I haven’t worked it out but I would imagine playing a 44.1Khz audio file in 48K video project would generate a much more significant difference than 1 second per hour. This is complete guesswork on my part but it could be that your edit software is perhaps converting your 44.1K file to 48K – either on the fly or when it is imported and so it could feasibly be this conversion that is slightly awry over the long duration. As I say, this is complete speculation on my part but WAV tests at both 44.1 & 48 may reveal something.
Just a thought. But in any case, certainly don’t record in mp3 format when you need a/v sync.
C
