Nice. Do you think you could do that for and MP4 that I recovered from accidental deletion that won't play? And do you think you could tell me if another of my MP4 vids is actually missing the audio track, or if it just isn't playing because of some glitch?
Sadly no, I'd have to do a lot of Googling. The thing about containers (.avi, .mp4, .mov, etc.) is that the video and audio can be compressed in many different ways and I don't know them off the top of my head (I don't specialize in this stuff). Your mp4 could have the audio at the beginning, and video at the end, or have something retarded like split in 512 byte segments and some is for audio and some is for the picture.
Generally information like this is kept in spec documents readily available online but they're usually long and incredibly boring to read.
If your camera is making corrupt recordings, I'd suggest sending some hate mail to support (I did to Contour lol).