Rob wrote on Sun, Jun 10 2007 at 23:13 (-0700):
> For example:
> I have a mp4 file of QVGA resolution (320x240);
> how can I convert this to QCIF ?
Mencoder can do this (comes with mplayer, extra package mencoder from
livna or atrpm)
mencoder -ovc lavc -oac lavc -lavcopts vbitrate=...:abitrate=... -o movie.avi original.avi
Can (re)encode original.avi to movie.avi (here with the lavc driver).
vbitrate and abitrate specify the video and audio bitrate,
respectively.
I've never changed resolution, but the -vf filter with the dsize
option seems to be what you are looking for. See the mencoder(1) man
page (excerpt):
VIDEO FILTERS
Video filters allow you to modify the video stream and its properties. The syntax
is:
-vf <filter1[=parameter1:parameter2:...],filter2,...>
Setup a chain of video filters.
where the filter you are looking for are
scale[=w:h[...]]
or
dsize[=aspect|w:h:aspect-method:r]
Cheers,
Andreas.
--
http://www.lysium.de/blog
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