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Re: [avtext] framemarking: add frame size info

"Paul E. Jones" <paulej@packetizer.com> Fri, 26 August 2016 16:52 UTC

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From: "Paul E. Jones" <paulej@packetizer.com>
To: Miguel París Díaz <mparisdiaz@gmail.com>, avtext@ietf.org
Date: Fri, 26 Aug 2016 16:52:18 +0000
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Subject: Re: [avtext] framemarking: add frame size info
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Miguel,

You make the assumption that the media distributor will not see the SDP, 
I suppose.  While certainly a valid model, I'll admit that I had 
personally assumed any media forwarding function would see the SDP (or 
at least be told the PT values and any relevant flow information similar 
to what RFC 6236 provides) and would thus know which PT values 
correspond to what video resolutions if simulcast is employed.

Paul

------ Original Message ------
From: "Miguel París Díaz" <mparisdiaz@gmail.com>
To: avtext@ietf.org
Sent: 8/25/2016 10:12:48 AM
Subject: [avtext] framemarking: add frame size info

>Hello,
>it would be great having frame size (width and height) info in the 
>Frame Marking RTP header extension [1].
>
>Why?
>For example, in the case of using simulcast in an SFU, selecting the 
>stream by the size would ease the application development and improve 
>the experience of the users.
>Application developers don't usually have deep knowledge about media 
>like bitrate, etc., but they know which video size has to be rendered 
>in the GUI, which may depend on the client where the app is running: a 
>mobile, a PC with a 13"· screen, a PC with 27" screen, etc.
>
>In this way and taking a videoconference app as example, if a 
>participant select another participant to be rendered as main video, 
>the app could ask the SFU to select the video quality that better 
>matches to 800x600 size.
>
>What do you think about this idea?
>
>Thanks and best regards!!
>
>Refs
>[1] https://tools.ietf.org/html/draft-ietf-avtext-framemarking-02
>
>--
>Miguel París Díaz
>------------------------------------------------------------------------
>Computer/Software engineer.
>Researcher and architect in http://www.kurento.org
>http://twitter.com/mparisdiaz
>------------------------------------------------------------------------

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