pix240 + F3 + 788T timecode sync

Yes. There is a delay from the F3 to the PIX so external audio on the same master clock will be ahead by 2 frames. I am working on a project with the same workflow and the guide audio was being radioed back to the PIX. It was discovered after the shoot was over that there is an option to delay the audio to compensate but this doesn't alter the sep sound files from the 788t.

So the answer is to feed the audio through the camera which keeps both the ProRes and XDCam files with sync guide. Hopefully you do not need the XDCam files so if audio needs to be resynced from the 788t, the 2 frame offset needs to be done. In my case I can manipulate the EDL by 2 frames from the cut to do the reconform in Fairlight.

My preferred workflow is to use one camera as time of day timecode master not the 788t unless you have a master video clock from the camera. Otherwise the timecode feed to the cameras will not be correctly frame synced. A much better setup is to jam the 788t from the master camera. I will check my 788t and see if it is possible to jam with a 2 frame offset which would fix the sync issue as well. By momentary jamming the 788t twice a day you can untether as well. On a three week shot we had complete sync lock and no drift that way (apart from the 2 frame offset). I hope at least one shot in the whole production had a clapper so you can do a sync test. Should be part of every camera test.

Thanks Michael for your input. Glad to hear i'm not crazy.

If I understand correctly, you're not using Wave files created by the 788t, you're using the audio recorded on the Pix from the 788t. I need the wave files and the ProRes to be in sync.
We're on shooting day 5 of 31, so the sooner we can fix this, the better.


Paul: Both cameras sync together correctly, it's the Prores files that do not match the Wav files.
I'm being told by the sound guy that the 788t has a maximum delay of 30ms (in 23.98fps).

Thanks guys
Olivier

Thank you Paul
that's exactly what I was looking for.

Have you been able to successfully process files created by the pix? I get an error message telling me the app needs to quit (with Apple ProRes 422 1080@23.98).

XDcam quicktimes seem to work fine though.

Olivier

No, I mean Multiclip Offsetter is crashing on files created by the Pix240.

Interesting.

Will try it out.

Thank you Paul.

Olivier

The 788T currently has no TC offset feature.
Its something to consider I guess, but its a shame that camera manufacturers cant fix their own problems!

If we did something like this, wouldn't it make more sense to put a -ve TC offset in the PIX since that's where the delay manifests itself???

Paul

Technical Development Manager
Sound Devices, LLC

Paul, I finally was able to sync everything up with Multiclip Offsetter.

I like to have the wav file created by the 788t as a multiclip angle. But I can't create a multiclip with Aux TC since the wav files doesn't have an Aux TC track.
I used videotoolshed's FCP auxTC reader to add the bwf to a quicktime container with an aux TC track. It's a painful and expensive option but that's what happens when you work with consumer cameras.

Thanks for your help and if Sound Device comes up with an option to delay the timecode input to the Pix, We'd be happy to test it out.

Olivier