David Goudou (2025-11-03 14:56 +0000):
> On 03 Nov 25 - 15:50, Landry Breuil wrote:
> > Le Mon, Nov 03, 2025 at 03:35:05PM +0100, Kirill A. Korinsky a écrit :
> > > On Mon, 03 Nov 2025 14:46:35 +0100,
> > > David Goudou <david.goudou@gmail.com> wrote:
> > > > 
> > > > here's the error i encountered:
> > > > 
> > > > [Child 95605, MediaDecoderStateMachine #1]
> > > > WARNING: Decoder=d9fd0a9c000 Decode error:
> > > > NS_ERROR_DOM_MEDIA_METADATA_ERR (0x806e0006):
> > > > file /usr/obj/ports/firefox-144.0.2/firefox-144.0.2/dom/media/MediaDecoderStateMachineBase.cpp:168
> > > > 
> > > > example test video: https://justdavid.org/x3kja9d680zf1.mp4
> > > > 
> > > > youtube does play fine for me too
> > > > 
> > > 
> > > I can play this video via ffplay and chromium. In firefox it says:
> > > 
> > > > No video with supported format and MIME type found.
> > > 
> > > ... it looks like a firefox bug, so added landry@ as CC
> > 
> > if the same video works w/ ffmpeg 6 then that's a regression from the
> > ffmpeg update used by firefox at runtime :)
> > 
> > (no, i wont be able to look into the details now)
> > 
> 
> can confirm working with ffmpeg 6

Firefox prints this on stderr:

[Child 55268, MediaDecoderStateMachine #1] WARNING: Decoder=5abed669600 state=DECODING_METADATA Decode metadata failed, shutting down decoder: file /usr/obj/ports/firefox-144.0.2/firefox-144.0.2/dom/media/MediaDecoderStateMachine.cpp:372
[Child 55268, MediaDecoderStateMachine #1] WARNING: Decoder=5abed669600 Decode error: NS_ERROR_DOM_MEDIA_METADATA_ERR (0x806e0006): file /usr/obj/ports/firefox-144.0.2/firefox-144.0.2/dom/media/MediaDecoderStateMachineBase.cpp:168