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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. Ridley @ a safe distance‏ @11rcombs 11 Jun 2020
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      Replying to @marcan42

      …wait, how does one even manage to have chroma siting problems in 4:4:4?

      1 reply 0 retweets 6 likes
    2. Hector Martin‏ @marcan42 11 Jun 2020
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      Replying to @11rcombs

      EXACTLY

      1 reply 0 retweets 5 likes
    3. Ridley @ a safe distance‏ @11rcombs 11 Jun 2020
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      Replying to @marcan42

      this sounds like it might be somehow either an OBS bug or a libavcodec bug? like, I cannot fathom a way for this to be an issue with the ProRes format itself, you couldn't fuck that up if you tried

      1 reply 0 retweets 2 likes
    4. Hector Martin‏ @marcan42 11 Jun 2020
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      Replying to @11rcombs

      I bet at some point it's going through yuv420p, badly.

      1 reply 0 retweets 3 likes
    5. Ridley @ a safe distance‏ @11rcombs 11 Jun 2020
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      Replying to @marcan42

      that or some 4:2:2 intermediate? (is it vertical, horizontal, or both?)

      1 reply 0 retweets 0 likes
    6. Hector Martin‏ @marcan42 11 Jun 2020
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      Replying to @11rcombs

      It might just be horizontal, so yeah...

      1 reply 0 retweets 0 likes
    7. Hector Martin‏ @marcan42 11 Jun 2020
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      Replying to @marcan42 @11rcombs

      Yeah. yuv422p *and* bad scaling? Looks like every second chroma sample gets dropped/clobbered with the first. qtrle top, prores bottom, via OBS. mpv/ffplay show the prores file properly (same as the top).pic.twitter.com/JOweWvAn61

      1 reply 0 retweets 3 likes
    8. Hector Martin‏ @marcan42 11 Jun 2020
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      Replying to @marcan42 @11rcombs

      Oh and there's definitely a colorspace conversion issue too.

      1 reply 0 retweets 3 likes
    9. Hector Martin‏ @marcan42 11 Jun 2020
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      Replying to @marcan42 @11rcombs

      Confirmed that it's a yuv444p16 problem. yuv444p works. yuv422p works as intended (better than that messed up yuv444p16 output)... but crashes OBS after a few source restarts. lol.

      1 reply 0 retweets 4 likes
    10. Hector Martin‏ @marcan42 11 Jun 2020
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      Replying to @marcan42 @11rcombs

      Opened a bug, we'll see what they say.https://github.com/obsproject/obs-studio/issues/3057 …

      1 reply 0 retweets 6 likes
      Hector Martin‏ @marcan42 11 Jun 2020
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      Replying to @marcan42 @11rcombs

      Apparently the problem was SWS_FAST_BILINEAR. I'm not sure if that's expected behavior or a swscale bug...

      5:23 PM - 11 Jun 2020
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      • Alexander W Mitchell Ridley @ a safe distance
      1 reply 0 retweets 2 likes
        1. Ridley @ a safe distance‏ @11rcombs 11 Jun 2020
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          Replying to @marcan42

          if you set the fast flags I feel like nothing's guaranteed quality-wise

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