[Mark Augustine]

I used a cheap Tascam DR40. No adustment for clock rates.
But I figured out how to do what I needed.

I calculated the drift, which was consistent and did the math. The speed difference was .011 – so I loaded the clip into Audacity and applied the “change speed” effect, entered .011 and exported the file. Sync was just perfect.

I wonder what that .011 difference is, it’s not the same as compensating for 29.97 – but all that matters is that it works.

[Mark Augustine]

Good thought, surprised I didn’t check.

But both are 48KHz

Video frame rate was 29.97. I figure that’s gotta be the difference – FCP thinks it’s keeping the audio in sync by aligning 48,000 samples for every frame of video – which will understandably go out of sync because in reality there’s 48,000 samples for every actual second, not 30 full frames of video, which takes a bit longer to play than a second.

I think I’m answering my own question but the math is making my head hurt.

There’s gotta be a standard way to treat audio files for situations like this.