[Live-devel] H.264 NAL confusion

[Ross Finlayson]

>After tonight, I'm convinced something is wrong with my SDP stuff. 
>I fired up Wireshark to see the traffic between my transmitting 
>application and VLC, and I don't see the SDP stuff anywhere in the 
>bitstream.  Would it be contained in the RTP packets, or the RTCP 
>packets?

No, the SDP description is returned in the response to RTSP's 
"DESCRIBE" command.  (You can see this by running "openRTSP" on your 
server; you don't need to run 'wireshark' to see this.)


>The other thing I don't understand is I see other people using the 
>string "h264" for the sprop string in the framer

Why are people doing this?  This is completely bogus.  The 
"sprop_parameter_sets_str" parameter to 
"H264VideoRTPSink::createNew()" *must* be a string formed by 
Base-64-encoding the SPS and PPS NAL units, and concatenating them 
with ",".


>  I'm definitely confused about how RTSP, RTP and SDP all operate together

To use this software, you need to be familiar with these protocols.
-- 

Ross Finlayson
Live Networks, Inc.
http://www.live555.com/