Fri Jan 31, 2014 10:09 am
I never used FCPx so i cannot talk about this with much practical insight, but historically editing programs had problems with mixed audio sample rates. Did you record both with the same sample / bit rate? If not, match the sample & bit rates before importing to see if that helps (or try a different editing program like premiere, if the problem persists there).
Also it would be interesting to see how much they go out of sync as this might be an indicator if the problem is related to a 23.97 vs 24 fps problem or a sample rate problem - or something completely different.
you could select a 10min piece of both sources and check out the different in run length for that. When i have time i will try to do tests with my BMPCC vs. Fostex FR2-LE since this would be a serious problem.
cheers,
t.