[MPlayer-users] Reducing FPS?

Hans-Carl Oberdalhoff hco at gmx.de
Sat Mar 19 11:36:28 CET 2005

> > >> Hi,
> > >>
> > >> you can use the option -ofps of mencoder.
> > >> Use mencoder -ofps 25.
> > >
> > >No...
> > >This sets the output frame rate.
> > >If i do this, i get video which is 1/2 the speed of normal.
> >
> > It seems that I do not fully understand your problem.
> > I use to reduce the FPS of my videos with ofps because some of my files
> > are at 60fps.
> I basically need mencoder to drop every 2nd frame.
> Thanks.

If you tell mencoderthe "-ofps" option, it tries to achieve this framerate 
without changing speed of the video. 
It will drop/duplicate frames as needed.

But sadly, sometimes it gets this a bit wrong. (For example speed-changes 
sometimes happened, when I de-telecined videos)
You can try "mencoder -fps 50 -ofps 25" to remind him of the input framerate 
then.  This helps in my cases.

This of course only works, if you do re-encode the video. Using "-ovc copy" 
will not allow any drops/duplicates of frames.

Hope this helps,

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