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Re: [MMUSIC] IETF#89: BUNDLE: Q9: What are the criteria for allowing usage of the same PT value within multiple m- lines?

Christer Holmberg <christer.holmberg@ericsson.com> Mon, 03 March 2014 11:06 UTC

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From: Christer Holmberg <christer.holmberg@ericsson.com>
To: Colin Perkins <csp@csperkins.org>
Thread-Topic: [MMUSIC] IETF#89: BUNDLE: Q9: What are the criteria for allowing usage of the same PT value within multiple m- lines?
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Date: Mon, 03 Mar 2014 11:05:55 +0000
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References: <7594FB04B1934943A5C02806D1A2204B1D1C368D@ESESSMB209.ericsson.se> <7A9A37FB-196F-4F79-805B-95CE9B67C344@csperkins.org> <7594FB04B1934943A5C02806D1A2204B1D1C5A25@ESESSMB209.ericsson.se> <97FFA3D1-8159-43B8-BD02-02BF420D4464@csperkins.org> <7594FB04B1934943A5C02806D1A2204B1D1C5BBF@ESESSMB209.ericsson.se> <D1A5B4EB-45E0-4BFA-BB93-96119F1B8152@csperkins.org> <7594FB04B1934943A5C02806D1A2204B1D1C5CCE@ESESSMB209.ericsson.se> <FF73D8EC-D4EB-4E53-8D05-63D4624F4B01@csperkins.org> <7594FB04B1934943A5C02806D1A2204B1D1C5DDF@ESESSMB209.ericsson.se> <331AFD56-7C29-4BB3-9B63-00D1E9317F9C@csperkins.org>
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Subject: Re: [MMUSIC] IETF#89: BUNDLE: Q9: What are the criteria for allowing usage of the same PT value within multiple m- lines?
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Hi,
>The same way you separate every other stream: SSRC to identify the media source, then direct to >the right decoder path based on the PT mapping table.

Yes, but then you need to know which SSRC(s) are going to be used for each media stream.

Huh? You may have to explain, because I don't see that.

Assume you have two video m- lines.
On both m- lines, you indicate that you can receive a codec using PT value Y.
Then, you receive a video media packet, with PT value Y, and SSRC value 1234567. How do you know which of the two m- lines this media packet is associated with?
Regards,
Christer





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Colin Perkins
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