I have recorded a TV show with dual channels (left is dubbed, right is original voice) and then converted into a mp4 file. The movie plays fine in VLC where I can choose the audio channel I want to listen too.
On my Galaxy Tab the movie plays fine too (with several apps: the built in Video app, Rockplayer, Doubletwist and Vplayer), but I haven't found a Video app that lets me choose the audio channel; it's a little difficult to watch the movie with two difficult audio tracks in your left and right ear...
Are there other apps I could try? Or is there some utility that would let me redirect only the left or right channel to both ears?