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URL: https://www.youtube.com/watch?v=linlz7-Pnvw

Browser / Version: Firefox 98.0
Operating System: Windows 10
Tested Another Browser: Yes Chrome

Problem type: Something else
Description: Video stuttering heavily on high resolutions (eg: 8K), especially on higher speeds (eg: 2x)
Steps to Reproduce:
Steps taken: 1. Installed newest nightly firefox distribution from official site (https://www.mozilla.org/en-US/firefox/channel/desktop/#nightly); 2. Opened new window and typed in address for the 8K video (https://www.youtube.com/watch?v=linlz7-Pnvw), pressed enter; 3. Set video resolution to 8K, speed to 2x, and disabled sound and closed captions. Annotations remained active; 4. Played the video by clicking on the play button on the bottom-left corner. Stuttering started immediately, with very significant frame drops. Maximized screen. Stuttering got even worse.
Recorded on firefox profiler: https://share.firefox.dev/3qA6Csj

I've had this same issue on every Firefox stable version since at least 64.0 (64 bit), including the most recent version (66.0.1), all 64 bit. 30-fps video seems to take much longer to stutter, and the higher the resolution, the faster the problem shows up. On chrome and chromium-based browsers, the problem has yet to manifest itself.

Browser Configuration
  • None

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Closed: Moved
#98354

www.youtube.com - Video stuttering heavily on high resolutions (eg: 8K), especially on highe

Opened: 2022-01-17
Reporter: Pedro-Nardi
Comments: 3
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