ffmpeg

install ffmpeg on ubuntu

sudo apt-add-repository ppa:jon-severinsson/ffmpeg
sudo apt-get update
sudo apt-get install ffmpeg


how to use ffmpeg convertor  ?

Is identical on all distributions
example1:
ffmpeg -i InputVideo.mpg -vcodec mpeg4 -b 3000k -s hd480 -acodec flac OutputVideo.mkv
example2:

ffmpeg -i iranian classic.flv -vcodec -b 128k -s 4400 -acodec flac iranian classic.mp3

good luck