Re: [MMUSIC] RID, MID and BUNDLE: Associate received RTP packet with m- line

As long as the recipient has seen both the MID for an SSRC and the RID 
for an SSRC, then it can perform the proper correlation.

If they haven't seen the MID yet, then they can't use the stream because 
they don't know what m-section it goes with.

/a

On 10/22/15 08:53, Christer Holmberg wrote:
>
> Hi,
>
> Section 7 of the RID draft says:
>
> “Note that 'rid's are only required to be unique within a media
>
>    section ("m-line"); they do not necessarily need to be unique within
>
>    an entire RTP session.  In traditional usage, each media section is
>
>    sent on its own unique 5-tuple, which provides an unambiguous scope.
>
>    Similarly, when using BUNDLE
>
>    [I-D.ietf-mmusic-sdp-bundle-negotiation], *MID values associate RTP*
>
> *   streams uniquely to a single media description.*”
>
> However, when BUNDLE is used, the MID value (RTP MID header extension) 
> is not guaranteed to be present in every RTP packet. Section 14.1. of 
> BUNDLE says:
>
> “The RTP MID header extension SHOULD be included in some RTP packets
>
>    at the start of the session and whenever the SSRC changes.  It might
>
>    also be useful to include the header extension in RTP packets that
>
>    comprise random access points in the media (e.g., with video
>
>    I-frames).”
>
> So, if the MID value is NOT included, and RTP packets associated with 
> multiple m- lines use the same RIP value and the same PT value, will 
> it be possible to associate the RTP packets to a single media description?
>
> Regards,
>
> Christer
>
>
>
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