WEBVTT
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[Speaker 0]: And he 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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[Speaker 1]: Good morning. Hello.
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[Speaker 0]: Well, thank you for your talk.
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And sorry for the little hiccup at the middle
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we had to put out a fire with the audio
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going out in the 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. No. 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 this 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 gonna do, I'm just gonna load up the
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pad. I would invite James to also open the
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pad on his hand. Sorry,
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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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Okay, so opening the talks right now.
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Opening the pad, if I can find it.
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Open the pad. Okay. Have you got the pad open
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[Speaker 1]: So I can read the question.
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[Speaker 0]: on your end, James? Okay,
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great. Opening it on my end as well.
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What I'm going to do, folks,
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I see some of you have joined us on,
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if I show you, some of the people that have
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joined us in the BBB room.
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You can join us as well,
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all the links are on the talk page or on ISE,
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you can find it very easily.
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But what I'm going to start doing is first
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taking questions in the other pad because
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it's a little faster to ask questions like
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this, 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,
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both James and I will be able to tell you
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that it's very cool. We do very fancy stuff
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like 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 a classic
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example is John Kitchens obviously.
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Pedagogy first developments macros are a cool
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idea. Okay questions so how do you overlap
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yourself with a presentation it's so cool.
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[Speaker 1]: It's quite simple OBS provides filters for
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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
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is chroma key. You just choose a color to
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make 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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setup that you saw that I used to record this
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video, I used for years during the pandemic
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for 4 or 5 semesters to,
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because my courses are all have 2,
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3, 400 students, except for the English class
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which has you know 30 students and so during
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the pandemic and even after lockdowns were no
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longer mandated I taught online just because
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I 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 practice
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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 weather casters you know it sounds very
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it looks very easy to do but it also takes
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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 to
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pop out in the background and for your body
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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, even before when I was
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using other software to produce slides I
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produced them as PDFs precisely because I
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wanted to be able to mark them up on on the
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screen with the stylus And so I don't do
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video in the slides. I use OBS to switch from
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static slides that I mark up with the stylus
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over to some kind of video viewer and then
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back. 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 Shornal++ program where I can mark up
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slides. So those functionalities are...
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That's why I use different software and pull
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it all together with OBS so that I can have
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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
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focus on org-present. Are you familiar with
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what it is?
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[Speaker 1]: I've played around with org-present,
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And again, I guess you could use OrgPresent
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to show images and to show headings as
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slides. But again, Because it's such a
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crucial functionality to be able to mark them
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up with a stylus. I didn't really show this
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very much, but I also highlight things the
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way I would highlight using a laser pointer
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on the screen. And again,
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I don't see Emacs being able to do that for
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another couple of generations.
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So really the only thing I use Emacs for
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during presentations is to narrow headings
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that we can focus on particular text
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excerpts.
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[Speaker 0]: Right, yeah. A lot of our presentations at
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EmacsConf are usually,
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especially the Org Mode ones,
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are done with Org Present.
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Sorry, I had someone talk to me in the ear.
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You know the problem with EmacsConf is that
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every year, you have to relearn a lot of
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skills, and by the time we finish,
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by Sunday evening, we are masters of it.
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And then we forget everything by the time the
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next year comes around.
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What I was going to say is that org-present
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is often used by people inside Emacs,
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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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Shornal.
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[Speaker 0]: Definitely. Alright, moving on to the next
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question. Is the triple-accolade syntax an
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[Speaker 2]: Org Mode core feature that I missed so
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[Speaker 0]: far, or did you program that?
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And thank you for the great 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, for now. You know,
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we always, you know, most of the people who
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show up to Emacs, especially talking about
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stuff that has to do with presentations or
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what they do in academia,
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you know, they always say,
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oh, but, you know, I couldn't have done all
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this, 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.
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And it's going to sound like I'm just trying
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to butter everyone up,
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but seeing a lot of the names in the IRC
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channel, people who have taught me so much on
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their YouTube channels and in their blog
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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 BigBlueButton.
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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,
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during the pandemic especially,
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when most of the courses were just being
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taught over Zoom by people sharing their
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screens.
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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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but I've got the intro for the next talk
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playing 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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So... Yeah, I think it's started.
