Re: [rtcweb] resolutions in draft-cbran-rtcweb-codec-01
"Bran, Cary" <cary.bran.standards@gmail.com> Tue, 29 November 2011 17:57 UTC
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Date: Tue, 29 Nov 2011 09:57:29 -0800
From: "Bran, Cary" <cary.bran.standards@gmail.com>
To: Ralph Giles <giles@thaumas.net>, Aron Rosenberg <arosenberg@logitech.com>
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Thread-Topic: [rtcweb] resolutions in draft-cbran-rtcweb-codec-01
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Cc: "rtcweb@ietf.org" <rtcweb@ietf.org>
Subject: Re: [rtcweb] resolutions in draft-cbran-rtcweb-codec-01
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Hi Ralph, On 11/17/11 5:30 PM, "Ralph Giles" <giles@thaumas.net> wrote: >On 17 November 2011 17:10, Aron Rosenberg <arosenberg@logitech.com> wrote: > >> I would suggest dropping 720x480 as it is neither 16:9 or 4:3 ratio, >>but a >> non-standard 3:2 ratio. > >720x480 is a standard SD broadcast/DVD-Video resolution. With >non-square pixels and overscan, it can represent either 4:3 or 16:9. >Both proposed baseline codecs in this draft support non-square pixels, >since a lot of video is in this format. > >I don't know how useful it is to have this as a SHOULD, but I would >ask why the corresponding PAL resolution (576 lines) isn't also >included if this one is considered useful. I have added this to the 02 version as a SHOULD. > >> From a camera perspective 1024x768 and 800x60[0] are >> not well supported in video modes. > >That's true, but these are common VGA screen resolutions. I think it's >useful to have them for presentations and screencasting. 1024x768 has >been a standard format for conference presentations for more than a >decade, and 800x600 is a useful fallback. > >As to how this SHOULD should be read, I think the point here is that >while some devices have fixed formats due to hardware constraints, >others (like a desktop browser) are quite flexible, so it's helpful to >have a list of common resolutions implementers can choose to offer in >the absence of other constraints, and to test against. Stole a bit of this verbiage and integrated it into the 02 version. > > -r >_______________________________________________ >rtcweb mailing list >rtcweb@ietf.org >https://www.ietf.org/mailman/listinfo/rtcweb
- [rtcweb] resolutions in draft-cbran-rtcweb-codec-… Roni Even
- Re: [rtcweb] Video resolution SHOULDs (Re: resolu… Roni Even
- Re: [rtcweb] resolutions in draft-cbran-rtcweb-co… Cary Bran (Standards Mailer)
- [rtcweb] Video resolution SHOULDs (Re: resolution… Harald Alvestrand
- Re: [rtcweb] Video resolution SHOULDs (Re: resolu… Stephan Wenger
- Re: [rtcweb] Video resolution SHOULDs (Re: resolu… Harald Alvestrand
- Re: [rtcweb] Video resolution SHOULDs (Re: resolu… Roni Even
- Re: [rtcweb] Video resolution SHOULDs (Re: resolu… James M. Polk
- Re: [rtcweb] resolutions in draft-cbran-rtcweb-co… Aron Rosenberg
- Re: [rtcweb] resolutions in draft-cbran-rtcweb-co… Ralph Giles
- Re: [rtcweb] resolutions in draft-cbran-rtcweb-co… James M. Polk
- Re: [rtcweb] Video resolution SHOULDs (Re: resolu… Ralph Giles
- Re: [rtcweb] Video resolution SHOULDs (Re: resolu… Harald Alvestrand
- Re: [rtcweb] Video resolution SHOULDs (Re: resolu… Harald Alvestrand
- Re: [rtcweb] resolutions in draft-cbran-rtcweb-co… Bran, Cary
- Re: [rtcweb] resolutions in draft-cbran-rtcweb-co… Bran, Cary
- Re: [rtcweb] resolutions in draft-cbran-rtcweb-co… Ralph Giles
- Re: [rtcweb] Video resolution SHOULDs (Re: resolu… Bran, Cary
- Re: [rtcweb] Video resolution SHOULDs (Re: resolu… Ralph Giles
- Re: [rtcweb] Video resolution SHOULDs (Re: resolu… James M. Polk
- [rtcweb] Interlace (Re: Video resolution SHOULDs … Harald Alvestrand
- Re: [rtcweb] Interlace (Re: Video resolution SHOU… Stephen Botzko
- Re: [rtcweb] Interlace (Re: Video resolution SHOU… Ralph Giles
- Re: [rtcweb] Video resolution SHOULDs (Re: resolu… Ralph Giles
- Re: [rtcweb] Video resolution SHOULDs (Re: resolu… Stephen Botzko