Setting a video's audio track in a playlist?

[JustAnotherDave]

I have a set of mp4 videos that have multiple English audio tracks (director's commentary, etc.). I want to watch these videos with their default audio track sometimes but other times I want to watch them all with the director's commentary track instead. Each new item that opens from a playlist goes back to the player's default audio track setting.

Can I make a playlist that sets up any or all of its videos to use an audio track other than the player's default?

[Jean-Baptiste Kempf]

Maybe xspf vlc extensions.