Java: Analyze audio from video

I am in the process of writing a file management application for film projects. It will parse the video and look for the sound of the clapperboard. Once found, it will provide the user a frame from the video so they can enter the information in some nearby forms. The formats I need to use are mp4 and MTS.

My problem is, I don't understand where to start. As far as mp4 goes, I have tried a combination of JAAD and musicg to split the audio off the video, save it as a .wav, and analyze it with musicg. While this works, it seems rather inefficient and it only works with mp4.

How are mp4 and MTS files saved, and how can I read them in java? Once I get the audio split apart, how do I find the clapperboard?

Thanks in advance.