I'm afraid I didn't come up with much. They seem to use their own video format called SMUSH. One SMUSH player I found only mentioned Rebel Assault, Full Throttle and The Dig, so I don't know if it'll work w/CMI.
http://scumm.mixnmojo.com/download.php
It doesn't support all of the opcodes, either.
Trailer:
http://www.milegend.com/downloads/downloads.php?id=4
(low-res, but what the heck... if anyone's interested)
SCUMM Revisited:
http://scummrev.mixnmojo.com/
Seems to rip everything but video...
At the bottom... How to run CMI in a window:
http://scummrev.mixnmojo.com/articles/inside.shtml
If you have a fast enough CPU&I/O, maybe you could run one of those window video capture programs, but then you'd still have to play through to find all the video.
The ScummVM project seems to contain SMUSH playing code, but I think it'd be a bit of work to get it to output AVIs.
http://scummvm.sourceforge.net/