[x264-devel] PSNR with x264

[Peter Hartmann]

> Hi,
>
> I encoded some videos using x264 and also tracked the PSNR for each
> frame using the --psnr parameter. Unfortunately I get this warning:
> x264 [warning]: --psnr used with psy on: results will be invalid!
>
> Does this mean that all my PSNR values are invalid? How can I desable
> this 'psy' ?
>
> Please help me.
>
> Best Regards 

Hello

"Psy" is short for psychovisual optimisations, which are meant to
enhance video quality by exploiting human mind's perception of said
image. For some it looks better, for some it doesn't. You can disable it
alltogether with --no-psy argument.

Regards,
Peter