1887512 - 4:2:2 VP9 videos do not display correctly on arm64 macOS

Status: UNCONFIRMED

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

Description

[foxt]

Attachment: broken_colour.png

User Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:124.0) Gecko/20100101 Firefox/124.0

Steps to reproduce:

Attempt to play a 4:2:2 encoded VP9 video in Firefox 124.0.1 on a M1 Max based computer running macOS 14.3.1

For example, use the following command:
ffmpeg -i /Users/foxt/Downloads/BigBuckBunny_320x180.mp4 -pix_fmt yuv422p video.webm

Actual results:

The video did not render correctly. It appears to me that the luma channel is rendered correctly, but the chroma channel is scaled up 2x vertically.

Expected results:

The video shows with correct colours.

Comment 1

[foxt]

Attachment: video.webm

Comment 2

[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 4

[foxt]

Hi Jim,
Don't want to be a bother, but that other bug seems different? The bug 1325847 seems to be 422 H.264 playback on Windows Intel not working at all, whereas this bug is 422 VP9 on Apple Silicon on macOS playing but having warped colours?

Thanks

Comment 5

[Jim Mathies [:jimm]]

I can reproduce this on my test mac.

Comment 6

[C.M.Chang[:chunmin]]

Maybe there are something wrong in some color-related settings in AppleVTDecoder?

Comment 7

[C.M.Chang[:chunmin]]

I plan to work on 422 (and 444) in the future. I can take it now, but feel free to steal it if anyone knows what's going on.
IIRC, 422 is not really popular, so I am going to set this S4.