[Bug 750794] Lipsync problem using mp4mux with late v4l2src

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=750794

--- Comment #3 from Thiago Sousa Santos <thiagossantos at gmail.com> ---
(In reply to Jean-Michel Hautbois (jmleo) from comment #2)
> (In reply to Thiago Sousa Santos from comment #1)
> > Does the video at the first buffer represents the 0.3s or is it for the 0s
> > but is being pushed late (latency)? In another words, are the timestamp on
> > the video buffers correct?
> 
> The video corresponds to the 0 but is timestamped at 0.3 because of start
> latency.

I guess this is the problem, it should have been timestamped as 0, there is no
way from the muxer point of view to differentiate that the 0.3 should be mapped
to 0 or that it is indeed to 0.3.

> 
> > 
> > The edit list in qtmux is used, among other things, to represent late
> > streams. Can you share a problematic file that you muxed for further
> > investigation?
> 
> Will try to do that tomorrow. Any preference on where to store it ?

No, just store wherever you can provide a link to us.
A GST_DEBUG=6 log would also help understanding the problem.

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