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Sure. I got the times wrong,
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apparently, because of the little delay we
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had getting the audio fixed up.
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The good news is that we're still recording
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the talk right now and we still have James
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around. Obviously, James,
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you're no longer on being broadcast on
00:11:53.040 --> 00:11:53.440
General, but if you want to keep answering
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questions or if you want to,
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anyone in the room right now wants to ask you
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questions, feel free to do so.
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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,
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[Speaker 0]: sadly. great. And sorry,
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I'm a little tense, obviously,
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because I was not expecting this to happen.
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And that led to a very abrupt end to this
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discussion. But people afterwards on
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emacsmo.org slash 2023 slash talks will be
00:12:23.600 --> 00:12:24.020
able to find all the content here.
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So I'll have to leave now.
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Thank you so much, James,
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for doing the difficult task of opening up
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emacs-conf, And I'll probably see you later.
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[Speaker 1]: Thank you, Leo. Bye-bye.
00:12:54.380 --> 00:12:54.880
[Speaker 3]: On your, the external,
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the journal You were, you,
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you were using the tablet as a monitor,
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right? Touchscreen monitor,
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what's that?
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[Speaker 1]: program. Yes. That's exactly right.
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So it's a tablet, so it has a touchscreen.
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And so basically the functionality that that
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program provides is to be able to just mark
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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 3]: 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,
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and I'm kind of curious if it works well like
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as a wireless monitor with a tablet?
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Or how well it like you can use Emacs with it
00:14:04.020 --> 00:14:04.200
in a tablet mode? Or were you just or you
00:14:04.400 --> 00:14:04.900
just use
00:14:11.680 --> 00:14:12.040
[Speaker 1]: the tablet that I use is this is it it's just
00:14:14.820 --> 00:14:15.020
the Microsoft Surface and so it comes with a
00:14:18.200 --> 00:14:18.700
keyboard So you can take the keyboard off.
00:14:22.760 --> 00:14:23.260
But I use it with the keyboard as well.
00:14:25.240 --> 00:14:25.740
And I just.
00:14:31.000 --> 00:14:31.500
[Speaker 3]: You're cutting off right now.
00:14:33.680 --> 00:14:34.180
Audio.
00:14:45.660 --> 00:14:46.160
Your audio is cutting off right now.
00:15:31.740 --> 00:15:32.240
How about now? Now I can hear you.
00:15:33.820 --> 00:15:33.960
[Speaker 1]: How about now? I bumped the mute button on
00:15:37.420 --> 00:15:37.740
the mic. Yeah, so again,
00:15:38.680 --> 00:15:38.940
this is... I'm trying to figure out which
00:15:41.020 --> 00:15:41.520
[Speaker 3]: of the 16 mute buttons you used.
00:15:45.700 --> 00:15:46.200
[Speaker 1]: It's just the Surface Pro 3 that I got used.
00:15:52.920 --> 00:15:53.300
And it runs Emacs, I mean it runs GNU Linux
00:15:58.740 --> 00:15:58.980
really well. And the trouble is that the hard
00:16:01.900 --> 00:16:02.220
drive, you know, the SSD drive is small and
00:16:06.260 --> 00:16:06.420
the RAM is small, but it works for the
00:16:09.340 --> 00:16:09.640
purposes. Basically, if I had a couple
00:16:13.080 --> 00:16:13.260
thousand dollars, I could probably buy a
00:16:16.320 --> 00:16:16.560
touch screen machine or I could run
00:16:18.960 --> 00:16:19.200
everything on it and do the streaming and do
00:16:24.960 --> 00:16:25.460
the video capture and do the PDF markup.
00:16:27.980 --> 00:16:28.480
But since both of these are so,
00:16:31.720 --> 00:16:31.960
the hardware that I use is so old and cheap
00:16:33.640 --> 00:16:33.840
and weak, I'd have to split it across 2
00:16:33.840 --> 00:16:34.340
machines.
