So there are a lot of AVI files who have 2 audio files embedded. I want to remove the 6 channels and only keep 2 channels because i want it to play on my XBOX360. On windows this task is very easy as there are specific apps for this. Does Linux Ubuntu have these apps? If not, what can I do to make sure this happens and I get the result I want.
Even when this question seems to be related to audio, you are referring to an AVI, which is indeed a video file.
However, transcodification can be done by several applications which features GUI and command line.
I prefer -of course- those which feature a GUI, of which I can mention: Mobile Media Converter (only for 32 bit systems), Transmaggedon, SoundConverter and many more.
SoundConverter (SoundKonverter also in KDE) will allow you to extract the audio from a video source.
When transcoding, you can choose several parameters like: Audio and Video format, Audio and Video bitrate and a few more options (at least in the advanced options of Mobile Media Converter)