Audio out of sync

[Octopuss]

Quite a nut to break here.
I just reinstalled my system (XP) and my movies are slightly out of sync with the audio. At least I believe so. Maybe the video is out of sync with the audio, but whatever - it's pretty much the same. It only happens with mp4 files, or more like, stuff I made into x264. Rest is fine.
This might not be the best place to ask, but I don't know about any other, so hopefully someone will give me a hint or two...
What I use is 2.27 BSP and latest (4th may) build of FFDShow.

[Tizio]

And the filters used by bsplayer are? (with the movie playing -> right click -> Options -> Filters -> Advanced)
I don't think your PC is too low on specs to run flawlessly your movie streams, but it's hard also to think of all your movies to be out of sync in first place.
There's a feature in BSplayer that can help you, by pressing SHIFT+CONTROL+Left/Right you can correct audio delays, but if your movies are not bad-synced, I think you should find the culprit and eliminate it

[Octopuss]

Yup, they are being used.
Even more weird, other movies are ok. But this one... I don't get it at all!!
Pre-reinstall it was ok.
I'll try re-encoding, but... jeez.

Btw. In options there are several possibilities to choose from in the audio output device - does it matter what I pick?

[J7N]

Originally Posted by Octopuss

I'll try re-encoding, but... jeez.

This is definitely not needed. If the movies are out of sync, you should determine the delay value. Then use MkvToolNix to remux the files with corrected delay. I don't know if you can do that with mp4box.

[Octopuss]

Well I am more interested in what the heck is wrong... I mean the player is same, codecs as well and the movie too!

[J7N]

Well, the first step would be to determine whether the movie is bad, or the codec setup. Try playing your MP4 on another computer, or at the very least VideoLAN Client.