There's no reason to deliver video in a 16:9 box if the aspect ratio of the content isn't 16:9, so nobody should be wasting macroblocks on black bars. Which isn

There's no reason to deliver video in a 16:9 box if the aspect ratio of the content isn't 16:9, so nobody should be wasting macroblocks on black bars. Which isn't to say that someone won't jam it down your throat.