Re: [rtcweb] Performance of H.264...
John Leslie <john@jlc.net> Wed, 20 November 2013 19:26 UTC
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Date: Wed, 20 Nov 2013 14:25:50 -0500
From: John Leslie <john@jlc.net>
To: Maik Merten <maikmerten@googlemail.com>
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Cc: rtcweb@ietf.org
Subject: Re: [rtcweb] Performance of H.264...
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Maik Merten <maikmerten@googlemail.com> wrote: > Am 20.11.2013 18:52, schrieb Bernard Aboba: > >> http://iphome.hhi.de/marpe/download/Performance_HEVC_VP9_X264_PCS_2013_preprint.pdf > > There's much to be said about PSNR as means for comparing image quality. > There's also much to be said about PSNR as means for conducting > cross-codec quality assessments. > > And little of it is pretty. I don't think we need to pick on the authors here -- they were quite clear about what they were doing. IMHO, the point to take away from the paper is that _neither_ H.264 nor VP8 are considered "current" first choices. The paper basically showed _by_how_much_ H.264 falls short of current state-of-the-art. > I always chuckle when I see x264 being given the "--tune psnr" > parameter. Even core developers of x264 have strong opinions on this: > http://x264dev.multimedia.cx/archives/458 Fun reading... But we _don't_ need any more lengthy criticisms of comparisons right now. We _aren't_ going to drop everything and switch to H.265 as MTI -- or any other state-of-the-art codec. I fully agree that both H.264 and VP8 deserve SHOULD status; and I agree H.261, being good enough for sign-language reading, looks like the right fallback. H.261 is certainly easy enough to "implement" and deploy; and I'll bet 80% of us are ready for the question... -- John Leslie <john@jlc.net>
- [rtcweb] Performance of rate-controlled H.264 Con… Bo Burman
- Re: [rtcweb] Performance of rate-controlled H.264… Basil Mohamed Gohar
- Re: [rtcweb] Performance of rate-controlled H.264… Bo Burman
- Re: [rtcweb] Performance of rate-controlled H.264… Martin J. Dürst
- Re: [rtcweb] Performance of H.264... Bernard Aboba
- Re: [rtcweb] Performance of H.264... Maik Merten
- Re: [rtcweb] Performance of H.264... Bernard Aboba
- Re: [rtcweb] Performance of H.264... John Leslie
- Re: [rtcweb] Performance of H.264... Stephan Wenger
- Re: [rtcweb] Performance of H.264... Monty Montgomery
- Re: [rtcweb] Performance of H.264... Thomas Reisinger
- Re: [rtcweb] Performance of H.264... Basil Mohamed Gohar
- Re: [rtcweb] Performance of H.264... Stephan Wenger
- Re: [rtcweb] Performance of H.264... Harald Alvestrand