Me and my team produce music videos for a professional organization. We capture audio in our recording studio using separate microphones and then layer the video on top of the recorded audio in Final Cut. Recently, we've encountered a problem with our camera where the captured audio and video playback on the camera itself (as well as transferred files in Final Cut) is roughly 4.5% slower than in reality. Does anyone know if there's a fix in the camera's settings somewhere? Or is it a hardware issue?
Not all micro SD are created equally. Some are faster than others. Check the firmware for sure..
Are you using FC (or some other app) to synch the various audio sources? Seems, even with the delay, you would be able to synch the sources, independently and still be okay. Then, synch with the video.
Camera audio is often sub-par unless using external mics with the camera as well. If using external sources, you might consider not using the camera audio.