1521769 - MP4 2D-4K video is jerky

Status: NEW

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

Description

[Camelia Badau [:cbadau], Release Desktop QA]

Attachment: aboutSupport.txt

Affected versions

• DevEdition 66.0b1 (20190121133415)
• latest Nightly 66.0a1 (2019-01-21)
• Firefox 45.3.0esr
• Firefox 65.0 RC

Affected platforms

• Windows 7 x64
• Windows 10 x64
• Ubuntu 18.04 x64

Steps to reproduce

1. Go to the following mp4 sample: http://distribution.bbb3d.renderfarming.net/video/mp4/bbb_sunflower_2160p_60fps_normal.mp4

Expected result

• The video is loaded and played back correctly.

Actual result

• The video is jerky.

Regression range

• This is not a recent regression since the issue is reproducible in Firefox 15.0a1. I will determine if this is a regression ASAP.

Additional notes

• We reproduced the issue on machines with NVIDIA GeForce 210 and ATI Radeon 3000.
• Please see about:support details in the "aboutSupport.txt" attachment.

Comment 1

[Michael Froman [:mjf]]

Jean-Yves, any thoughts on who should take a look at this?

Comment 2

[Camelia Badau [:cbadau], Release Desktop QA]

I think this is NOT a regression since the issue is reproducible in Firefox 21 (which is the first build where video is played in Firefox browser without using VLC web plugin or another third-party application). In Firefox 15.0a1, the issue is reproduced, but the video is opened using VLC web plugin.

Comment 3

[Alexandru Trif, QA [:atrif]]

The issue is also reproducible using Firefox 67.0a1 (20190315093917) and 60.6.0esr (20190313191546) on macOS 10.14 using the 3d 4k video where massive stuttering appears when playing the video.

Comment 4

[Simona Badau]

This issue is also reproducible on Ubuntu 16.04 when using the latest Nighlty 71.0a1 (20190912215412).

Comment 5

[Bryce Seager van Dyk [:bryce] (he/him) - Not reading bugmail]

If this is still an issue it would be useful to capture a profile in Nightly with the Firefox profiler + the Media preset, then to share it and post the link on this bug.