I have 6 hour long interviews that were shot with two Canon 5Ds and the master audio recorded on a Zoom. I'm using PluralEyes 3 to sync the audio. The audio settings on the camera were set to 16 bit 48.0 KHz and the Zoom settings were 24 bit 44.1 KHz. I transcoded the 5D footage to ProRes using Compressor.
I set up my sequence with the audio set to 16 bit 48.0 KHz. I put the Camera A on V1, A1 and A2, Camera B on v2, A3 and A4, and the Zoom audio on A5 and A6. I run that through PluralEyes and I appear to have interviews in sync. I then make a split screen daily for the producer so he can see both angles while me makes selects. What happens is that as you playback, the audio drifts out of sync.
My default sequence settings are set to 1080p 16 bit 48.0KHz. I've run into problems before with switching to 24 bit audio and sync issues and used this article as a tool to figure out what I need to do:
You would think it would be as easy as switching the audio settings on the sequence, but it isn't.
My first thought was to convert the WAV files from the Zoom to match the camera audio. I tried that and it didn't work. I then tried transcoding one of the video clips with the audio matching the Zoom settings and that didn't work either. I've done some research and it looks like the issue is with the Zoom audio being recorded at 44.1 KHz
Another thing I have noticed is the waveform doesn't match the picture on camera B. If look at the picture, the marker in each sequence is where you hear the clap. The visual on Camera A appears to match up but not on Camera B. However if you watch Camera B, it plays back in sync. Since PluralEyes uses the waveforms to do the sync, it throws things off a bit but that is easily fixed by visually matching the clappers.
The question is, is there a way to keep these interviews in sync all the way through to the end?