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Re: [rtcweb] resolutions in draft-cbran-rtcweb-codec-01

"James M. Polk" <jmpolk@cisco.com> Fri, 18 November 2011 05:48 UTC

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Date: Thu, 17 Nov 2011 23:48:30 -0600
To: Aron Rosenberg <arosenberg@logitech.com>, rtcweb@ietf.org
From: "James M. Polk" <jmpolk@cisco.com>
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Subject: Re: [rtcweb] resolutions in draft-cbran-rtcweb-codec-01
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At 07:10 PM 11/17/2011, Aron Rosenberg wrote:
>On Wed, Nov 16, 2011 at 7:19 PM, Roni Even 
><<mailto:ron.even.tlv@gmail.com>ron.even.tlv@gmail.com> wrote:
>
>Hi,
>
>The text in the draft on video codec is
>
>
>
>o  MUST support a minimum resolution of 320X240
>
>
>
>o  SHOULD support resolutions of 1280x720, 720x480, 1024x768,
>
>       800x600, 640x480, 640 x 360 , 320x240

why is 320x240 listed as a MUST and as a SHOULD?

James


>I would suggest dropping 720x480 as it is neither 16:9 or 4:3 ratio, 
>but a non-standard 3:2 ratio. From a camera perspective 1024x768 and 
>800x60 are not well supported in video modes. Cameras, both 
>integrated and external generally support 640x480 and below with 
>high quality, or support 1280x720 and below with high quality. I 
>would also replace the intermediate 4:3 (1024x768 and 800x600) 
>resolutions with 16:9 sizes such as 1024x576 and 864x480.
>
>Aron Rosenberg
>LifeSize, A Division of Logitech Inc.
>_______________________________________________
>rtcweb mailing list
>rtcweb@ietf.org
>https://www.ietf.org/mailman/listinfo/rtcweb

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