Originally Posted by
GrumpyDiver
Have you looked at using a decent external recorder and separately synching the audio and video? Use a slate with a clapper to give you the visual and sound synch.
The main reason I shoot with a dedicated video camera (Panasonic AF100) is its ability to take an external phantom power shotgun mike (Panny as well) on one channel and I will often supplement that with a secondary cardiod mike that I use an Audio Technica wireless transmitter on that is placed close to the sound source). It plugs into the second phantom power port on the camera; so I generally get decent sound from one of the two sources that is synched to the video in-camera. I have played with video recording on both the D90 and the D800, but frankly the sound is terrible.
I've tried to clean up bad sound using Adobe Audition (part of CC) but frankly, garbage in garbage out...