10.020 --> 00:12:12.660
obviously because I was not expecting this to
00:12:12.660 --> 00:12:15.960
happen and that led to a very abrupt end to
00:12:15.960 --> 00:12:18.480
this discussion but people afterwards on
00:12:18.480 --> 00:12:21.980
emacsmo.org slash 2023 slash talks will be
00:12:21.980 --> 00:12:24.020
able to find all the content here.
00:12:24.020 --> 00:12:25.420
So I'll have to leave now.
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Thank you so much James for doing the
00:12:28.020 --> 00:12:30.060
difficult task of opening up EmacsConf and
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I'll probably see you later.
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[Speaker 1]: Thank you, Leo. Bye bye.
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[Speaker 2]: On your journal program.
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Yes. You are using the tablet as a monitor,
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right? Touch screen monitor with that?
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[Speaker 1]: That's exactly right. So it's a tablet so you
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know I can. It has a touch screen and so.
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So basically the functionality that that
00:13:15.580 --> 00:13:20.580
program provides is to be able to just mark
00:13:20.580 --> 00:13:22.160
up PDFs with a stylus,
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you know, in the way that you would use any
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other tablet. And to be able to take that
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video signal and put it into another machine.
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That was the that was the key.
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That's the killer app.
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[Speaker 2]: I've thought about grabbing 1 for the purpose
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of like changing my laptop into a tablet to
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read manga, browse the web and kind of
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curious if it works well like as a wireless
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monitor with a tablet or how well it like you
00:13:57.440 --> 00:14:01.920
can use Emacs with it in a tablet mode or
00:14:02.080 --> 00:14:03.000
were you just
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[Speaker 1]: or you just use the tablet that I use is this
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is it it's just a Microsoft Surface and so it
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comes with a keyboard so you can take the
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keyboard off. Yeah, but I use it.
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I use it with the keyboard as well.
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And I just.
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[Speaker 2]: You're cutting off right now
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[Speaker 1]: Audio Your audio is cutting off right now.
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I bumped the mute button on the mic.
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Yeah. So again, this is,
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[Speaker 2]: is the 16 mute buttons you use.
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[Speaker 1]: this It's just the surface pro 3 that I got
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used and it runs Emacs.
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I mean it runs. You know Linux really well.
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And the trouble is that the hard drive you
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know the SSE drive is small and the RAM is
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small, but it works for the purposes.
00:16:07.580 --> 00:16:10.080
Basically, if I had a couple thousand
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dollars, I could probably buy a touchscreen
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machine where I could run everything on it
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and do the streaming and do the video capture
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and do the PDF markup.
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But since both of these are so,
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the hardware that I use is so old and cheap
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and weak I have to split it across 2
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machines.
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[Speaker 2]: There's also a beauty in making the stuff
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having specific purposes for specific things
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where it's just not. Yeah it's like I don't
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want a smart TV that plays Netflix I want a
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smart TV that has all the smarts that I turn
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my smart TV into a TV monitor I don't want to
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yeah
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[Speaker 1]: I totally feel that ethic I totally I totally
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feel that ethic. Oh, on
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[Speaker 2]: the some other things like if you want you to
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do highlighting in an org mode document.
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You can use org web tools.
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I wrote this in the notes,
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but you can use org web tools to download a
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web page and then you can use org remark to
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start highlighting in the org mode web page
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and then because an org mode document now you
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can just edit it directly.
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If you want other people to join in on an
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Emacs session you could use a package like
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what's it called? CRDT.EL
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that will allow 2 people with 2 different
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Emacs configurations to edit the same buffer.
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And you have a host that can host a buffer
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too. It works with, and they have 1 optional
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extension for org mode that will synchronize
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the folding of the org drawers.
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[Speaker 1]: Interesting. I will look into that.
00:18:15.060 --> 00:18:15.560
Like
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[Speaker 2]: having I don't like if you want students like
00:18:22.720 --> 00:18:25.740
you have each highlight line mode these are
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just some ideas like you can have like
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highlight line mode so people can easily see
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which line you're on cursor tracking and then
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you can have other people join in students or
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[Speaker 1]: yeah that's just a possible idea.
00:18:45.300 --> 00:18:49.680
Is there anyone else in the in the big blue
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button room who has a question?
