[FFmpeg-user] Is it possible to just change the fps flags?

[Bernd Butscheidt]

----- Original Message -----
> From: Carl Eugen Hoyos <cehoyos at ag.or.at>
> 
>>  I want it to leave the frames exactly the way they are 
>>  now but only play 24 of them every second so that the
>>  video runs slower.  I.E. instead of being 10:27 long 
>>  the video is 13:02.
> 
> The setpts filter supports this, it needs reencoding though.

There was an effort to supply a patched version of ffmpeg doing this trick without reencoding (if the video format used supports this at all ...)
http://forum.doom9.org/showthread.php?t=152419

But what I see it is not maintained anymore. Still, there is a windows binary you can try.