00:16:37.160 --> 00:16:37.660
[Speaker 3]: There's also a beauty in making the stuff,
00:16:39.720 --> 00:16:40.120
having specific purposes for specific things
00:16:43.840 --> 00:16:44.160
where it's just not, yeah,
00:16:47.980 --> 00:16:48.320
it's like, I don't want a smart TV that plays
00:16:52.360 --> 00:16:52.540
Netflix. I want a Smart TV that has all the
00:16:55.520 --> 00:16:55.760
smarts that I turn my smart TV into a TV
00:16:56.120 --> 00:16:56.620
monitor. I
00:17:01.020 --> 00:17:01.520
[Speaker 1]: Don't want to yeah Really?
00:17:04.526 --> 00:17:04.540
I I totally feel that ethic I totally feel
00:17:04.859 --> 00:17:05.359
that ethic.
00:17:13.619 --> 00:17:13.940
[Speaker 3]: Oh, on the some other things,
00:17:16.319 --> 00:17:16.440
like if you want you To do highlighting in an
00:17:18.560 --> 00:17:19.060
org mode document you can use org web tools.
00:17:20.680 --> 00:17:20.880
I wrote this in the notes But you can use org
00:17:23.560 --> 00:17:23.720
web tools to download a web page And then you
00:17:26.480 --> 00:17:26.980
can use org remark to start highlighting in
00:17:29.440 --> 00:17:29.700
the org mode web page And then because it's
00:17:30.600 --> 00:17:30.740
an org mode document now,
00:17:32.600 --> 00:17:33.100
[Speaker 1]: right
00:17:36.200 --> 00:17:36.280
[Speaker 3]: you can just edit it directly If you have If
00:17:38.300 --> 00:17:38.760
you want other people to join in on an emacs
00:17:40.520 --> 00:17:41.020
session you could use a package like,
00:17:44.540 --> 00:17:45.040
what's it called, crdt.el
00:17:49.920 --> 00:17:50.160
That will allow 2 people with 2 different
00:17:52.320 --> 00:17:52.820
Emacs configurations to edit the same buffer.
00:17:58.460 --> 00:17:58.580
What? And you have a host that can host a
00:18:00.620 --> 00:18:01.120
[Speaker 1]: Interesting.
00:18:05.500 --> 00:18:06.000
[Speaker 3]: buffer too. And they have 1 optional
00:18:07.700 --> 00:18:08.200
extension for org mode that will synchronize
00:18:10.140 --> 00:18:10.640
the folding of the org drawers.
00:18:14.260 --> 00:18:14.760
[Speaker 1]: Interesting, I will look into that.
00:18:21.620 --> 00:18:22.120
[Speaker 3]: Like having I don't like if you want students
00:18:24.780 --> 00:18:25.280
like you have H highlight line mode.
00:18:26.120 --> 00:18:26.620
These are just some ideas.
00:18:28.100 --> 00:18:28.420
It's like you can have like highlight line
00:18:31.040 --> 00:18:31.540
mode so people can easily see which line
00:18:32.900 --> 00:18:33.400
you're on cursor tracking.
00:18:36.680 --> 00:18:37.180
And then you can have other people join in,
00:18:40.960 --> 00:18:41.320
students, or yeah, that's just a possible
00:18:41.320 --> 00:18:41.820
idea.
00:18:49.660 --> 00:18:50.000
[Speaker 1]: Is there anyone else in the big blue button
00:18:51.680 --> 00:18:52.180
room who has a question?
00:19:03.000 --> 00:19:03.280
All right, I'm going to go over to the pad
00:19:05.140 --> 00:19:05.280
and see if there are any pending questions I
00:19:11.280 --> 00:19:11.780
can address. Thanks PlasmaStrike.
00:19:12.980 --> 00:19:13.480
Yep.
00:19:29.640 --> 00:19:30.060
[Speaker 2]: To be tangled into source code or woven into
00:19:32.720 --> 00:19:33.220
a documentation file, which could be PDF,
00:19:36.140 --> 00:19:36.640
could be Markdown, could be OpenOffice,
00:19:39.600 --> 00:19:40.100
could be a notebook format.
00:19:42.860 --> 00:19:43.260
This methodology was conceived by Donald
00:19:51.460 --> 00:19:51.940
Knuth in 1984. The main purpose of literal
00:19:54.480 --> 00:19:54.660
programming is not only to make code or
00:19:56.720 --> 00:19:57.220
documentation or output more manageable,
00:20:01.020 --> 00:20:01.220
but to allow humans to create a data story to
00:20:02.960 --> 00:20:03.460
be pieced from a single source.
