Can I change a video resolution (say, from 640x480 to 320x240)?
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avconv if ffmpeg was not available) can do this easily too
ffmpeg -i input.mpeg -s 320x240 output.mpeg
There are felt one million additional options to change the output format. These can also be combined
ffmpeg -i input.mp4 -s 320x240 output.mpeg
*In Ubuntu 14.04 LTS ffmpeg is not available from the repositories.