Or, since the files are in OGM containers, use:
http://oggmux.sourceforge.net/
If you want to select default audio stream with BSplayer you can use the options provided by the Playlist right panel
Load the movie files into the playlist and then select the movies with default english audio tracks. Now in the right panel change the Audio stream from 1 to 2.. Now you can save the playlist in internal format and the options will be kept!
It should work.. I say should because with OGM containers sometimes BSplayer have problems when setting a default audio track different from "1" :roll: