Am 14.10.2021 um 16:13 schrieb Michael Koch:
This is the command line for the lowpass filter, where the filter
freqency isn't a function of input size. The constant "8" is the
filter wavelength in pixels per linepair.
ffmpeg -i test.png -vf
scale=2*iw:2*ih,fftfilt=dc_Y=0:dc_U=0:dc_V=0:weight_Y='lte(hypot(X/pow(2,ceil(log(ceil(W*10/9))/log(2))),Y/pow(2,ceil(log(ceil(H*10/9))/log(2)))),1.0/8)':weight_U=1:weight_V=1,scale=iw/2:ih/2
-y lowpass.png
With two new variables for the FFT array size
ARRAY_H = pow(2,ceil(log(ceil(W*10/9))/log(2)))
ARRAY_V = pow(2,ceil(log(ceil(H*10/9))/log(2)))
Thanks for the patch. I will test it in a few days.
Michael
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