Because I monitor mame WIP thread I saw some news about Quantel Paintbox emulation in MAME (0) and then I randomly followed some links to other Quantel systems

Like HAL (basically like hardware compositor)

http://dexterslab2013.blogspot.com/2018/03/quantel-hal-video-compositing-system.html?m=1

99 layers of SD images or video, up to 15 min storage on 20 disk array!

https://m.youtube.com/watch?v=4k15hpeGzBA

if you have half of hour you can watch this demo from 1997. Biggest thing so far for me? We are free to use old-fashioned optical effects in front of real camera too :)

(0) - https://forums.bannister.org/ubbthreads.php?ubb=showflat&Number=120292&page=10