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Audio sync slipping on long blu-ray
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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2 Replies
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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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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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