XAnim,
developed by, Mark Podlipec, supports a variety of
animations/movies (FLI, FLC, IFF, AVI, Quicktime, MPEG,
etc.). XAnim can even play an audio file (WAV format) with an
animation that doesn't already contain audio. It has a handy
remote-control window with buttons for volume-control and
frame-stepping control.
The latest version of xanim, 2.70.6.3, is available at:
ftp://xanim.va.pubnix.com/xanim27063.tar.gz
Also see the Moving Pictures coding Experts Group home-page.