00:19:01.360 --> 00:19:03.280
All right, I'm going to go over to the pad
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and see if there are any pending questions I
00:19:05.280 --> 00:19:07.560
can address. Thanks, Plasma Strike.
00:19:27.500 --> 00:19:33.140
[Speaker 3]: Yep. Which could be PDF,
00:19:33.340 --> 00:19:36.680
could be Markdown, could be OpenOffice,
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could be a notebook format.
00:19:40.960 --> 00:19:43.340
This methodology was conceived by Donald
00:19:43.340 --> 00:19:51.980
Knuth in 1984. The main purpose of literal
00:19:51.980 --> 00:19:54.700
programming is not only to make code or
00:19:54.700 --> 00:19:57.220
documentation or output more manageable,
00:19:57.800 --> 00:20:01.240
but to allow humans to create a data story to
00:20:01.240 --> 00:20:03.420
be used from a single source.
00:20:04.540 --> 00:20:06.300
What you see on the slide on the left-hand
00:20:06.300 --> 00:20:09.400
side is the story and code inside an org-mod
00:20:09.400 --> 00:20:14.440
file. The file starts with some
00:20:14.440 --> 00:20:17.720
documentation, then you write back down this
00:20:18.420 --> 00:20:22.060
code, and at the bottom you see the output
00:20:22.060 --> 00:20:26.540
file, which is not shown in the slide itself.
00:20:26.800 --> 00:20:28.440
In the middle you have the source code,
00:20:28.440 --> 00:20:33.980
which is the result of tangling or opening a
00:20:33.980 --> 00:20:36.880
buffer inside offload.
00:20:37.660 --> 00:20:42.380
On the very right hand side we have a PDF,
00:20:42.580 --> 00:20:47.740
actually this HTML, very same file that you
00:20:47.740 --> 00:20:48.960
see in memory language.
00:20:49.600 --> 00:20:53.080
So the humans look at some of this code and
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the machines look at other parts of the code.
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I actually did all my programming in the
00:20:58.320 --> 00:21:00.260
literary world even in the early 1990s,
00:21:00.920 --> 00:21:03.040
not using Org Mode, which didn't exist yet,
00:21:03.040 --> 00:21:06.160
but using Norman Ramsey's Norep preprocessor.
00:21:07.240 --> 00:21:09.720
They still use it inside the Org-Mode today.
00:21:10.400 --> 00:21:11.920
This preprocessor, Norep,
00:21:11.920 --> 00:21:14.240
allows you to tangle code from within an
00:21:14.240 --> 00:21:16.360
Org-Mode file that is self-standing file,
00:21:16.360 --> 00:21:18.820
much like Org-mode's edit functions,
00:21:19.540 --> 00:21:21.900
which export code blocks into buffers in
00:21:21.900 --> 00:21:23.540
whatever language the code blocks.
00:21:25.940 --> 00:21:28.760
In data science, these interactive notebooks,
00:21:29.640 --> 00:21:32.776
in 1 of the interpreted languages like Julia,
00:21:32.776 --> 00:21:34.680
Python, or R dominating?
00:21:34.680 --> 00:21:37.420
The basic technology is that of Jupyter
00:21:37.420 --> 00:21:39.840
notebooks, which take their name from Julia,
00:21:39.860 --> 00:21:43.040
Python, and R. And these notebooks use a
00:21:43.040 --> 00:21:44.880
spruce-dark shell, for example,
00:21:44.920 --> 00:21:49.240
IPython, and an option to add SQL cells.
00:21:50.460 --> 00:21:53.340
All good inside Emacs has a large number of
00:21:53.340 --> 00:21:56.800
advantages. Some of them are listed here over
00:21:56.800 --> 00:21:59.180
these notebooks. 2 of these stand out
00:21:59.180 --> 00:22:02.860
particularly. Different languages can be
00:22:02.860 --> 00:22:05.640
mixed as shown in the image.
00:22:06.460 --> 00:22:07.700
While in Jupyter notebooks,
00:22:07.920 --> 00:22:10.900
a notebook is limited to running a kernel in
00:22:10.900 --> 00:22:14.440
1 language only. The content of the notebook,
00:22:14.440 --> 00:22:16.980
its document code or output part can be
00:22:16.980 --> 00:22:19.020
exported in a variety of forms.
