Streaming UDP audio/video

[Beginner1]

How many ports do I have to allocate to a UDP video/audio stream?
Regards
Naty

[Rémi Denis-Courmont]

2 ports per elementary stream, or 2 ports as a whole if using TS.

[Beginner1]

Thanks for the rapid reply.
Can you please refer to some documentation where I can read alittle on that?
Regards
Nati

[Rémi Denis-Courmont]

The RTP AVP profile is defined in RFC3550.

[Beginner1]

Thanks,
Following your advise I could see the answer to my question and more...
On the other hand I made some experiments myself to trace it.
I streamed (VLC ver. 0.8.2) video and audio from one PC to another in my private LAn and ran a sniffer (Wireshark, if you know, without any filtering) and tried to trace the packets.
The packets were all with just one source port and one target port(though the packets type were MPEG PES, MPEG-1, represinting VIDEO and AUDIO respectively)
Can you please explain where does the other port hide?
Regards
Naty

[Rémi Denis-Courmont]

VLC 0.8.2 is antiquated. I don't even remember how it works.