Long ago we settled on a standard format for music files. It's not the only one, and it has many options and variants, but it is universally supported. When are we going to settle on such a format for video? AVI is the most popular and many major devices refuse to support it. Furthermore, if you want to buy music in MP3 format, (almost) everything is available and it hardly matters where in the world you are. If you want to buy movies and TV digitally, you pretty much have to live inside the United States.
Mokalus of Borg
PS - I realis AVI still comprises a variety of codecs.
PPS - Still, can't we settle on one?