Mpeg 4 video packetization scheme

[nehjain]

Hi
I am streaming a mpeg 4 video stream using TS as the mux (no RTP , just over plain UDP). I wanted to know the scheme VLC uses to map the mpeg 4 stream into the TS stream . Does it map one Sync Layer packet to one PES packet . Or does it use the Flex Mux layer also in between ? Also could anyone provide me the header/packet format of the Sync Layer packet so that i can decode the AU units within it in the proper manner .

Thanks