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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 Jun 2020
      • Report Tweet
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      OBS tip: if you want to use video sources (or Stinger wipes) with pixel-perfect display and alpha channels, use the ffv1 codec. It supports RGBA, so it plays well with PNGs and other RGB content. ProRes 4444 on the other hand has some nasty chroma siting issue.

      2 replies 6 retweets 40 likes
    2. 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
    3. Hector Martin‏ @marcan42 11 Jun 2020
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      Replying to @11rcombs

      EXACTLY

      1 reply 0 retweets 5 likes
    4. 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
    5. 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
    6. 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
    7. 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
    8. 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
    9. 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
    10. 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
      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 …

      1:05 AM - 11 Jun 2020
      • 6 Likes
      • Alexander W Mitchell Erika CodeAsm | Panda 🐼 Duckbuster Jessica 🌙 Ridley @ a safe distance
      1 reply 0 retweets 6 likes
        1. New conversation
        1. 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...

          1 reply 0 retweets 2 likes
        2. 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

          0 replies 0 retweets 1 like
          3. End of conversation

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