00:20:06.140 --> 00:20:06.340
What you see on the slide on the left hand
00:20:08.880 --> 00:20:09.380
side is the story and code inside an org-mod
00:20:14.220 --> 00:20:14.440
file. The file starts with some
00:20:17.260 --> 00:20:17.760
documentation, then you write back down the
00:20:21.660 --> 00:20:22.080
code, and at the bottom you see an output
00:20:26.040 --> 00:20:26.500
file, which is not shown in the slide itself.
00:20:28.140 --> 00:20:28.440
In the middle, you have the source code,
00:20:33.840 --> 00:20:34.000
which is the result of tangling or opening a
00:20:36.400 --> 00:20:36.900
buffer inside offload.
00:20:38.680 --> 00:20:38.940
On the very right-hand side,
00:20:42.540 --> 00:20:42.840
we have a PDF. Actually,
00:20:44.100 --> 00:20:44.600
this is HTML, random.org.
00:20:48.120 --> 00:20:48.420
The very same file that you see in the memory
00:20:52.360 --> 00:20:52.600
language. So the humans look at some of this
00:20:54.600 --> 00:20:54.720
code, and the machines look at other parts of
00:20:57.600 --> 00:20:58.040
the code. I actually did all my programming
00:20:59.760 --> 00:21:00.260
in the literate way even in the early 1990s,
00:21:02.720 --> 00:21:02.980
not using OrgMode, which didn't exist yet,
00:21:05.660 --> 00:21:06.160
but using Norman Ramsey's NoWeb preprocessor.
00:21:09.220 --> 00:21:09.720
They still use it inside Org Mode today.
00:21:11.400 --> 00:21:11.900
This preprocessor, NoWeb,
00:21:14.260 --> 00:21:14.480
allows you to tangle code from within an Org
00:21:16.020 --> 00:21:16.360
Mode file that is a self-standing file,
00:21:18.320 --> 00:21:18.820
much like Org Mode's edit functions,
00:21:21.520 --> 00:21:21.860
which export code blocks into buffers in
00:21:23.100 --> 00:21:23.600
whatever language the code blocks.
00:21:28.260 --> 00:21:28.760
In data science, these interactive notebooks,
00:21:30.900 --> 00:21:31.400
in 1 of the interpreted languages,
00:21:32.980 --> 00:21:33.400
like Julia, Python, or R,
00:21:36.900 --> 00:21:37.040
dominate. The basic technology is that of
00:21:39.120 --> 00:21:39.340
Jupyter notebooks, which take their name from
00:21:42.540 --> 00:21:42.900
Julia, Python, and R. And these notebooks use
00:21:43.780 --> 00:21:44.200
a spruce-stuffed shell,
00:21:47.440 --> 00:21:47.860
for example, IPython, and an option to add
00:21:52.540 --> 00:21:52.940
SQL cells. Alt mode inside Emacs has a large
00:21:55.840 --> 00:21:56.260
number of advantages. Some of them are listed
00:21:56.980 --> 00:21:57.480
here over these notebooks.
00:21:59.160 --> 00:21:59.660
2 of these stand out particularly.
00:22:02.860 --> 00:22:03.360
Different languages can be mixed,
00:22:05.140 --> 00:22:05.640
as shown in the image.
00:22:07.200 --> 00:22:07.700
While in Jupyter notebooks,
00:22:10.680 --> 00:22:10.880
a notebook is limited to running a kernel in
00:22:13.940 --> 00:22:14.440
1 language only. The content of the notebook,
00:22:16.240 --> 00:22:16.560
its document code or output part,
00:22:18.520 --> 00:22:18.680
can be exported in a variety of forms.
00:22:18.735 --> 00:22:18.790
[Speaker 3]: We are
00:22:19.640 --> 00:22:19.840
[Speaker 2]: currently the only person in this
00:22:21.020 --> 00:22:21.520
conference... ...To share with others,
00:22:23.660 --> 00:22:24.160
to use one's work in different reports...
