1960950 - Stuttering in Firefox 139.0a1 (2025-04-16) (64-bit) when watching videos

Status: RESOLVED FIXED

(Core :: Graphics, defect)

Description

[Tarek El-Eter [:Tarek]]

Attachment: Video evidence of stuttering

My firefox nightly 139.0a1 (2025-04-16) (64-bit) on Windows 11 24H2 is stuttering when watching videos on youtube, linkedin etc

Comment 1

[Tarek El-Eter [:Tarek]]

https://share.firefox.dev/4cztU80

Comment 2

[Ted Campbell [:tcampbell]]

I'm seeing the same effect and MozRegression points me to Bug 1959856

Comment 3

[Alastor Wu [:alwu][PTO 5/15-5/18]]

Per comment2, Sotaro, could you take a look on this? Thanks!

Comment 4

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

Set release status flags based on info from the regressing bug 1959856

Comment 5

[Sotaro Ikeda [:sotaro]]

Hi :Tarek, can you attach about:support to this bug?

Comment 6

[Sotaro Ikeda [:sotaro]]

With pref media.wmf.zero-copy-nv12-textures = false, I could easier to reproduce the problem with the following STR with Win11 PC with NVIDIA GPU. I could not reproduce the problem with Win PCs with Intel GPU.

https://bugzilla.mozilla.org/show_bug.cgi?id=1817617#c22

Comment 7

[Sotaro Ikeda [:sotaro]]

removed

Comment 8

[Sotaro Ikeda [:sotaro]]

removed

Comment 9

[Tarek El-Eter [:Tarek]]

Attachment: ok

Comment 10

[Tarek El-Eter [:Tarek]]

Attachment: about:support data part 2

Comment 11

[Sotaro Ikeda [:sotaro]]

(In reply to Sotaro Ikeda [:sotaro] from comment #6)

With pref media.wmf.zero-copy-nv12-textures = false, I could easier to reproduce the problem with the following STR with Win11 PC with NVIDIA GPU. I could not reproduce the problem with Win PCs with Intel GPU.

https://bugzilla.mozilla.org/show_bug.cgi?id=1817617#c22

It seemed that recent change to WebRender seemed to block to use video overlay. can_promote_to_surface() was failed.

Comment 12

[Ted Campbell [:tcampbell]]

Attachment: tcampbell - about:support - Intel Gen 12 Arc graphics

I am seeing the same visual problem with integrated Intel graphics. about:support attached.

Comment 14

[Chris Peterson [:cpeterson]]

FWIW, I'm only able to repro this bug when using gfx.webrender.software pref = true (SW-WR).``

Comment 15

[Ted Campbell [:tcampbell]]

I'm seeing stuttering on AV1, H264, H265, but not having issues on VP8, VP9. Seeing in both video playback and WebRTC scenarios. On Intel 12th Gen integrated graphics. Can we consider a backout of the offending patch?

Comment 17

[Sotaro Ikeda [:sotaro]]

OK, I am going to create a patch to disable it.

Comment 18

[Sotaro Ikeda [:sotaro]]

On intel gen12, blocking nsIGfxInfo::FEATURE_REUSE_DECODER_DEVICE seemed to affect to the problem.

https://searchfox.org/mozilla-central/rev/0383ce6fe9579f345529b06170caaeb386ebc7c2/widget/windows/GfxInfo.cpp#1804

Comment 19

[Sotaro Ikeda [:sotaro]]

Attachment: Bug 1960950 - Disable FenceD3D11 handling to hardware decoded video

Comment 20

[Pulsebot]

Pushed by [e-mail]:
https://hg.mozilla.org/integration/autoland/rev/48cf37821c67
Disable FenceD3D11 handling to hardware decoded video r=gfx-reviewers,lsalzman

Comment 22

[Ted Campbell [:tcampbell]]

Confirming that the current Windows Shippable builds on autoland that include this patch resolve my Intel 12th Gen issues. Thanks!

Comment 23

[Serban Stanca [:SerbanS]]

https://hg.mozilla.org/mozilla-central/rev/48cf37821c67

Comment 26

[Tarek El-Eter [:Tarek]]

(In reply to Sotaro Ikeda [:sotaro] from comment #5)

Hi :Tarek, can you attach about:support to this bug?

Replying to disable needinfo alerts

Comment 27

[Sotaro Ikeda [:sotaro]]

I found the problem of fence handling in the following functions during Bug 1964219.

• D3D11TextureData::Unlock()
• D3D11TextureData::IncrementAndSignalWriteFence()