[MEncoder-users] Frame Rate and file Size

[bruno agostini]

Thanks a lot, your solution works perfectly for my problem. The file
remains the same size but then the player plays the movie at 5 fps with
the same quality.

 
On Sun, 2005-02-27 at 10:48 +1100, Peter Hartshorn wrote:
> On Sat, 26 Feb 2005 11:18 am, bruno agostini wrote:
> > I have a strange problem I quite don't understand here. I want to make a
> > divx with 2000 jpg. So I use the following command:
> >
> > mencoder  mf://*.jpg -mf w=512:h=256:fps=30:type=jpg -ofps 30 -nosound
> > -ovc lavc -lavcopts vcodec=msmpeg4v2:vbitrate=500 -o movie.avi
> >
> > Then I get a 5 MB movie of 67 sec and I am happy with that. But I also
> > want to make a version at 5 fps (it is a scientific movie so that I want
> > to have a slow version to see details without having to settle the speed
> > on the player everytime). So I use:
> 
> Why not just make a copy of the 30 fps movie (cp movie.avi movie_5fps.avi) and 
> then use avifix (from transcode?) to set the framerate to 5 in the avi header
> (avifix -i movie_5fps.avi -f 5)
> 
> >
> > mencoder  mf://*.jpg -mf w=512:h=256:fps=5:type=jpg -ofps 5 -nosound
> > -ovc lavc -lavcopts vcodec=msmpeg4v2:vbitrate=500 -o movie.avi
> >
> > I have the same number of frame (2000), the same effective bitrate (I
> > checked), only the fps (i.e. the movie is now 400 sec) has changed, but
> > I get a 25 MB movie! But there is the same amount of information to
> > encode in the second case isn't it? So why should the file size be
> > different?
> >
> > thanks for your help!
> >
> >
> >
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> > MEncoder-users at mplayerhq.hu
> > http://mplayerhq.hu/mailman/listinfo/mencoder-users
> 
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