playing movies is hard work for he machine in general. Especially some heavily compressing codecs like MP4 (divix etc.) need some time to decode the movie. So when you use a huge format (eg. a 1600*1200 pixel movie) then you shouldn't be surprised if your machine is 100% busy.
In Blitz you should Close a movie before you end the program.
It is using DirectShow, the movieplayer of DirectX. You should know it can only play a movie if the codec is installed on a certain machine.
So probably it's the best practice to check if a codec is supported, and if it isn't, offer a codec install to the user. You may find a freely distributable codec at www.free-codecs.com. It would then be somethin like:
m=openmovie("test.avi")
if m=0 then
execfile "codec_install_whatever.exe"
print "press a key to continue"
waitkey()
else
closemovie m
endif
or maybe something more smart.
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