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comment by wasoxygen
wasoxygen  ·  73 days ago  ·  link  ·    ·  parent  ·  post: 0.2078795763



Devac  ·  73 days ago  ·  link  ·  

Do you want a proof of i^i ∈ ℝ or an interpretation of it in some physical context?

wasoxygen  ·  73 days ago  ·  link  ·  

An interpretation in some physical context sounds cool, especially if you can do it in words of two syllables or less.

Devac  ·  73 days ago  ·  link  ·  

Fuuuuuuck.

I've recorded forty minutes long explanation and camera froze less than a minute in. And people can't even blame it on Linux being shit, that was on Windows. "It has better multimedia support" my arse…

I'll scan my notes and add some commentary, but later. I'm too furious to deal with anything right now.

Anyway, if you want a short version/spoiler, it involved conformal mapping and a circle-shaped capacitor.

kleinbl00  ·  73 days ago  ·  link  ·  

Recording anything for 40 minutes is asking for trouble, and I've worked on 1-take films involving Red Epics and six figures worth of media.

Devac  ·  73 days ago  ·  link  ·  

I guess you are right on that one. Usually, I try (and mostly succeed) to stay under fifteen minutes with any such recordings, but this time I didn't even notice for how long I was talking.

To add insult to injury, it was probably the first time in a long while when I could pass as an eloquent speaker. Aside from a single 'um' at the beginning, it felt like this impromptu recording has been in rehearsal for weeks. No pauses, no need for corrections, nothing to show in the end. This was simply the straw that broke the camel's back, hence the (uncalled for) reaction.

kleinbl00  ·  73 days ago  ·  link  ·  

h.264, which is the protocol most cameras record to, isn't even synchronous. There's no mandated field length within the codec. Which means for those of us who record audio, h.264 will drift by at least a frame after less than 5 minutes of recording. More than ten minutes and you can be off by three frames or more. After that it's all kinda wooly; the video recording is dumping data where it fits and speeding up or slowing down to make the audio work. Meanwhile it's spitting out a secondary path for monitoring which Windows is playing with asynchronously as well. Linux is no better. Unless you've got a dedicated hard-coded time-synched recorder it's all spitting shit every which way and it'll drop frames, lock up, whatever. If you're using a webcam it doesn't much matter because we accept that webcams are going to be shit. But if you're recording, you're in for a bad time.

Devac  ·  73 days ago  ·  link  ·  

    h.264, which is the protocol most cameras record to, isn't even synchronous. There's no mandated field length within the codec. Which means for those of us who record audio, h.264 will drift by at least a frame after less than 5 minutes of recording. More than ten minutes and you can be off by three frames or more. After that it's all kinda wooly; the video recording is dumping data where it fits and speeding up or slowing down to make the audio work.

Thanks! I was vaguely aware of that, but never really noticed. As I said earlier, my recordings are usually under fifteen minutes. Plus I'm not recording my face, so it's not like I can realistically estimate how much my mouth and voice desync. Few frames here or there aren't much when discussing physics. But if what you say is true, forty minutes would probably look like complete shit. Hundred millisecond difference is probably bearable in my wannabe Khan Academy format, but extrapolating from your numbers it would get to be around full second(s) by the end. That's indeed too much.

    Meanwhile it's spitting out a secondary path for monitoring which Windows is playing with asynchronously as well. Linux is no better.

Hah. I know, codecs and their standards don't really depend on the OS (to my knowledge at least, I'll gladly be corrected). They can be harder to implement or port, but it's largely independent. That's, again, my annoyance showing.

But I'm not gonna lie, after years of people telling me that you can't do anything with video on Linux and the second ever recording that I made on Windows went tits up (and first wasn't really a success either)… I felt a kind of a vicarious pleasure at this failing. Lizard brain of sorts, I guess. Bit shame that at my expense though ;).

    If you're using a webcam it doesn't much matter because we accept that webcams are going to be shit. But if you're recording, you're in for a bad time.

If that's the case, are there any affordable solutions? Baring in mind that I live quite comfortably while making about 480-500 USD per month in total (that is stipends + tutoring) and the fact that in Poland most of the specialist electronics are about 10-30% more expensive on average. Would a mid-tier camera on a tripod recording on memory card cut it, or am I in a wrong ballpark?

No rush. I'm mainly just curious. It's not like I'm recording more than maybe two or three hours per month. That said, if I would get some sensible job for my senior year it wouldn't hurt me to get at least acquainted with quality video work and editing.

Thank you in advace!

kleinbl00  ·  73 days ago  ·  link  ·  

The cheapest thing to do is learn to cut every minute or so. Next time you watch a show on television, pay attention to how often they switch angles or change scenes. It's actually pretty atypical to go longer than six or seven seconds without cutting to a different angle.

I recognize that this approach doesn't work for streaming screencasts but if you can find places to stop and start it'll improve your flow and save you money.

wasoxygen  ·  73 days ago  ·  link  ·  

Oh, sorry to hear that, but thanks for making the effort. There is plenty at MathWorld to keep me occupied until old age.

Devac  ·  73 days ago  ·  link  ·  

Nah, sorry for raging here. It wasn't called for, and I want to apologise about this whole situation. But I'm not going to lie, it felt like a complete waste of time. It wasn't, I was enjoying all the time while I was talking, but just something broke inside me when I've launched the recording and saw how it suddenly stops refreshing the video. I wanted to believe that it was just something about this program. When it failed to deliver on different five media players, I was done.

After thinking for a moment I have one more thing to add that I did not flash out in my would-be recording. Roots of unity and their properties are not crucial but provide certain insights into operations on complex numbers.