1955841 - Video and Audio gets out of sync if 2x is used on youtube

Status: NEW

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

Description

[Joao Melo]

Steps to reproduce:

1- hold the mouse down in the video, for 2 or 3 seconds while it is playing, to trigger the 2x speed on the video
2- do it 3 to 10 times

Actual results:

the video will gradually be more and more out of sync

Expected results:

The video and audio should be in sync

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

[Mayank Bansal]

Thanks for reporting! To help diagnose this issue better, please can you:

1. Type "about:support" in Firefox and copy-paste its contents here
2. Does this reproduce in a clean profile or Troubleshoot Mode?
3. Capture a log when the issue occurs:

• In Firefox, ideally freshly started with no other tabs, go to about:logging in a new tab
• Select the Media preset
• Enable "stack traces for log messages"
• Click on "Set Log Modules"
• Click Start Logging
• Reproduce the bug
• Back on about:logging, click Stop Logging
• In the new tab that appears with the Firefox Profiler web application, in the top right click the button to upload the profile
• Make sure hidden threads are included and upload, then share the link here or send privately to a Mozilla developer
  -See https://paul.cx/public/about-logging-presentation.webm for a video walk-through

4. If this used to work in an earlier version of Firefox, please do a bisection to find the exact change that caused this (https://mozilla.github.io/mozregression/)

Comment 3

[Joao Melo]

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2. yes it does, tried both

3. https://share.firefox.dev/4ixUukp

4. Tried on Firefox 118 and 101 and still happen, it also happens on my totally different macOS machine

Comment 4

[Alice0775 White]

I can reproduce the issue on Nightly138.0a1 Windows11.

STR:

1. Open https://www.youtube.com/watch?v=wzE2nsjsHhg and play without loggin
2. Click hold to play at x2 speed, release mouse after a few seconds
3. Repeat step2 5-10 times

Regression window:
https://hg.mozilla.org/integration/autoland/pushloghtml?fromchange=c4339dd5c34f8b56fa479d303ce54062b43851a0&tochange=f85620f91901ee8e35d57ea4cfacf09c67096bd6

Suspect: Bug 1752345

Comment 5

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

Set release status flags based on info from the regressing bug 1752345

:padenot, since you are the author of the regressor, bug 1752345, could you take a look? Also, could you set the severity field?

For more information, please visit BugBot documentation.

Comment 6

[Paul Adenot (:padenot)]

Not sure that I have time for this right now, Jim can find an owner. Careful logging of various time values should show the where the problem is.

Comment 7

[Alastor Wu [:alwu]]

I can reproduce this as well, but have to do many times of 2x, and then the video would out of sync a little while playing 1x, but 2x playing fine. But this problem will be gone once you seek it.

Comment 8

[Paul Adenot (:padenot)]

(In reply to Alastor Wu [:alwu] from comment #7)

But this problem will be gone once you seek it.

Yes, in this case we recreate the whole thing so we effectively "reset" whatever issue was accumulating.

Comment 9

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

Set release status flags based on info from the regressing bug 1752345

Comment 10

[juraj.masiar]

This issue is much more visible if you are using Enhancer for YouTube™ which adds icon for quick speed change using mouse wheel.
And since I use it a lot, almost all videos I watch gets out of sync, even several times (I use seek to fix it, bit it's only a temporal fix). Also, it seems to affect AMD GPU users more.

Now that I think about it, this could fixed using extension - by detecting speed change and then executing something like:

document.querySelector('video').currentTime = document.querySelector('video').currentTime

Comment 11

[Yahhas]

Just came here to say that I've also had this issue for a while now on my PC with 6700xt. Seems to be something with the AMD GPUs because I get this with Linux and Windows on the same PC but don't have this on my M3 Macbook.

Comment 12

[juraj.masiar]

Attachment: Android example, 10x speed change causes huge delay.mp4

This affects also Android, I've noticed it on my tablet but I can reproduce it also in the Android emulator.
By changing speed 10 times in a row, the audio gets completely out of sync.
(it's the "hold to use 2x speed" feature of YouTube)