[vlc] Re: Problem playing MPEG-PS files with mpeg4video

[Gildas Bazin]

On Wednesday 26 January 2005 08:58, Nico Sabbi wrote:
> Måns Rullgård wrote:
> >Nico Sabbi <nsabbi at tiscali.it> writes:
> >>Gildas Bazin wrote:
> >>
> >>>Ok, the main problem here is that we don't have access to the frame
> >>>rate information for this kind of streams so we can't really
> >>>interpolate the timestamps, thus we rely on each frame having at
> >>>least a DTS.
> >>>Do you know if there's a way to find out the frame rate info ?
> >>>      
> >>>
> >>this is what I implemented for mplayer:
> >>
> >>take 3 video frames and store
> >>- from the vol header the time_resolution
> >>- from the vop headers the 3 time_increments
> >>
> >>calculate the minimun difference between the 3 time_increments, say diff
> >>fps = timeinc_resolution / diff
> >>
> >>This method works also when there are b-frames because they have to be
> >>in the right order, e.g.
> >>    
> >
> >You could also be nice to decoder and store the frame rate in the
> >PSM.  Have you tried whether VLC doing so makes VLC any happier?
> >
> >
> VLC doesn't seem to be able to mux mpeg4 in mpeg-ps: the resululting files
> contain only audio.
> It would be nice to describe the framerate with a descriptor, but which?
> 

Thanks for the time_increment trick. I'll implement that ASAP.
I just managed to get hold on an ISO 14496-2 draft and apparently it is also 
possible to store the framerate in the VOL (the fixed_vop_time_increment 
field) so maybe you should consider using this to make things simpler ?

As for the MPEG PS muxer in VLC, you're quite right that it doesn't support 
MPEG4 yet.

--
Gildas

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