[meimeiriver]

Sometimes I have had this problem if the refresh rate is at 24.000 instead of 23.976. Make sure that your 24p is actually 23.976.

I noticed this today too. But not on all 23.976fps movies. Seems the audio (XBMC 13.2) is about 200ms ahead, thus rather noticable. I tried playing the same movie on my PC (instead of the same XBMC as installed on my media player). There are only 2 variables left: Ethernet vs. direct access, and monitor vs. TV. My media center can handle >50MBps easily, so it's not Ethernet. It's not fullscreen either.

I even tried encoding the audio to LPCM, thinking it would make things easier for XBMC. It didn't.

I don't have the 24p bug, btw.

EDIT: I forgot to mention the movie syncs just fine on my desktop XBMC.

I'm not an expert, but I think it is the TV's fault for not reporting the refresh rate correctly. That's not a fact but a strong suspicion. Some computer hardware may be better or worse at dealing with this. But I've tried three different configurations of hardware on the same TV and wound up with the same result.

Adding Reclock to DS Player or MPC-HC seems to work the best in all circumstances. But, even then, some content is still slightly out-of-sync. In the end, I went back to 60p playback after seeing 24p judder, artifacts and other tradeoffs that negate the small advantage of a native frame rate. I would prefer 24p playback. But even when it works, it still far from perfect in the home theatre environment.

Yeah. Except that I'm neither syncing my TV to my playback, nor vice versa. So my TV framerate shouldn't matter really, right?

Funny thing is, I have Blu-Rays that are like 40MBps, and stream 100% perfectly. Then I got x264 encoded material (from upscaled DVD's I made, for example) that are still low-ish on bitrate (like 10MBps or so) that are the ones that get out of sync sometimes. But, before ppl think, no, it's not the re-encoding I do, as a I reencoded a great many of my Blu-Rays (with x264, mostly for post-processing, like temporal denoising), and they all work flawlessly. Strange as it may sound (pun intended), it seems the lower the video bitrate, the more audio sync issues you can expect. Maybe it's a variable bitrate issue somehow (where the variances are huge).

But, like I said, this does not occur on my desktop PC: only the XBMC of my media center Zbox (over 1G wired Ethernet). So, maybe it's the TV (Sony BRAVA, Full-HD), after all.