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Re: [rtcweb] Cross-check of Google VP8 vs H.264 comparison

Harald Alvestrand <harald@alvestrand.no> Fri, 15 March 2013 12:00 UTC

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From: Harald Alvestrand <harald@alvestrand.no>
Date: Fri, 15 Mar 2013 11:19:11 +0100
To: Bo Burman <bo.burman@ericsson.com>, "rtcweb@ietf.org" <rtcweb@ietf.org>
Message-ID: <547ec7c4-976d-4076-900e-b67da5dae0d3@email.android.com>
Subject: Re: [rtcweb] Cross-check of Google VP8 vs H.264 comparison
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Bo, did you run tests on our clips or your own clips, and with the rest of the settings our way or your way? Clip selection seems to matter a lot - which is why we published ours.

Bo Burman <bo.burman@ericsson.com> wrote:

>
>Hi,
>
>As said on the microphone today, we have cross-checked Google's VP8 vs
>H.264 comparison. Google reported bit rate gains for VP8 of 19%.
>However, the H.264 was at an unfair advantage due to the fact that the
>--tune psnr flag was not used in x264. This should of course be used
>when doing psnr-measurements. For vp8, this flag is set to psnr by
>default. 
>
>When re-running the tests with --tune psnr for x264, and using version
>130 of x264 instead of version 128 that was used in the Google test,
>the difference disappeared (1% difference). 
>
>Cheers,
>Bo
>_______________________________________________
>rtcweb mailing list
>rtcweb@ietf.org
>https://www.ietf.org/mailman/listinfo/rtcweb

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