"Error in parsing VOL information: null" problem

Question

Hi. I have a problem where I'm using a the IBM codec and JMF to render a live mp4v-es/rtp stream from an axis IP camera. The DataSource is showing that i have the data streaming and i create and realize the player but when I go and start the player, it tells me "Error in parsing VOL information: null" and stops the player. There is no information whatsoever on this error anywhere and I don't know what I'm doing wrong. It seems to happen when BasicController.TimedStartThread.start() is called. What is the VOL information????? I am only streaming video so maybe it's expecting audio as well??? I really dont know. Help!!!!!!
Also, is the IBM MPEG4 codec the only one that decodes mp4v-es/rtp streams?? The FOBS one does its for mp4v/rtp, mp4v-es/90000 but not this exact one.

Answer 1

VOL in this case means "video object layer". It's the part of an mpeg4 bitstream that carries basic information on the stream. Without having read that no decoder will be able to configure itself. VOL headers are transmitted frequently, but not on a "per frame basis", there may be a couple of seconds between them. If you have any way of increasing timeouts, waiting a little longer might help.
The IBM codec may be the only one to decode those streams in JMF, I don't know. It's certainly not the only one in the real world.
nils