Mplayer Dvd Audio

I've been burning DVDs like I have for the past couple years. Until recently I've not had any issues playing them back, but the latest discs have had trouble playing.
The audio track seems to be defaulted to commentary, which is at best annoying.

I found how to change the audio channel by playing with mplayer using the following:

$ mplayer dvd://1 -alang en

Cheers.