[x264-devel] PSNR Calculation

[A. Mullius]

Does anybody can help me with this issue?
is there  no possibility to calculate the psnr based on an upscaled frame to
the 1920x1080 of the original frame?

Thx!

On Fri, Aug 12, 2011 at 12:22 PM, A. Mullius <mullius87 at gmail.com> wrote:

> 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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>>
>
>
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