This is a little howto (in fact it’s only a note for me 
) concerning conversion from one type into another using ffmpeg in the shell. You should have already installed ffmpeg 
ffmpeg -i original.mpg -f flv -b 400000 -ac 1 -r 23 -s 320x240 video.flv
- i: input file
- f: output format
- b: bit rate (video)
- ac: number of audio channels
- r: frame rate
- s: size (widthxheight)
Update: There’s a video tutorial about ffmpeg here
