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Paco

[Known Issue] Video Frame Rate Stuttering for specific codecs on older videos

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Some videos, especially videos with a lower view count uploaded in 2015 and earlier, are showing significant frame rate stuttering when watched at most Quality settings.

  • When checking the Stats for Nerds page, all impacted videos show one of three codecs -- avc1.4d400b, avc1.4d400c, or avc1.4d4016.
  • Videos from channels with large view counts typically use Google's VP9 codec, which is why bigger channels are not reporting this issue.
  • Changing the quality playback for these videos to 360p changes the codec and causes them to play back correctly without stuttering. Only 360p works; even lower quality settings use the bugged codecs and continue to stutter.
  • Temporary Workaround: These videos can be forced to permanently re-encode at all quality settings with a different codec by using the Enhancement module to save over the video (even if no changes are made). This is only a short-term workaround for your critical videos -- it doesn't work for very long videos (>5 Hours), and only 8 videos can be queued at a time for reprocessing this way. We will need YouTube's attention to address the underlying bug with these codecs.
  • The stuttering typically gets worse as a video progresses. Check your older videos for these codecs and skip ahead to see if you detect the stuttering. If you do, for now, use the Enhancement module to re-encode your most critical impacted videos.
  • This thread contains a detailed discussion on the issue with examples from multiple users and an Edit History as we were figuring out and isolating the problem.

 

UPDATE:

YouTube is aware of the issue and is working on a fix

 

source: reddit.com/r/youtube

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