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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 Dec 2020
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      I ended up spending a few more hours debugging OBS last night, and this is what I came up with. The previous bugfix fixed a pathological bug that broke audio persistently, but this fixes the underlying problem that allows that to happen at all.https://github.com/obsproject/obs-studio/pull/3863 …

      2 replies 9 retweets 94 likes
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    2. Hector Martin‏ @marcan42 10 Dec 2020
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      More info in the PR description, but on a more personal side: when I first ran into this, and reported it upstream months ago, the OBS devs said "Max audio buffering reached!" was the problem. That warning was treated as some kind of catastrophic, restart-OBS-to-fix-it issue.

      1 reply 0 retweets 13 likes
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    3. Hector Martin‏ @marcan42 10 Dec 2020
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      It seemed it was just accepted that buggy or misbehaving audio sources could cause that situation, and when they did, all of OBS's audio processing was expected to stop working properly, and you had to restart the whole app.

      1 reply 0 retweets 9 likes
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      Hector Martin‏ @marcan42 10 Dec 2020
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      This always rubbed me the wrong way. First, because I *knew* from logs that I had gotten that error *hours* before the stream actually fell over. Second, because something is clearly wrong if a buffer never shrinks, can only grow, and once it reaches a max your app falls over.

      10:57 PM - 10 Dec 2020
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      • Hazelesque, but ✨festive✨ Nathan Vander Wilt woofoo alex sam ohzee Jessica 🌙 Kelly Clowers Tobias Kern
      1 reply 0 retweets 17 likes
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        2. Hector Martin‏ @marcan42 10 Dec 2020
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          Obviously if multiple audio sources cannot be reconciled in time due to time slip, *some* audio drop-outs need to happen. But they should neither affect everything globally, nor cause a persistent problem forever.

          1 reply 0 retweets 10 likes
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        3. Hector Martin‏ @marcan42 10 Dec 2020
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          Now I know that it was just another dumb bug. The buffer size increase codepath corrects those slipping sources, but once that no longer runs or sources slip too much, OBS's audio mixing code just... couldn't deal with them, instead breaking entirely.

          1 reply 0 retweets 8 likes
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        4. Hector Martin‏ @marcan42 10 Dec 2020
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          So the patch just makes it detect that situation and drop late audio from that source (and possibly reset it to pending) before the whole audio mixing tree gets poisoned by audio data from the past. And now everything is fine.

          2 replies 0 retweets 26 likes
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        5. Hector Martin‏ @marcan42 10 Dec 2020
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          FWIW, this particular bug has been basically known as "the bug that has crashed every long-running DJ (or similar RTMP re-streaming) show at least once" within the community. I'm very happy to see it gone. Or at least I hope so anyway. We'll see at @AnimeltUP! this Sunday!

          1 reply 3 retweets 45 likes
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        6. End of conversation

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