1961098 - Video playing is erratic - some frames looping/stuttering

Status: RESOLVED DUPLICATE of bug 1960950

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

Description

[Julien G]

When playing a video (whether on Twitch, Mastodon, YouTube), the sound is OK but the frames kind of "loop" forward resulting in a "choppy" stream.
I'll update a capture if possible.

Edit: OS : Windows 10 22H2 19045.5737
Firefox 139.0a1 (2025-04-16) (64 bits)
Still applies in 139.0a1 (2025-04-17) (64 bits) (when I did the about:support export)

I don't know for sure when Nightly updated last time on my machine, but this didn't happen yesterday

Comment 1

[Julien G]

Attachment: twitch playing on Nightly

Comment 2

[Julien G]

Attachment: mastodon.mp4

Post available at https://front-end.social/@eeeps/114350266233817334

Comment 3

[BugBot [:suhaib / :marco/ :calixte]]

The Bugbug bot thinks this bug should belong to the 'Core::Audio/Video: Playback' component, and is moving the bug to that component. Please correct in case you think the bot is wrong.

Comment 4

[Julien G]

Following @julienw advice: here's a profiler's profile from a clean profile https://share.firefox.dev/4jp8mO0 after playing a YouTube video

Please let me know if something is missing

Comment 5

[Julien G]

Attachment: Export of aboutsupport

An export from about:support (raw) per :julienw: guidance

Comment 6

[Alastor Wu [:alwu]]

Seems like bug 1960950.