Need a bullet proof workflow to sync up with an external audio

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I shoot at 60p (59.94) but deploy to a timeline of (30p 29.97)

I own 2 tentacle units and am able to sync 2 video cameras with no issue BUT

I can never get my video to line up with an external audio source such as an h4n.

The audio of the external source is constantly drifting.

Please help me develop a workflow so that I don’t spend hours on this every project.  Tentacle was supposed to save me time but so far it hasn’t fulfilled it’s promise.


Thank you


Timecode is not a sync signal. It is a way to line up.

What that means is this; you put a timecode signal on the file but the camera’s and recorder will still run at it’s own clock.
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If you don’t put a Tentacle on the video and audio recorders you will get the same result; Align them at start, you will find drift at the end. Because they run at their own clock. The only thing the Tentacles do is to line them both up for you. At start, in the middle or at the end.

For short runs that is not a problem. For longer runs, it is. You have encountered that

There are a few options for you.

1. Make short stop-starts more often if you can. Each start will be re-synced.

2. Use better Audio (and/or Video recorders) that have better clocks, or even better; have WORD clock inputs and GENLOCK inputs.

That way they can run at an external clock. Then you need cables between them or you need a box like Ambient Lockits that have genlock out. But your camera’s and recorder don’t have such inputs.

3. You could also use Plural Eyes to sync instead and enable Drift Correction. I would never do that myself as i don’t want software that will time stretch my audio.
I hope i helped some.

edited answer
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