Re: [rtcweb] Video codec selection - way forward
David Singer <singer@apple.com> Wed, 20 November 2013 19:42 UTC
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Subject: Re: [rtcweb] Video codec selection - way forward
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I think we should think hard about H.263 instead of H.261 as the third fallback. Why? http://www.itu.int/rec/T-REC-H.263/ H.263 was first published in March 1996, so it's 17 years old. The restrictions (e.g. on picture size) are no WORSE than H.261. Yes, more recent amendments deal with this (and a plethora of other issues), so we’d need to settle on which of those are mandatory (the usual profiling discussion). There are 34 records in the patent database against H.261, mostly from 1989 but one as recent as 2005 (though that is a re-file). That's 2.2 (reciprocity), as was one other I checked. Rather surprisingly, there are only 31 against H.263! The most recent is 2011, and is also option 2. Most are 1997-2001. On this quick glance, H.263 appears no worse than H.261. IANAL (as I am sure you have all noticed). H.263 is much more widely supported and mandated. It has been mandated in the 3GPP specs for years (for lots of services, including videoconf), and is effectively the fallback codec today in the industry, as I understand. It was ubiquitous in video telephony for years, and I suspect many of those systems still ship it. So, would “MUST implement at least two of (H.264, VP8, H.263)” work? (I am asking the question, not even answering on behalf of my company, yet. Let’s get the issues on the table.) David Singer Multimedia and Software Standards, Apple Inc.
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- Re: [rtcweb] Video codec selection - way forward cowwoc
- Re: [rtcweb] Video codec selection - way forward Gustavo Garcia
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- Re: [rtcweb] Video codec selection - way forward Gonzalo Camarillo
- Re: [rtcweb] Video codec selection - way forward Magnus Westerlund
- Re: [rtcweb] Video codec selection - way forward Magnus Westerlund
- Re: [rtcweb] Video codec selection - way forward Leon Geyser
- Re: [rtcweb] Video codec selection - way forward Gonzalo Camarillo
- Re: [rtcweb] Video codec selection - way forward Magnus Westerlund
- Re: [rtcweb] Video codec selection - way forward Magnus Westerlund
- Re: [rtcweb] Video codec selection - way forward Magnus Westerlund
- Re: [rtcweb] Video codec selection - way forward Jeremy Fuller
- Re: [rtcweb] Video codec selection - way forward Jonathan Rosenberg
- Re: [rtcweb] Video codec selection - way forward Gili
- Re: [rtcweb] Video codec selection - way forward David Singer
- Re: [rtcweb] Video codec selection - way forward Bjoern Hoehrmann
- Re: [rtcweb] Video codec selection - way forward Leon Geyser
- Re: [rtcweb] Video codec selection - way forward Harald Alvestrand
- Re: [rtcweb] Video codec selection - way forward cowwoc
- Re: [rtcweb] Video codec selection - way forward Magnus Westerlund
- Re: [rtcweb] Video codec selection - way forward cowwoc
- Re: [rtcweb] Video codec selection - way forward Eric Rescorla
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- Re: [rtcweb] Video codec selection - way forward cowwoc
- Re: [rtcweb] Video codec selection - way forward cowwoc
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- Re: [rtcweb] Video codec selection - way forward Basil Mohamed Gohar
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- Re: [rtcweb] Video codec selection - way forward Thomas Reisinger
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- Re: [rtcweb] Video codec selection - way forward cowwoc
- Re: [rtcweb] Video codec selection - way forward Thomas Reisinger
- Re: [rtcweb] Video codec selection - way forward Ross Finlayson
- Re: [rtcweb] Video codec selection - way forward Leon Geyser
- Re: [rtcweb] Video codec selection - way forward Maik Merten
- Re: [rtcweb] Video codec selection - way forward Thomas Reisinger
- Re: [rtcweb] Video codec selection - way forward Maik Merten
- Re: [rtcweb] Video codec selection - way forward Magnus Westerlund
- Re: [rtcweb] Video codec selection - way forward Magnus Westerlund
- Re: [rtcweb] Video codec selection - way forward Magnus Westerlund
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- Re: [rtcweb] Video codec selection - way forward cowwoc
- Re: [rtcweb] Video codec selection - way forward Maik Merten
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- Re: [rtcweb] Reference implementation of software… Maik Merten
- Re: [rtcweb] Video codec selection - way forward DRAGE, Keith (Keith)
- Re: [rtcweb] Video codec selection - way forward DRAGE, Keith (Keith)
- Re: [rtcweb] Video codec selection - way forward David Singer
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- Re: [rtcweb] Video codec selection - way forward Maik Merten
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- Re: [rtcweb] Video codec selection - way forward Bernard Aboba
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- Re: [rtcweb] Video codec selection - way forward Bernard Aboba
- Re: [rtcweb] Video codec selection - way forward Maik Merten
- Re: [rtcweb] Video codec selection - way forward David Singer
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- Re: [rtcweb] Video codec selection - way forward Maik Merten
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- Re: [rtcweb] Video codec selection - way forward David Singer
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- Re: [rtcweb] Video codec selection - way forward David Singer
- Re: [rtcweb] Video codec selection - way forward Cullen Jennings
- Re: [rtcweb] Video codec selection - way forward Maik Merten
- Re: [rtcweb] Video codec selection - way forward Maik Merten
- Re: [rtcweb] Video codec selection - way forward Leon Geyser
- Re: [rtcweb] Video codec selection - way forward Eric Rescorla
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- Re: [rtcweb] Video codec selection - way forward Monty Montgomery
- Re: [rtcweb] Video codec selection - way forward Matt Fredrickson
- Re: [rtcweb] Video codec selection - way forward Eric Rescorla
- Re: [rtcweb] Video codec selection - way forward Martin Thomson
- Re: [rtcweb] Video codec selection - way forward Enrico Marocco
- Re: [rtcweb] Video codec selection - way forward Cullen Jennings
- Re: [rtcweb] Video codec selection - way forward Matthew Kaufman
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- Re: [rtcweb] cisco binary on ec2 Cullen Jennings
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