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Re: [rtcweb] Transcoding

'Ron' <ron@debian.org> Mon, 13 January 2014 13:19 UTC

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Date: Mon, 13 Jan 2014 23:48:36 +1030
From: 'Ron' <ron@debian.org>
To: rtcweb@ietf.org
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Subject: Re: [rtcweb] Transcoding
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On Mon, Jan 13, 2014 at 01:46:52PM +0100, Karl Stahl wrote:
> > Why would transcoding a separate video stream introduce speech delays?
> 
> --- Real life: That is exactly why I said: 
> " Chrome with VP8 on old laptops with 1 core 1.5 Ghz x86 is not even usable.
> "
> 
> CPU load shows 60-100% usage, and you now and then see a good video, BUT
> AUDIO is more than 5s, FIVE SECONDS DELAY!
> 
> Turning off video, Opus audio is perfect (200 ms delay or so).
> 
> Transcoding these advanced Videocodecs is a very poor option... Simply too
> heavy!

It's not quite clear to me what you are actually arguing here, but you
realise that VP8+Opus in Chrome is ...   not transcoding?

Which would seem to leave the only valid part of your statement as just:

 "these advanced Videocodecs is a very poor option... Simply too heavy!"


Perhaps you would be interested in Hervé's benchmarks of H.261 then?

Unless you subscribe to the opinion some people have expressed that you
just don't deserve video on that device and would be better off without
any option for it at all?

  Ron

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