JVT/AVC Coding 720X478 (853X478)
ACC 48000 Hz, Stereo (L R)
The full name for JVT/AVC is Joint Video Team/Advanced Video Coding. It's a variety of H.264.
I've noticed that videos converted using Handbrake show this format. Possibly because Handbrake uses "H.264 (x264)" rather than the standard H.264 when converting files. So it could be associated with the x264 codec.
See here for more about x264: