It looked to me like all through out the video, there was a sync issue between the frames and the sound. The sound seemed to be working fine. But, every once in a while the frames seemed to speed up to "catch up" to the sound. In other words, maybe the camera captured at 30 frames per second, but the video published in 24 frames per second. Then about every 5 seconds, it's be 30 frames behind and speed up. At least, that's what it looked like to me.