[belongamick]

Using Win7 Pro 64-bit, XBMC 12.0, bitstreaming to AVR, TV supports 23.976, 24, 50, 60 Hz. XBMC set to match playback to display. HTPC using and ATI 5450.

I am also experiencing lipsync issues on 24p material, but so far only on movies with DTS sound track, AC3 seems to be OK (on testing so far). And some DTS movies are also OK. The audio delay on the DTS movies seems to vary throughout the movie. On movies with lipsync issue I need to delay audio by approx 0.150.

If I disable vertical sync lipsync issues go away - but then left with tearing.

Previous posts in this tread link to a video sync file in 23.976 - can someone pls repost a link.

Have found that if I turn off bitstreaming and enable A//V Sync (using Audio Clock) that I get no Lipsync issues, and no issues with video judder. Except when I jump forward/back I sometimes start to see the "Missed" counter start incrementing (run away counter issue) and then lipsync issues creep in - this is resolved by jumping forward/back once or twice to stop the missed counter incrementing.

I have done some more testing on this. I can actually bitstream audio to my amp, and as longs as I enable A/V Sync (using Audio Clock) no lipsync issues encountered. This is with vertical sync enabled and "adjust display to match video" enabled. I have tested with several movies at 23.976 with AC3 and DTS - and where the DTS movies would before go in and out out sync now they're are now OK with this setup.

I seem to get 1 or sometimes 2 "Missed" frames during the course of a film - but no Drops. I haven't noticed any judder in films and I tend to notice that.

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I found the reason of the missed counter runaway. While I do not really think it has anything to do with the audio delay, I baked a patch for it.

Here is a Windows installer: http://subvoice.hu/xbmc/XBMCSetup-201212...53b-dx.exe
Source code: https://github.com/a11599/xbmc/commits/my_build
If you want to build your own, here is the actual commit: https://github.com/a11599/xbmc/commit/77...d2243cfb20

If you are going to test it, please let me know your findings.

Thanks for that. Some quick testing with this version and it appears the runaway missed counter is fixed and the a/v sync issues which in my case coincided with when the counter was incrementing.

My previous post above may be of interest.

UPDATE: may have spoke to soon. Was watching a film tonight and after having paused it for about a minute when it resumed the a/v was out of sync, which was cured just by jumping back 30 seconds. So, the missed counter issue may be fixed in that release but maybe this is not related to the AV sync issue after all.