Re: [MMUSIC] [rtcweb] Fwd: New Version Notification for draft-uberti-rtcweb-plan-00.txt
Christer Holmberg <christer.holmberg@ericsson.com> Tue, 07 May 2013 10:12 UTC
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From: Christer Holmberg <christer.holmberg@ericsson.com>
To: Harald Alvestrand <harald@alvestrand.no>, Justin Uberti <juberti@google.com>
Thread-Topic: [rtcweb] Fwd: New Version Notification for draft-uberti-rtcweb-plan-00.txt
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Date: Tue, 07 May 2013 10:11:55 +0000
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Cc: "rtcweb@ietf.org" <rtcweb@ietf.org>, "mmusic@ietf.org" <mmusic@ietf.org>
Subject: Re: [MMUSIC] [rtcweb] Fwd: New Version Notification for draft-uberti-rtcweb-plan-00.txt
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Hi, A few questions on the draft: Q1_CODEC/CODEC CONFIGURATION: The examples only show one PT per m- line, and the draft seem to assume that all PTs (ie codecs and/or codec configurations) apply to all SSRCs within an m- line. I think that is very important to point out, because at least in my opinion it is an important factor that we need to discuss. Example: I think Cullen often talks about using a camera with built in codec X. But, Plan B does not allow to (or, at least does not describe how to) explicitly offer codec X for the track/ssrc associated with the camera. Codec X is offered for ALL tracks/ssrcs associated with the m- line. Q2_1_LEGACY: The text says that things must work with legacy devices, and that an endpoint can choose a single source when communicating with a legacy device. But, there is really no text about how the legacy device will know which source to use, etc. Q2_2_LEGACY: The example in section 5.2 (and sub sections) confuses me a little. You indicate that the m- line itself represents "main", while ssrc attributes are used to describe the left/center/right mic sources. Why is there no ssrc attribute for the main flow? Q3_NUMBER_OF_M_LINES: The draft does not explicitly forbid the usage of multiple m- lines for a given media type (e.g. audio). It would probably be good to point that out also. Regards, Christer From: rtcweb-bounces@ietf.org<mailto:rtcweb-bounces@ietf.org> [mailto:rtcweb-bounces@ietf.org] On Behalf Of Harald Alvestrand Sent: 6. toukokuuta 2013 17:20 To: Justin Uberti Cc: rtcweb@ietf.org<mailto:rtcweb@ietf.org>; mmusic@ietf.org<mailto:mmusic@ietf.org> Subject: Re: [rtcweb] Fwd: New Version Notification for draft-uberti-rtcweb-plan-00.txt Note - I regard the Plan A / Plan B conflict as the "long end of the pole" with regards to resolving issues regarding SDP signalling in RTCWEB - and as such, I regard it as very important to get it resolved. The silence on this issue is disquieting. Harald On 05/03/2013 08:08 AM, Justin Uberti wrote: Scribbled down the basic concepts of what I have been referring to as "Plan B" - a way to signal multiple MediaStreamTracks in SDP without needing a separate m= line for each. Hopefully this will make discussion of this topic easier. ---------- Forwarded message ---------- From: <internet-drafts@ietf.org<mailto:internet-drafts@ietf.org>> Date: Thu, May 2, 2013 at 10:46 PM Subject: New Version Notification for draft-uberti-rtcweb-plan-00.txt To: Justin Uberti <justin@uberti.name<mailto:justin@uberti.name>> A new version of I-D, draft-uberti-rtcweb-plan-00.txt has been successfully submitted by Justin Uberti and posted to the IETF repository. Filename: draft-uberti-rtcweb-plan Revision: 00 Title: Plan B: a proposal for signaling multiple media sources in WebRTC. Creation date: 2013-05-03 Group: Individual Submission Number of pages: 15 URL: http://www.ietf.org/internet-drafts/draft-uberti-rtcweb-plan-00.txt Status: http://datatracker.ietf.org/doc/draft-uberti-rtcweb-plan Htmlized: http://tools.ietf.org/html/draft-uberti-rtcweb-plan-00 Abstract: This document explains how multiple media sources can be signaled in WebRTC using SDP, in a fashion that avoids many common problems and provides a simple control surface to the receiver. The IETF Secretariat _______________________________________________ rtcweb mailing list rtcweb@ietf.org<mailto:rtcweb@ietf.org> https://www.ietf.org/mailman/listinfo/rtcweb
- [MMUSIC] Fwd: New Version Notification for draft-… Justin Uberti
- Re: [MMUSIC] [rtcweb] Fwd: New Version Notificati… Harald Alvestrand
- Re: [MMUSIC] [rtcweb] Fwd: New Version Notificati… Christer Holmberg
- Re: [MMUSIC] [rtcweb] Fwd: New Version Notificati… Harald Alvestrand
- Re: [MMUSIC] [rtcweb] Fwd: New Version Notificati… Stefan Håkansson LK
- Re: [MMUSIC] [rtcweb] Fwd: New Version Notificati… Christer Holmberg
- Re: [MMUSIC] [rtcweb] Fwd: New Version Notificati… Roni Even
- Re: [MMUSIC] [rtcweb] Fwd: New Version Notificati… Harald Alvestrand
- Re: [MMUSIC] [rtcweb] Fwd: New Version Notificati… Harald Alvestrand
- Re: [MMUSIC] [rtcweb] Fwd: New Version Notificati… Christer Holmberg
- Re: [MMUSIC] [rtcweb] Fwd: New Version Notificati… Bernard Aboba
- Re: [MMUSIC] [rtcweb] Fwd: New Version Notificati… Bernard Aboba
- Re: [MMUSIC] [rtcweb] Fwd: New Version Notificati… Roni Even
- Re: [MMUSIC] [rtcweb] Fwd: New Version Notificati… Bernard Aboba
- [MMUSIC] Fwd: Re: [rtcweb] Fwd: New Version Notif… Stefan Håkansson LK
- Re: [MMUSIC] [rtcweb] Fwd: New Version Notificati… Harald Alvestrand
- Re: [MMUSIC] New Version Notification for draft-u… Cullen Jennings (fluffy)
- Re: [MMUSIC] New Version Notification for draft-u… Hutton, Andrew