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H4N sync drift

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Scott Faranda
H4N sync drift
on Nov 20, 2010 at 11:00:49 pm

Hey everyone,
Ran into a little issue with a play that I'm currently shooting.

I'll try and provide you with as much info as possible

Shot with two cameras (Canon HF20 and HV40) and a Zoom H4n Recorder (for crowd noise).

One camera's (HF20) audio was a direct line from the soundboard in the theater.
The other camera's (HV40) audio is just the camera's built-in microphone feed.

I was able to sync the two camera's audio perfectly just by dropping the HV40's audio track backwards 2 frames (because I was in the back of the theater, so there was a slight delay).
I made a marker when a door was shut on stage to match up all the audio (including the H4n), however the audio from the H4n starts to sync drift after a few minutes and by the end of the sequence it's completely off. Although no matter how much the H4n sync drifts, the two camera's audio stay perfectly in sync.

-Both camera's are shooting at 29.97fps
-Audio rate on the camera's is 48khz
-Audio rate is 44.1khz on the H4n Recordings (wich are mp3s)
-Sequence setting is at 29.97 and 48khz for audio rate.

Is there any way to fix what I already have? and if not I still have two performances that I can shoot, so what should I change so that it all goes according to plan for the next two?

Thanks in advance.

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