At the World of Commodore 93 in New York, commodore had an A4000 mpeg 1 player in a plexiglass case playing mpeg 1 video off the hard drive. The video being demo'd was a Bon Jovi video from the early 90's. I asked an exec if the hardware was on the motherboard or a plug in card, he didn't know anything about it really. He said it was just an experimental unit.
Later this experiment became the CD32 FMV unit.
Also there was a company called IVS playing streaming video off the hard drive. They had recorded a few minutes of Back to the Future and it was played back in HAM MODE off of a modifed A500 or A2000.
