24fps video on retail Blu-ray question.

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pittrek's avatar
RE: 24fps video on retail Blu-ray question.

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

DirectShowSource(".....")

AssumeFPS(23.976, true) ?

Or did I missunderstand the question ?

ChainsawAsh's avatar
RE: 24fps video on retail Blu-ray question.

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?

ChainsawAsh's avatar
RE: 24fps video on retail Blu-ray question.

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.

Doctor M's avatar
RE: 24fps video on retail Blu-ray question.

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.

Last edited on February 19, 2011 at 5:04 PM by Doctor M
Dr. M

I think he said, 'death rabbits.'
ChainsawAsh's avatar
RE: 24fps video on retail Blu-ray question.

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.

DVD-BOY's avatar
RE: 24fps video on retail Blu-ray question.

It's tricky because blu-ray supports both 24fps and 23.976fps.  Most titles are 23.976 I think because there are some TV sets which don't like 'pure' 24fps.

I personally would go with Chainsaw Ash's view of making the video fit the audio rather than the other way around.

Last edited on February 20, 2011 at 5:29 PM by DVD-BOY


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