Re: [rtcweb] Changing video size (Re: use case:)

[Stephan Wenger <[e-mail]>]

What Cullen writes below matches my experience.  And, its not even limited
to "modern" codecs.  I would suggest that the observed behavior is true
for any video codec that has sub-pel motion compensation, i.e. any video
compression standard developed since H.263 (1998).
Stephan

On 6.21.2011 09:11 , "Cullen Jennings" <[e-mail]> wrote:


>[...]
>
>Consider two different video flows using the same codec ...
>
>Stream A is 640 x 480 at 1mbps which is this scaled to 320x240 and
>displayed
>
>Stream B is 320 x 240 at 1mbps which is displayed at 320x240.
>
>My experience has been with modern video codecs that stream B will look
>better than stream A. As well as looking better, it will typically also
>have a better PSNR. There's a bunch of reasons why which are probably not
>worth going into here but give it a try and you will see what I mean. The
>key point is both streams where 1mbps. If stream B was sent at 256 kbps,
>then A would look better.
>
>
>
>
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