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Audio sync slipping on long blu-ray

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Terry Flaxton
Audio sync slipping on long blu-ray
on Jul 5, 2011 at 7:19:27 am

We're compiling a blu ray with 6 hours 10 minutes of HDV originated footage.

Output as pro-res, transcoded in Compressor, assembled on Encore, put on a 50 gig dual layer.

Though all the interview clips are discrete, from clips 11 through to 17 the audio slips at an inconstant rate (though it's hard to tell - it might be 2 or 4 frames, or even 6 occasionally). Staring so long at it we might even be talking ourselves into thinking it's slipping between sync and out of sync.

We've thought of a million reasons, read the list, searched google. Is the problem that there's too much data, the pathway we've chosen, the actual form we're using - or is there a fix?

A long term DP - likes 35mm and HD equally - changing with digital media - Began as a commercials editor !


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Daniel Ludwig
Re: Audio sync slipping on long blu-ray
on Jul 5, 2011 at 8:18:45 am

hi terry,
there should be no reason why your audio getting out of sync.

could you please give us a bit more details about the project.? is it a single film of 6h10, or are there seperated clips.

which video-and audio-codec did you use? MPEG2, H264, PCM or AC-3?

have you checked the original file if it is in sync?

cheers

danny


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Terry Flaxton
Re: Audio sync slipping on long blu-ray
on Jul 18, 2011 at 1:57:09 pm

Thanks for this and whilst I went offline.

I discovered the people supplying the streams were giving one extra frame of audio per interview which was the cause...

doh!

Best, Terry

A long term DP - likes 35mm and HD equally - changing with digital media - Began as a commercials editor !


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