1368063 - (yuv444) Video with YUV444 chroma subsampling can't be played back

Status: RESOLVED WONTFIX

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

Description

[(no longer active)]

See this link: https://bugzilla.mozilla.org/attachment.cgi?id=8871594

web console says:

Media resource https://bug1367970.bmoattachments.org/attachment.cgi?id=8871594 could not be decoded, error: Error Code: NS_ERROR_DOM_MEDIA_FATAL_ERR (0x806e0005)
Details: mozilla::SupportChecker::AddMediaFormatChecker(const mozilla::TrackInfo&)::<lambda()>: Decoder may not have the capability to handle the requested video format with YUV444 chroma subsampling.

Comment 1

[Jean-Yves Avenard [:jya]]

We don't support YUV444 at this stage. 

If h264 probably never as we rely on systems decoders.

Comment 2

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

Doesn't play on Safari.

Comment 3

[Akkana Peck]

YUV444 chroma subsampling seems to be some sort of default when making videos with ffmpeg -- I made one with "ffmpeg -i img%2d.png -filter:v "setpts=6.0*PTS" output.mp4" and firefox can't play it. I'm not finding much online about how to turn off this YUV444 thing that firefox can't handle. 

Chromium and Python's QtWebEngine can play the video; I'm not sure what "systems decoders" means in this context but I clearly have the libraries needed both to encode and decode this video.

Comment 4

[Jean-Yves Avenard [:jya]]

While ffmpeg can decode them, neither windows WMF decoder nor Apple's one can.
For coonsistency sake, we've disabled them on Linux too.

If you want to play yuv444 video, prefer a free codec such as vp9 for which we can provide decoder.

Comment 6

[Hadrien Nilsson]

When attempting to read such a file, maybe it would be nice to write on the screen, or in the console, that the format is voluntarily unsupported/disabled (and will never be supported)? Currently the message on screen says the file is corrupt.

That would help people like me to avoid loosing time thinking there is an issue in Firefox, and start looking on the ffmpeg side.

I think a better message would also help regarding people perception of Firefox, because that video format works fine on Chrome.

Comment 7

[Ben Wong]

(In reply to Akkana Peck from comment #3)

YUV444 chroma subsampling seems to be some sort of default when making
videos with ffmpeg -- I made one with "ffmpeg -i img%2d.png -filter:v
"setpts=6.0*PTS" output.mp4" and firefox can't play it. I'm not finding much
online about how to turn off this YUV444 thing that firefox can't handle.

For future reference for people who stumble upon this Firefox bug, the solution is to add "-pix_fmt yuv420p" in your ffmpeg command line.

By the way, it is a shame that Firefox shows nothing for yuv444 videos. It makes it look like a bug. It'd be nice if instead it showed a message explaining the problem, "Proprietary video format. Firefox will not fix. Please encode video using an open standard (VP9). FFmpeg users may create mp4's using -pix_fmt yuv420p."

Comment 8

[John Nagle]

Amusingly, one site suggests, after detecting this failure,using the Brave browser.

Comment 12

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

Setting an alias on this since it comes up with some regularity and I keep needing to find the bug.

Comment 16

[Darkspirit]

Chrome on Win10 and Linux is able to play it.
Chromium on Linux is able to play it.
Chromium on Win10 won't load the video.
Old Edge: Decode Error
Edgium (Chrome repeatedly freezes on Edge's download page and shows a popup asking to close the page, I had to use my regular Nightly to successfully download it: But Edge installer itself doesn't download more than ~20%): uninstallable, untestable 3:)