Re: [MPlayer-users] Reducing FPS?

[D Richard Felker III <dalias@xxxxxxxxxx>]

On Sat, Mar 19, 2005 at 06:25:49PM +0100, Hans-Carl Oberdalhoff wrote:
> > > mencoder -o test.avi -nosound -noskip -fps 50 -ofps 25 -oac copy -ovc
> > > lavc -lavcopts
> > > odec=mpeg4:trell:v4mv:vhq:vqmin=2:vqmax=20:vmax_b_frames=2:aspect=4/3:vbi
> > >trate=1800 -vf crop=704:568,scale=704:396,denoise3d -sws 2 movie.mpg
> >
> > Ok, looks like the problem had something to do with frameno.avi for audio.
> >
> > After removing frameno, mencoder is now encoding at the correct rate... but
> > the video is now very jerky.
> 
> Hello,
> 
> try using "-oac copy" instead of "-nosound". "-nosound" sometimes breaks sync 
> and such stuff.

Correct.

> If your video gets jerky, maybe not exactly every second frame is dropped. 
> You 
> can try to play around with the "decimate" filter. (never tried it yet, dunno 
> if it is usefull *shrug*)

I don't think they're duplicates...but it's hard to tell since he has
given us no information to go on.

> btw, are you sure that your video is completely progressive?

50fps video is always (inherently) progressive.

> btw, the "noskip" option should not be needed for mencoder.

It will actually mess things up.

Rich

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