- From: Christer Holmberg <christer.holmberg@ericsson.com>
- Date: Thu, 30 Aug 2012 09:50:35 +0200
- To: Dan Wing <dwing@cisco.com>, "public-webrtc@w3.org" <public-webrtc@w3.org>, "rtcweb@ietf.org" <rtcweb@ietf.org>
Hi Dan, Thanks for the information! The issue you raise is of course not related to BUNDLE, but to multiplexing in general. Regards, Christer ________________________________________ From: Dan Wing [dwing@cisco.com] Sent: Thursday, August 30, 2012 1:32 AM To: Christer Holmberg; public-webrtc@w3.org; rtcweb@ietf.org Subject: RE: [rtcweb] H.264 SVC and BUNDLE > -----Original Message----- > From: rtcweb-bounces@ietf.org [mailto:rtcweb-bounces@ietf.org] On > Behalf Of Christer Holmberg > Sent: Wednesday, August 29, 2012 11:50 AM > To: public-webrtc@w3.org; rtcweb@ietf.org > Subject: [rtcweb] H.264 SVC and BUNDLE > > Hi, > > At the telco yesterday one of the Microsoft guys claimed that H.264 SVC > does not work with BUNDLE, but he didn't have the details. > > Could someone please explain the reason why he/she doesn't think H.264 > SVC work with BUNDLE? > > (Note, that if using the same port for the different codec layers is a > problem, then it's not a BUNDLE problem - it's a generic multiplexing > problem.) The general multiplexing of layers onto the same 5-tuple is a problem, *if* we want the layers to have different DSCP values. This is because we cannot successfully and reliably set different DSCP values for packets belonging to a 5-tuple over the Internet -- too many things rewrite the DSCP field (to a different value) or simply clear the DSCP field. This makes it impossible to restore the per-packet DSCP values later (e.g., using RSVP, or using any other better/stronger/faster signaling method). If, however, each 5-tuple has its own DSCP value then that DSCP value could be restored. -d > Thanks! > > Regards, > > Christer > _______________________________________________ > rtcweb mailing list > rtcweb@ietf.org > https://www.ietf.org/mailman/listinfo/rtcweb
Received on Thursday, 30 August 2012 07:52:21 UTC