title: Detecting whether someone is speaking in a video
body: <p>I'm trying to figure out how to detect whether a human that I've identified in a video is speaking. I'm using some of the multi-person multi-camera tracking code posted <a href="http://cvlab.epfl.ch/research/body/surv" rel="nofollow">here</a> to detect individuals and I want to determine whether someone identified is speaking at any given time. Is anyone aware of good CV projects that might be able to do this? I've trawled around the action recognition literature a bit but haven't found anything that seems to directly address this. Detection of speaking needs to be done only with video. </p>