[x264-devel] PSNR Calculation

[A. Mullius]

So there is no possibility to calculate the psnr based on an upscaled frame
to the 1920x1080 of the original frame? In this case i could decide the best
point to change the resolution.

Thx!

On Fri, Aug 12, 2011 at 11:30 AM, James Darnley <james.darnley at gmail.com>wrote:

> On 12/08/2011, A. Mullius <mullius87 at gmail.com> wrote:
> > Oh, that's not good for my issue. I encode a video at different
> bitrates(100
> > kbit - 10Mbit) and resolution(320p to 1080p). Therefore I use the psnr as
> > metric to decide at which bitrate i go up to the next higher resolution.
> How
> > do you decide when it is better to use a higher resolution or a lower one
> at
> > a given bitrate?
>
> When the quality of a certain resolution drops below a given point,
> reduce the resolution.  The psnr is one way to get this information.
> I don't see how the fact that the encoder only knows about what it is
> given affects this.
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