1236806 - [Mac] Video and audio out of sync on integrated gpu

Status: RESOLVED WORKSFORME

(Core :: Audio/Video: Playback, defect, P2)

Description

[Benoit Girard (:BenWa)]

I've been noticing the video and audio falling out of sync a lot in the last few days on Nightly. It's particularly noticeable on this video here:

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

Comment 1

[Benoit Girard (:BenWa)]

I see a lot of frames being skipped in there. This is perhaps where the audio falls out of sync.

Comment 2

[Jean-Yves Avenard [:jya]]

can you right click on the video window and select Stats for Nerds when you're seeing the A/V sync issue and copy here.

When you saying A/V sync issue, does the video appears to play properly but not in sync with the audio (e.g. a constant delay between audio and video), or does the video appear frozen while audio continue playing then when video resumes it is in sync again only to freeze again?

Comment 3

[Benoit Girard (:BenWa)]

I think this might only occur with the Integrated GPU and not the discrete. My resolution is high and the Intel GPU is not strong enough.

I see the same frame stick on the screen for a bit (half a second worth or longer), then it jumps ahead and skips frame to 'catch-up' but the audio is now unsync.

I'll post the stats when I reproduce again.

Comment 4

[Anthony Jones (:ajones, :kentuckyfriedtakahe, :k17e)]

(In reply to Benoit Girard (:BenWa) from comment #3)
> My resolution is high and the Intel GPU is not strong enough.

Can you post the graphics section of about:support and tell us your monitor resolution?

Comment 5

[Benoit Girard (:BenWa)]

Attachment: about:support

Comment 6

[Benoit Girard (:BenWa)]

This is running at the 1920x1200 2x retina scaled down to the mac retina screen at 2880×1800.

Comment 7

[Benoit Girard (:BenWa)]

I tried forcing this as much as possible and I can't reproduce this. I'll re-open if I see this.