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

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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

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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.

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[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

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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.

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[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...