Strange drift Sony FX6 Zoom F4

3.78K viewsHardwaresyncproblem Timecode drift

I used a Sony FX6 and a Zoom F4 recorder. Both had a Tentacle attached permanently. FPS was set to 29,97 on all devices. Sequence in premiere is also at 29,97.  Syncing TC in post gave serious trouble and I ended up syncing with audio instead of TC. Looking at my sequence I now see that whenever there is a new audio or video clip, audio is behind by 1 frame, but this difference becomes larger quite quickly and after ten minutes audio is like over 20 frames behind (with both clips running normally at 100% and no cuts). Does anybody have any idea, how a clip that starts out in sync (well, nearly) can be out of sync (according to TC) by the end of it?

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I found out, that there is a drift between the TC from the Tentacle an the recorded TC. The Tentacle is connected to the FX6 permanently and when I film the Timeslate App and use the TC-Effect from FCPX, there is a drift of 1 Frame. After 1 Hour, there is no additional Drift, the 1 Frame is consistent.

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