The only thing I don't like about my old Canon S3 IS camera is that it records video without compression. Meaning that 4min 640x480/30fps vid is about 512MB...
I spend some time playing with MEncoder ("...a free command line video decoding, encoding and filtering tool released under the GNU General Public License" and a really *great* tool) and found a way to encode (or scale) my videos from Linux command line:
Encode from Canon RAW (acceptable quality):
$ mencoder INPUT.mpeg -oac copy -ovc lavc -lavcopts vcodec=mpeg4:vbitrate=1800:mbd=2:trell=yes:v4mv=yes -o output.avi
Scale video:
$ mencoder INPUT.mpeg -vf scale=320:240 -oac copy -ovc lavc -lavcopts vcodec=mpeg4 -o OUTPUT.mpeg
$ mencoder INPUT.mpeg -vf scale=320:240 -oac copy -ovc lavc -lavcopts vcodec=mpeg4 -o OUTPUT.mpeg
More info about MEncoder @ http://www.mplayerhq.hu/DOCS/HTML/en/mencoder.html
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