1725554 - youtube broken av1 video playback, blurry, patchy with colors off av01.0.00M.08

Status: RESOLVED WORKSFORME

(Core :: Audio/Video: Playback, defect, P3)

Description

[Karl Dubost💡 :karlcow]

Attachment: safari tech preview right, firefox nightly center, edge canary right

1. Go to https://www.youtube.com/watch?v=vbLB2l9tj5g
2. play

Expected:
play with normal colors

Actual:
Patchy, Ghost colors,

Note:

• no issue in Safari and Edge. (see screenshot)
• Codecs: av01.0.00M.08 (395) / opus (251)
• color bt/709
• happening on windows10 and macos

Comment 1

[Alastor Wu [:alwu]]

I can reproduce this on all plaftforms, and I see the same issue happening on Chrome as well. So I guess the problem might be in the dav1d library? Jon, I saw you touched the DAV1DDecoder.cpp before and I wonder if you have any thought about this issue.
Thank you.

Comment 2

[Jon Bauman [:jbauman:]]

I couldn't reproduce on macOS with 92.0a1 (2021-08-07), 93.0a1 (2021-08-09), 93.0a1 (2021-08-17) or 92.0b1, so it's hard for me to investigate further.

Assuming you can reproduce, to determine if it's an issue with the dav1d library, one thing to try would be setting media.av1.use-dav1d in about:config to false.

Comment 3

[Jon Bauman [:jbauman:]]

Oh, and the recent changes to DAV1DDecoder.cpp [1] [2] shouldn't have any effect on video playback; they were just centralizing some colorspace logic, but the behavior should be the same.

Comment 4

[Karl Dubost💡 :karlcow]

Interesting I can't reproduce today.
mozregression --find-fix --bad 2021-08-12 --good 2021-08-17

and this doesn't give anything good. So probably a corrupted video on YouTube servers. Youtube had a very bad time the last couple of days.