[Ffmpeg-devel] mov doesn't set FPS?

Rich Felker dalias
Sun Jul 24 13:07:36 CEST 2005

On Sun, Jul 24, 2005 at 12:31:11PM +0200, Ronald S. Bultje wrote:
> hi Michael,
> On Fri, 2005-07-22 at 17:25, Michael Niedermayer wrote:
> > On Friday 22 July 2005 17:05, Ronald S. Bultje wrote:
> > > libavformat/mov.c in CVS has two places where it sets time_base, both
> > > commented out. The result is that the FPS is not set. With the instance
> > > in mov_read_stsd() not commented out, it works fine (_stts() isn't
> > > always called, it seems).
> > >
> > > Simple patch attached (or is there a reason for this?)
> > 
> > rejected, setting the time_base to fixed 1/25 just cant be correct, can it be? 
> > not to mention that you mix codec and demuxer time_bases
> Whoops, that's young enthusiasm, I'm affraid, sorry. Attached is a
> somewhat more intelligent patch that actually specifies the correct
> framerate for the few movies that I tested.
> What do you mean with codec/demux time-base? I think that in mov, those
> are the same, at least for video tracks, given the values of time_scale
> for the video tracks.

The demuxer has absolutely no business setting the _codec_ timebase.
It can only touch the demuxer timebase. At least that's what I think
Michael was saying.


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