Thanks. For reference, yes libvmaf does limit the psnr. 60dB for 8-bit
video, 72dB for 10-bit. Google tells me that indeed, 60dB is the limit of
visual perception, give or take.
The computation is the same:
double eps = 1e-10;
*score = MIN(10 * log10(peak * peak / MAX(noise_, eps)),
Carl Eugen Hoyos (12019-06-26):
> The source code contains the following line in vf_psnr.c:
> return 10.0 * log10(pow_2(max) / (mse / nb_frames))
> so a likely range is 0-100
You are reading the formula upside down: x/max would have a range [0;1]
(possibly later converted to a percentage), but
Am Di., 25. Juni 2019 um 22:00 Uhr schrieb Le Chiffre
:
>
> I have found that the psnr result from the psnr filter, vs the psnr that is
> part of libvmaf (calling it via ffmpeg), differs slightly, generally under
> 1%. I suppose the implementation is different.
>
> This seems ok. What is more
I have found that the psnr result from the psnr filter, vs the psnr that is
part of libvmaf (calling it via ffmpeg), differs slightly, generally under
1%. I suppose the implementation is different.
This seems ok. What is more interesting is that libvmaf-psnr clearly has a
range up to 60 whereas
