Re: [MMUSIC] draft-garcia-mmusic-sdp-misc-cap-00. About "icap"
"Ingemar Johansson S" <ingemar.s.johansson@ericsson.com> Tue, 18 November 2008 22:26 UTC
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From: Ingemar Johansson S <ingemar.s.johansson@ericsson.com>
To: mmusic@ietf.org
Subject: Re: [MMUSIC] draft-garcia-mmusic-sdp-misc-cap-00. About "icap"
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--- Begin Message ---Hi I believe that the icap attribute can be useful, also I don't see it as controversial as it is after all as Miguel points out only meant for human consumption. FYI icap was also inlcuded in the examples in a 3GPP SA4 submission and the reason was simply to make things easier to read (problems with email and internet connectivity makes it difficult for me to give the link to the submission right now..) Regards Ingemar Original message below ===================================== From: mmusic-bounces@ietf.org [mailto:mmusic-bounces@ietf.org] On Behalf Of Miguel A. Garcia Sent: den 18 november 2008 10:06 To: mmusic Cc: Joerg Ott Subject: [MMUSIC] draft-garcia-mmusic-sdp-misc-cap-00. About "icap" Yesterday we had a discussion about the Miscellaneous Capabilities draft, and there was a question about the "icap" capability. I was listening to the audio stream and posted some comments on the chat room, but let me try to clarify the issue. The "icap" capability allows to express media "i" lines as capabilities. Bear in mind that the "i" line is intended for human consumption, so, there are no semantics added to it, other than provide a human readable description of the media stream. If we wanted to get a user agent to consume the information, we should be using the "label" attribute specified in RFC 4574. So, considering that the i line is for human consumption, people would ask whether there is a need for expressing it as a capability. The authors discussed this issue and came up with a use case where a user would offer several alternative media streams and could indicate in the i/icap line some information about what is in that media stream. For example, one could indicate that a video stream contains a close-up of the presenter versus a general room, or an audio stream could contain the original movie audio track versus the director's commentary. This could help the answerer to select the appropriate alternative media stream. Obviously this require the endpoint to be able to present this information to the end user. Honestly, I don't know of any endpoint that allows the user to write an i line, or which displays it to the end user.=20 That might be the weakest selling point of this idea. But technically it makes sense. What do people think? What should we do in the next revision of the document, should we keep the icap line (and add the use case description), or should we remove it? Thanks, Miguel -- Miguel A. Garcia +34-91-339-3608 Ericsson Spain _______________________________________________ mmusic mailing list mmusic@ietf.org https://www.ietf.org/mailman/listinfo/mmusic--- End Message ---
_______________________________________________ mmusic mailing list mmusic@ietf.org https://www.ietf.org/mailman/listinfo/mmusic
- [MMUSIC] draft-garcia-mmusic-sdp-misc-cap-00. Abo… Miguel A. Garcia
- Re: [MMUSIC] draft-garcia-mmusic-sdp-misc-cap-00.… Krishna Prasad Kalluri
- Re: [MMUSIC] draft-garcia-mmusic-sdp-misc-cap-00.… Miguel A. Garcia
- Re: [MMUSIC] draft-garcia-mmusic-sdp-misc-cap-00.… Krishna Prasad Kalluri
- Re: [MMUSIC] draft-garcia-mmusic-sdp-misc-cap-00.… Ingemar Johansson S