I found an MPEG1 video (only) file...i.e., not muxed with the audio...and 
Squeak seems to play it just fine.  So the problem seems to be limited to 
this slightly more exotic format.  Now I just need to figure out how to 
convert my existing files to this old format.

John

__________________  earlier note below __________________ 

Every technique I have tried for playing an MPEG movie file on the Mac OS 
(specifically an MPEG1 Muxed movie file) fails on load (it just goes into 
an endless spinning hourglass).  This is true on both 3.9 and 3.10 and 
have not tested it on earlier versions.

Anyone have any thoughts on this?  For what it's worth, the file tests as 
a valid MPEG file when I do MPEGFile isFileValidMPEG:

Thanks,
John
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