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Author Topic: Video camera and recording rig. How to get the audio/video sync'd  (Read 1686 times)

Paul M.Sanders

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Hi all,

In my pub I'll be tracking live bands via the ADAT outs on my Yamaha O1V.

I'd also like to record video. Ultimately I'd like to burn DVD's for folks, but I'd like to have the audio track from my recording rig on the DVD instead of the crappy track most video cameras supply.

Where can I get started on how to pull this all together?

Thanks,

Paul
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Leftys BBQ and Old 33 Pub...
A place for music in Buford, GA
http://www.old33pub.com
http://www.leftys-bbq.com

Mark "Bass Pig" Weiss

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Re: Video camera and recording rig. How to get the audio/video sync'd
« Reply #1 on: June 20, 2007, 01:24:14 AM »

I have been recording symphony orchestras for years with this dual system situation, so I'll try to answer your question:

Synching audio to video depends on a couple of factors:

A recognizeable impulse sound (such as a hand clap) near the beginning of the recording,

Knowing the distance between the sound recording mic and the thing being recorded,

Stable clocks for both camera and audio recorder,

To a lesser extent, an audio recorder set to 48KHz sample rate, if you wish to minimize re-rendering audio for the DVD.


SOmetimes you get lucky and can visually see distinct impulse events in Premiere Pro or Vegas' timeline, and using such, can get reasonably close for the 'rough in' edit. The next thing I do is set the mixer levels so I can hear camera and MotU 896 audio at similar levels. Then I listen for 'echo' between tracks and nudge the audio track until the echo is gone. Check the beginning and the end. If the end is still synched, you're fortunate and don't have to chop up the audio and resynch parts of it for clock drift.

Some caveates are that your camera may be far away and using a long zoom, so the camera audio will be delayed and may not synch visually with where the viewer 'thinks' he is standing (based on a long zoom lens). In this situation, you may choose to advance the timing of the audio track to better match the movement on screen, rather than synching it to camera audio arbitrarily.

I know what you mean about crappy camera audio. I'm having a big debate on this and most video guys don't realize that a Sony HVR-V1U with a RightMark spec of 1222Hz to 16,0000Hz is not good audio. I've even had a Grammy winner argue with my test results. The Sony HDW-F900 on the other hand, has beautiful audio that I would not hesitate to use for music recording, if not for the need for more than two channels.
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