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marcan42's profile
Hector Martin
Hector Martin
Hector Martin
@marcan42

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Hector Martin

@marcan42

If it ain't broke, I'll fix it! I'm porting Linux to Apple Silicon Macs at @AsahiLinux. http://patreon.com/marcan  | http://github.com/sponsors/marcan 

Tokyo, Japan
marcan.st
Joined May 2009

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    1. Hector Martin‏ @marcan42 10 Apr 2020
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      Replying to @tumult @jcelerie

      And h.264 is probably over 20 times more complex to decode than the older codec. Times 30 you're at 600. And nobody is putting exact seek into browser players because it's not going to work for HD video which multiplies the CPU usage again.

      1 reply 0 retweets 5 likes
    2. cancel/tumult‏ @tumult 10 Apr 2020
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      Replying to @marcan42 @jcelerie

      i don't understand what the times 30 is here

      1 reply 0 retweets 0 likes
    3. Hector Martin‏ @marcan42 10 Apr 2020
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      Replying to @tumult @jcelerie

      h.264 frames can depend on an infinite number of frames before them. A more common setting is 30. That means decoding frame 30 requires decoding frames 1-29 too. So you need 30 times the CPU power to decode any *random* arbitrary frame in the time it normally takes to decode one.

      2 replies 0 retweets 8 likes
    4. Hector Martin‏ @marcan42 10 Apr 2020
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      Replying to @marcan42 @tumult @jcelerie

      Try encoding your video on the left with GOP size 1 and I bet it'll seek as smoothly as the video on the right.

      1 reply 0 retweets 2 likes
    5. Hector Martin‏ @marcan42 10 Apr 2020
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      Replying to @marcan42 @tumult @jcelerie

      (It will also be much larger, but still smaller than the video on the right since h.264 is still going to be a better codec even in intra only mode)

      2 replies 0 retweets 1 like
    6. cancel/tumult‏ @tumult 10 Apr 2020
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      Replying to @marcan42 @jcelerie

      ok but here's a non-defective video player doing it just fine despite you saying it's impossible (same video as on the left in my original) this is running on 8 year old hardware on mac os 10.12pic.twitter.com/GApgFA82Oe

      5 replies 6 retweets 57 likes
    7. Attie Grande‏ @attiegrande 11 Apr 2020
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      Replying to @tumult @marcan42 @jcelerie

      @marcan42 didn't say "it's not possible" but rather "it's not possible to make scrubbing universally responsive" Modern considerations go further than those from 20+ years ago, and will skew heavily towards reduced power usage.

      2 replies 0 retweets 4 likes
    8. cancel/tumult‏ @tumult 11 Apr 2020
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      Replying to @attiegrande @marcan42 @jcelerie

      It doesn't need to scrub a 90 hour 8k video file. It's just a regular, short video file, at low resolution. It fails at it.

      1 reply 0 retweets 0 likes
    9. Hector Martin‏ @marcan42 11 Apr 2020
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      Replying to @tumult @attiegrande @jcelerie

      Scrubbing a 90 hour 8k video file visually smoothly takes *less CPU* than scrubbing an 8 second 480p file at libx264 default settings, because non-exact seeks don't matter when your video is 90 hours long.

      1 reply 0 retweets 1 like
    10. cancel/tumult‏ @tumult 11 Apr 2020
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      Replying to @marcan42 @attiegrande @jcelerie

      The 8 second video can be completely decoded into memory easily. It's the codec is irrelevant at that point.

      1 reply 0 retweets 0 likes
      Hector Martin‏ @marcan42 11 Apr 2020
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      Replying to @tumult @attiegrande @jcelerie

      That 8 second video takes 300MB of memory to completely decode into RAM. Do you seriously think it's acceptable for a browser to eat 300MB of RAM for every video you might play or embed into a webpage?

      7:03 AM - 11 Apr 2020
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      1 reply 0 retweets 1 like
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        2. Hector Martin‏ @marcan42 11 Apr 2020
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          Replying to @marcan42 @tumult and

          Where do you draw the line? Are we decoding 80 second long 480p videos into 3GB of RAM? Stop and think about the nonsense you're asking the browser to do for a second.

          1 reply 0 retweets 3 likes
        3. cancel/tumult‏ @tumult 11 Apr 2020
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          Replying to @marcan42 @attiegrande @jcelerie

          I'm not playing a bunch of videos at the same time. I'm playing one video, in one tab. If I was playing multiple videos, then it could just unload the ones it doesn't need. Or only do it when I start scrubbing.

          2 replies 0 retweets 0 likes
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