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pull down audio from TC 30 to TC 24

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Max Hoffmann
pull down audio from TC 30 to TC 24
on Aug 6, 2012 at 6:00:24 am

Hi,

I am editing a industrial that was shot with a frame rate of 29.97 and changes later to 23.97. As well the Audio was first recorded in 30 TC and the to 24. I am a bit in a hurry to fix this and kind of dumb on how to down convert or pull down the audio. The footage is no problem. It was not shot in synch sound. I am editing in FCP 7, 23.97 fps. Any ideas? Eternally grateful. Thanks Max

Max Hoffmann
everything_max@mac.com
http://www.everythingmax.com


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Bouke Vahl
Re: pull down audio from TC 30 to TC 24
on Aug 6, 2012 at 9:51:34 am

I don't get it.
There is no speed difference. In both 23.976 and 29.97 a second is a second. Just that the latter contains more frames per second.
Audio runs at 48000 'frames' (samples) a second, so it should match.

TC in wave files is not written as TC, but as samples.
(there is logic, like TC is upnumbering per frame, sound does that ass well)
So the NLE takes care of decoding the TC based on the fps set for the video.

Now two things that might bite you.
FCP is notorious bad with this stuff. It very often things you actually do want a speed change (like 24 to 23.976 or vice versa)
You need to set your setup right, then restart, then sometimes rename the files if FCP already sniffed on them.

If the TC on the sound recorder was set with the knowledge there will indeed be a speed change (ancient practice, as all cams can run at all speeds nowadays), you can use Wave Agent (free from sound devices) to alter it.

Bouke

http://www.videotoolshed.com/
smart tools for video pros


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Max Hoffmann
Re: pull down audio from TC 30 to TC 24
on Aug 6, 2012 at 6:27:33 pm

Thanks a mill Bouke

Max Hoffmann
everything_max@mac.com
http://www.everythingmax.com


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