Play AVI files as cut-scene... in BGE - HOW?

[jmdeschamps at gmail.com]

Blender Game Engine does not seem able to just play an AVI clip
file...

I want to play these files as cut-scenes in a game - subprocess it to
the OS, and continue on return seems a good solution - but so sorry,
it's been a while since I've delved in such places... I need a
refresher.

Must be platform independent (or platform *adjustable* ;-) )
Continue script execution only after it's over (in due time or passed
over by user)
Must be configurable to adjust ourput screen and stuff like that...

Any hints out there :-)

Thanks in advance!