Someone pointing a cheap ass camera at a monitor and recording them, those ones? Probably using the Damage X bespoke format software player intended for OCS + 030 25mhz or something.
You could write something more efficient using uncompressed lores 320x??? HAM6 frames as your source to cut down CPU decode time. Well within the chipset bandwidth. I couldn't crack the method of interleaving the sample data just yet so it got shelved. A600/1200 IDE bandwidth may limit your FPS though.
Interestingly there is also a function in Blitz Basic 2.1 to play ANIM files from HDD, not tried it though.