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

Hi Jim:

I think the setup was a physical cable to jam-sync the 2 machines,
which was then disconnected, and then the wireless transmission was of
audio from the mixer to the camera.

Since the audio recorded on the camera looks in sync, I don't think
it's an issue with the wireless audio transmission.

video was XAVC 4K.

No Lockit box...

Thanks,
--Michael

On 2014-06-25, 4:03 PM, Jim Feeley jfeeley@gmail.com [Avid-L2] 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
>
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> 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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