24fps video on retail Blu-ray question.

OK I have a retail Blu and the video is encoded at 24fps and obviously the audio to that Blu is in sync, well the English audio is only 2.0, I have the English DTS-HD MA English 5.1 track I want to sync up to this video but it goes out right away, I get them in sync right from the start and literally within minutes is already drifting out, by the end of the file it is way out, so my question is, do they encode the audio at 24fps to? and if so how do I get the video and audio back to 23.976fps? I hope this is making sense because I am stumped on this one, at first I was thinking one is cut and one is not, but both versions are exactly the same length, except for the studio canal intro on the Blu-ray with the DD 2.0, but that is easy enough to add to the new file, so if anyone has any suggestions I am all ears.

Thanks

Well since you're good at Avisynth, have you tried

DirectShowSource(".....")

AssumeFPS(23.976, true) ?

Or did I missunderstand the question ?

Actually, I probably didn't phrase my question real well, the video is really not so much the problem, I just cannot figure out why the audio goes way out so fast, how is the audio made to run at that speed? and can it be brought back to run at 23.976? LOL I probably still am not making sense, the issue is the audio, I need to sync the DTS-HD MA 5.1 to the crappy DD 2.0 on the Blu-ray, I just can't understand the difference whe both files are exactly the same length, time wise.

The DTS-HD isn't from a 25fps source, no?  How badly does it drift out of sync when married with the 24fps video?

Even better, what are the running times of both the 24fps video and the DTS-HD audio?

I have not checked the time on the video, I sync audio to audio, and both are 94 mins, except the DD 2.0 is like 10 or so secs longer because of the studio canal intro, but I line up the audio after that point, I will edit in the intro when I get back to it. I can take the intro off the DTS-HD MA Italian 5.1, the Blu-rays are Italian and UK, the Italian has the better video with only DTS-HD MA 5.1 Italian(this is the version with the DD 2.0 English so I can sync it) and the UK with the crappy video has the nice DTS-HD MA 5.1 English, if both video's are at 24fps the audio can't be in PAL, at least I wouldn't think, but either way both are Region B Blu's so the audio should line right up after the intro, this one really confuses me LOL, this should be a simple ass project.

Ah, yeah, it's probably not a PAL/NTSC issue then (though those terms have no meaning in high def, I'm using them to refer to 23.976fps vs. 25fps).

Try changing the video's framerate to 23.976 and see if it syncs then.  Most people won't notice a difference between 23.976 and 24, anyway.

I can change the video easy enough, but what of the audio?

Doctor M said:

You could probably try decoding the audio with BeLight (BeSweet) just like you would do slowing PAL audio to NTSC speeds.  Then just re-encode to Dolby with your method of choice.

"C:\..\BeSweet.exe" -core( -input "c:\work folder\Audio - AC3 - 2ch - 48kHz - DRC - DELAY 0ms.AC3" -output "c:\work folder\Audio - AC3 - 2ch - 48kHz - DRC - DELAY 0ms.wav"  -2ch -azid( -c none ) -ota( -r 24000 23976 )

There'll be a tiny shift in pitch, but I doubt any one would could hear it.

Thanks DrM, I will give it a shot.

My suggestion was that the audio wouldn't need to be changed, but the video would need to be ever so slightly slowed down from 24fps to 23.976fps, and that might (might) solve the issue.

If that doesn't work, than Doctor M's method will be the way to go.