First, import your video: dvgrab -rewind -f mpeg2/hdv -showstatus -a timestamp
Next, convert your hdv mpeg2 stream to a mov container so Final Cut Pro can import it: ffmpeg -i timestamp001.m2t -vcodec copy -acodec copy -f mov timestamp001.mov
FCP X is buggy, so we need to export the audio from our movie individually: ffmpeg -i timestamp001.m2t timestamp001.aiff