A submission from 1994, 26 seconds:
Quite an achievement!
I had a Mac 660av (with a built in-in capture card and hardware en/decoding) and, naturally, played around with video and encoding. I wouldn’t have thought that this film fits onto a floppy. (Mind there is even less space on a Mac floppy than on the PC-formatted equivalent.)
Clever use of the cartoon oriented codecs (which are, as I recall it, the most efficient ones of those that came with QuickTime.)