1789881 - Google Meet background video experiences black frame or stutter at video loop point

Status: RESOLVED DUPLICATE of bug 1262276

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

Description

[Jim Mathies [:jimm]]

STR:

1. you need to be opted into the background blur feature (mozilla graphics and media accounts)
2. starts a meet browser session by yourself
3. choose the enhanced visual effects option
4. choose the custom video background button
5. select a good mp4 for testing. For example -

https://www.pexels.com/video/beach-with-clear-blue-water-3089895/

result: You may notice a brief black frame or stutter at the video loop point.

Comment 1

[Jim Mathies [:jimm]]

Note this is incredibly subtle. I'm testing on a five year old laptop and I barely see it.

Comment 2

[Jim Mathies [:jimm]]

Attachment: PXL_20220908_164856898.mp4

Comment 3

[Alastor Wu [:alwu]]

Quick update, by my investigation so far, I think this is a racing issue between "uploading the texture" and "media element's ready state update". The root cause is this part, (spec here) and I already confirm that the issue (black frame) would be fixed if I remove this part (but that is not a solution, I just want to make sure where the problem is)

Implementing bug 1262276 would help, and I am also considering if there is other quick fix we can do for this issue.

Comment 4

[Alastor Wu [:alwu]]

I can confirm that my patches in bug 1262276 can fix this issue. I played looping video as background around ~100 times and didn't see any black frame.