[FFmpeg-devel] [RFC] consider all mpeg4 tb_unreliable()

[Reimar Döffinger]

On Fri, Mar 06, 2009 at 04:23:25PM +0100, elupus wrote:
> I just ran into an avi file which contains a mpeg4 video stream with a
> time_base of 23.9.. This have been muxed into a 25fps avi, and the audio
> resampled to sync..
> 
> Now r_frame_rate for this file get's set to 23.9.. instead of the real
> framerate (at playback based on timestamps), 25 fps.
> 
> Forcing the codec to be considered as tb_unreliable() will work for the
> sample in question ( 25fpsVidConsidered24fps.avi in incomming ). 
> 
> But i'm not sure what other problems that might cause.
> 
> Any thoughs?

That the real issue here is container vs. codec frame rate, and the
container frame rate usually should be considered authoritative,
at least for containers like AVI.