[Live-devel] Unicast and Multicast H264

[Ross Finlayson]

>I have one question about the difference of streaming Multicast and 
>Unicast. When I connect to a multicast server I receive in my 
>function "AfterReadingFrame" all the packets SPS, PPS and Slices and 
>then I parse all and save to decode when I need.
>I tried a Unicast server and then I need to work with 
>"fmtp_spropparametersets" to extract the SPS and PPS buffer to parse 
>because in my "AfterReadingFrame" I only receive Slice packets, no 
>SPS or PPS. If I save this packets with the Slice i can decode after 
>all.

You can't assume that this will always be the case.  I.e., you can't 
always assume that only multicast streams will have the SPS and PPS 
NAL units 'in band''.

Therefore your client should *always* extract this information from 
the SDP description, and feed it to the decoder in front of any 
network packet data.  It doesn't matter whether the stream is unicast 
or multicast.
-- 

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