1946999 - Firefox 135 - Impossible to watch high-resolution videos

Status: UNCONFIRMED

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

Description

[Volodymyr Bykov]

User Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:135.0) Gecko/20100101 Firefox/135.0

Steps to reproduce:

Tried to watch a YouTube video (not a single one), but this one is a good example:

https://www.youtube.com/watch?v=4CSOwxhGvmY

Happens to many videos, mostly with a high resolution. It is literally impossible to surf YouTube. Switched to Chrome for now.

Actual results:

The video is choppy and stalls every second

Expected results:

The video should play smoothly.

Comment 1

[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 2

[az [:az]]

Hi, thanks for the report!

Is this behavior new for you? If so, when did it begin? Would you be able to share the contents of your about:support page?

Please check to see if you have hardware acceleration enabled. You can follow these instructions to enable hardware acceleration. If that does not fix the problem, please check to see if troubleshoot mode does. Your issue may also have already been resolved in nightly. Let us know if any of the above helps, and I'll take a look at your about:support as well.

Comment 3

[Volodymyr Bykov]

Attachment: Content of about:support

I believe this particular behavior started from this version. However, I saw some signs before the last update as well. Sometimes video gets stuck, and then the HTML video element flashes white. It looks like in such a situation the browser just re-creates the element and after the flash the video continues. Here is data you requested:

Comment 4

[Volodymyr Bykov]

I believe this particular behavior started from the current version. However, I saw some signs before the last update as well. Sometimes video gets stuck, and then the HTML video element flashes white. It looks like in such a situation the browser just re-creates the element and after the flash the video continues. I've attached the data you requested.

Comment 5

[az [:az]]

Thanks for the info! Could you please capture a profile with the choppy playback? To do so:

1. Start a fresh Firefox session with no other tabs.
2. Install the Firefox profiler: https://profiler.firefox.com/
3. Open Firefox, and go to the about:logging page.
4. Click Logging preset and choose Media Playback.
5. Click Start Logging.
6. Open a new tab and repeat the steps that cause the issue. Once you reproduce the issue, close the tab, then go back to about:logging and click Stop Logging.
7. The Firefox Profiler should launch itself automatically.
8. Click Upload Local Profile, then download the profile and upload it to Bugzilla, or paste the share link in the comment directly.

Video tutorials to get the logs are here: https://www.loom.com/share/24ea3a8e3a054c478de94643a0ea8620?sid=87b0ffaa-c4ea-43ce-8107-639f24b747a8 or: https://paul.cx/public/about-logging-presentation.webm)

Comment 6

[Volodymyr Bykov]

Attachment: Firefox 2025-02-12 20.21 profile.json.gz

Attached, please find the requested profile.

Comment 7

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

The severity field is not set for this bug.
:jimm, could you have a look please?

For more information, please visit BugBot documentation.