Not really an expert at this, i also have a problem with crashes, and i found people have problems with the videos.
I can offer this advice, sometimes if you got some programs which clean your registry, it can sometimes make your videos stop working altogether, i found the solution to this, simply go into your Movies folder in your FF7 folder, and double click ff7movkeyC.reg and allow the registry values to be put back in.
No idea if this will work for you, just a suggestion