This IS the Avid L2: Re: [Avid-L2] timecode offset double-system jam sync

Wednesday, June 25, 2014

Re: [Avid-L2] timecode offset double-system jam sync

Might be that the 633 has a monitoring delay. You're recording, so it's striping as it goes, but then you're sending that output to the camera. Maybe there's a delay between input/record and output which is like a confidence?

On Wed, Jun 25, 2014 at 7:03 PM, Jim Feeley jfeeley@gmail.com [Avid-L2] <Avid-L2@yahoogroups.com> wrote:

That's a whole lot of offset. I'll see 0-2 frames with F5 cameras (that I see with some regularity) and a F55 (only worked with a couple times). Don't really have problems with Sound Devices timecode.

So what wireless transmitter are you using? Standard Lectrosonics, Zaxcom, Sennheiser? Or maybe production stuck a miss-set timecode buddy system between the 633 and camera?

Oddball framerate?

What video recording format? XVAC, HR, proxies, other?

Same thing happen if you physically jam the camera from the 633, disconnect the cable, and let it run (ie- without relying on a wireless tx)?

Got a Lockit or Denecke box you can slap on the camera? No bigger than the wireless receiver, I'd think, and perhaps more reliable...

I'm not much help.

jim feeley
pov media
word image sound

On Jun 25, 2014, at 3:18 PM, Michael Brockington brocking@sfu.ca [Avid-L2] <Avid-L2@yahoogroups.com> wrote:

> I have a test that was shot for me, audio recorded on a sound
> devices 633, wirelessly transmitted to a F55. Timecode from the 633 was
> used to jam sync the F55. Timecode on the first audio clip starts at
> 12:08:50:00.
>
> Problem is when I line up the audio waveforms, the timecode on the
> 633 audio is 15 frames ahead of the camera timecode. This was a test,
> so there was no great amount of time elapsed between jam-syncing and
> recording. The total time of the test is about 8 minutes, with the
> camera and audio recorder starting and stopping twice. Sync appears
> solid over the 8 minutes, and the 15-frame gap in timecode is consistent
> from head to tail.
>
> Any guesses as to what might be going wrong, here? Doesn't look
> like an obvious timecode rate mismatch between the 2, for instance.
>
> Thanks,
> --Michael

jim feeley
pov media
word image sound

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