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Hi, I am looking for more feedback on the following topic (not
by Roni or Ali). The example in the draft is coming from a distribution
source using for example SAP (multicast distribution). There are three entities in the communication. The multicast
distribution source, the unicast retransmission which also serves as a feedback
target and a client that wants to receive the multicast stream and will ask for
unicast resynchronization or retransmission. This SDP is coming from the distribution source and
according to the authors specify the multicast address, the unicast transport
address for the RTCP receiver reports for the multicast (SSM), the uincast
transport address on the feedback target/retransmission server that will be
used by the clients to ask for retransmission streams using RTCP-FB and the
transport address on the client that will be used by the feedback target to
send the unicast RTP stream to. Does this SDP look like it supplies all this information
enabling interoperable applications. v=0 o=ali 1122334455
1122334466 IN IP4 rams.example.com s=Rapid
Acquisition Examples t=0 0 a=group:FID 1 2 a=group:FID 3 4
a=rtcp-unicast:rsi m=video 40000
RTP/AVPF 96 i=Primary
Multicast Stream #1 c=IN IP4
224.1.1.1/255 a=source-filter:
incl IN IP4 224.1.1.1 192.0.2.2 a=recvonly a=rtpmap:96
MP2T/90000 a=rtcp:40001 IN
IP4 192.0.2.1 a=rtcp-fb:96 nack a=mid:1 m=video 40002
RTP/AVPF 97 i=Unicast
Retransmission Stream #1 (Ret. Support Only) c=IN IP4
192.0.2.1 a=recvonly a=rtpmap:97
rtx/90000 a=rtcp:40003 a=fmtp:97 apt=96 a=fmtp:97
rtx-time=3000 a=mid:2 Thanks Roni Even |