The WP Color Video packet and the packet format. Incremented every time a new frame is sent.
Frames are often large enough to be broken into multiple packets.
The size of the compressed frame being sent. 24h - codecFlags Contains flags. The only one I know about is the keyframe flag, to indicate if the frame is a keyframe. If you receive a packet and this field does NOT match what you know from the client, drop the frame. 28h - codecChange Seems to be length of packet after frame sequence number and frame size, including length of compressed video.