I've been trying to solve this for ages, trying every fix I found all over the internet, but still no results. In the opening cutscene (and probably the rest as well but I did't get that far), the video is slower than the audio, causing it to get more out of sync every second. I've tried switching on and off most of the compatibility settings (probably not all) but nothing affects the video speed.

My graphics card is an ATI Radeon HD 3800. I should probably mention that I have cutscene issues in most games (random examples: Psychonauts and SW: KotOR 2). Except those 'solve' the problem by letting the audio stop for a moment every few seconds, which is irritating as well but at least keeps it more or less in sync.

Maybe the only solution is to get a new video card, but I'd be very grateful if anyone has an idea how to fix this.

Please check this thread

http://www.gog.com/en/forum/beyond_good_and_evil/cutscenes_out_of_sync

For possible fixes to your problem.

I already tried all of those. Nothing works, it keeps being out of sync by the exact same amount...

Thanks for the link though, probably should have posted there but I'd checked so many different threads I forgot it existed.