The mp4 video files I am working with are created on an Android device, there is always a slight pause in video at the end of the file, the audio goes on for a spit second longer.

I think this is because the video stream is being concatenated to the nearest keyframe during the encoding of the mp4, however I dont have an control over this, I must work with these MP4's.

Can I use ffmpeg to re-encode the mp4 making the sound and video end exactly together (removing the excess audio)?

Here are a couple of examples of the mp4's I am working with, the pause at end of each file varies in length (presumably because the keyframes in the video stream can be up to a second apart)

http://www.sendspace.com/file/8281gm