This has nothing to do with '3GPP'. Your question is about SDP - an
IETF standard (which 3GPP - and many other organizations - have
adopted).
Example,
Regular:
a=rtpmap:97 MP4A-LATM/22050/2
Alternate:
a=rtpmap:97 AMR/8000
Is the above alternate possible for any clip??
No, this is not legal SDP. The dynamic RTP payload format code (97
in this case) can be defined by only one "a=rtpmap:" line.
What is legal, however, is to use two separate dynamic RTP payload
format codes within the same stream, and use one for MPEG-4 LATM
audio, and the other for AMR audio - e.g.,
m=audio 0 RTP/AVP 96 97
...
a=rtpmap:96 MP4A-LATM/22050/2
a=rtpmap:97 AMR/8000
However, our software currently does not support this (at either the
server or the client end).
(Note that this mailing list is for discussion of the "LIVE555
Streaming Media" software, not for general discussion of SDP etc.)
--
Ross Finlayson
Live Networks, Inc.
http://www.live555.com/
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