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Newbie Confusion re Davinci/Blackmagic and Audio Sync

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Peter Humble
Newbie Confusion re Davinci/Blackmagic and Audio Sync
on Nov 2, 2013 at 4:10:22 pm

Hi,
I've recently used the Blackmagic Cinema Camera for the first time with dual audio Capture and recording in Raw format.
I've just downloaded the Lite Version with the purpose of transcoding Blackmagic DNG files to Prores for Final Cut 7 editing.
I've set the project frame rates to match before importing the media as I read elsewhere.
The problem is that I'm having no luck being able to sync the files.
The really confusing thing is that the camera audio is way longer than the exported ProRes file which just makes no sense to me at all.

Shouldn't the camera audio file be the same length as the converted video?

Even when I manually line up the files they get radically out of sync very quickly.

Any tips?

Peter


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Marc Wielage
Re: Newbie Confusion re Davinci/Blackmagic and Audio Sync
on Nov 3, 2013 at 4:31:20 am

Use a free utility to check the audio file and see what the embedded timecode rate is. Sound Devices' Wave Agent is a good choice:

http://www.sounddevices.com/products/waveagent/

I would also check to see the Configuration setup on what rate at which you're playing back the files, and check the individual clips to see what the timecode of the DNG files are at.

A radical speed change sounds like a 44.1/48kHz sound issue, or possibly a 23.98/29.97 timecode issue.


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