Wrong video playback speed in analog System 573 DDR games.

[launcherEXE]

In analog DDR versions opening video plays at wrong speed, ending earlier than corresponding audio track. Compare these videos
https://www.youtube.com/watch?v=5AT2tGCgtQk
https://www.youtube.com/watch?v=bYjpWKABJoM
with these
https://www.youtube.com/watch?v=HQajCsSrD0o
https://www.youtube.com/watch?v=N02Ws9JECgY
https://www.youtube.com/watch?v=FScZ2_K_twc

[angelosa]

mame ddrj

Specifically MAME FMV ends about 2 seconds earlier than recorded PCB in 1st Mix Internet version, by judging at the "DDR" words being spoken just in time for the cut off. BGM comes from redbook audio, wording from the internal PSX SPU chip. Groovy.