avconv

Install

sudo apt-get install ffmpeg

Audio

MP3 to OGG

Note: I am really not sure how good this method is (I didn’t even listen to the file):

Check the file format:

ffmpeg -i beethoven-2-1-1-pfaul.mp3

Convert the file:

ffmpeg -i beethoven-2-1-1-pfaul.mp3 -acodec vorbis -ab 192k beethoven-2-1-1-pfaul.ogg

WAV to MP3

avconv -i talk-2014-02-02.wav talk-2014-02-02.mp3

Video

Just download Transmageddon from the software centre!!

Issues

See Firefox issues ref playing OGG files, Issues.