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Camera frame rate effect on audio

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Jim McNally
Camera frame rate effect on audio
on Jul 28, 2010 at 1:44:18 am

For years my camera recording 29.97 frames of video happily captures the audio in perfect sync. Now with DSLRs, more shoots are being done at 23.98.

When using a digital recorder such as a Zoom H4N is there a setting to indicate what frame rate is being recorded on the camera side? I know I want it at a 48K sample setting but do I need to worry about the camera frame rate?

thanks,

Jim McNally
The Commercial Factory
http://www.commercialfactory.com


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Sam Mallery
Re: Camera frame rate effect on audio
on Jul 28, 2010 at 2:29:56 pm

There is no frame rate setting in the Zoom H4n. Most consumer portable recorders don't have frame rate settings. I researched what settings people were using with success with the H4n, and I found equal praise for 48kHz 24-bit and 48kHz 16-bit.

Personally, I always set my recorder for 48kHz 24-bit and so far everything has been going smoothly.

http://www.sam-mallery.com


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Jim McNally
Re: Camera frame rate effect on audio
on Jul 28, 2010 at 2:38:34 pm

Great, thanks for your response Sam.

Jim McNally
The Commercial Factory
http://www.commercialfactory.com


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Ty Ford
Re: Camera frame rate effect on audio
on Jul 29, 2010 at 1:22:10 pm

Jim, Sam,

I did have a near space anomaly recently that I can't explain fully.

I ran a Canon XL2 for an hour and also recorded audio to a Sound Devices 744T. The 744T was set to 30 fps NDF

In the current version of FCP, the 744T track was out of sync with itself. That is, when I visually aligned the waveforms of the XL2 and 744T, the audio from the 744T was not in sync with itself.

That is to say that when I soloed the 744T and watched and listened as those tracks played, the sound I was hearing was not synced to its own waveform.

I used wave agent to change the frame rate to 29.97 and the sync problem went away.

I don't know if this was due to a idiosyncratic glitch or not. I have not had time to experiment further.

Time code is only stamped at the header in file-based audio. There is no longitudinal time code, so, over time, there is no continuous sync.

The 744T does have a setting for no time code I wasn't aware of. So it can record w/o time code.

I know this may muddy the water a bit, but I thought I should put it out there.

Regards,

Ty Ford

Want better production audio?: Ty Ford's Audio Bootcamp Field Guide






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