[vlc-devel] Re: Mpeg ps test results

Gildas Bazin gbazin at altern.org
Sat Mar 19 10:30:42 CET 2005

On Friday 18 March 2005 02:21, Mark Moriarty wrote:
> If I start VLC with a --sout-transcode-fps either greater than (say 
> or less than (say, 20.0) the actual 25 fps being used to generate the PTS,
> the transcode is truly messed up.  I can see VLC moving very rapidly 
> the source file, definitely too fast to be doing video transcoding.  The
> output file size is small, also shows no video.  Finally, ProjectX also
> reports no video found.

In MPEG 2 video, only a few fps values are allowed (defined in the spec). 
Using anything else you will likely have ffmpeg bail out so end-up with no 
transcoded video.

> There's absolutely nothing wrong if VLC chooses to implement 25 fps as the
> default --sout-transcode-fps.

The default for --sout-transcode-fps is 0 which means don't change the 
original fps.


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