Blu-ray Secondary Audio

I’ve just been scanning the new Blu-ray release from Sony, From Paris with Love. Like so many discs, it has an audio director’s commentary. What’s different is that this is implemented as BonusView secondary audio, rather than as a separate track. So it plays over the top of whichever audio track you have selected.

Doesn’t matter much on this disc, but I can image this being useful for those discs with several different languages since the, say, Italian viewer can hear the movie audio in Italian, even though the commentary itself may be locked in English.