On Thu, Oct 14, 2021 at 12:29 PM Michael Koch <astroelectro...@t-online.de> wrote:
> Am 14.10.2021 um 12:07 schrieb Paul B Mahol: > > Sorry but I'm not on windows, so I can not use your script. > > Then try the below (slightly improved) version. It would become much > simpler with variables: > ARRAY_H = pow(2,ceil(log(ceil(W*10/9))/log(2))) > ARRAY_V = pow(2,ceil(log(ceil(H*10/9))/log(2))) > > The test image contains wavelengths from 4 to 8 (in the center) to 16 > pixels per linepair. > The filter wavelength is independant of input size. You can change the > size in the first command (but it must be 1:1 aspect ratio, otherwise > hstack would fail) > Since when hstack fails because of different aspect ratio? > > Michael > > > ffmpeg -f lavfi -i color=black:s=230x230 -lavfi > geq='r=127.5+127.5*cos((X-W/2)*PI/(pow(2,(1+2*Y/H))))',colorchannelmixer=1:0:0:0:1:0:0:0:1:0:0:0,split[h][v];[v]transpose[v];[v][h]hstack > > -frames 1 -y test.png > > 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 > > ffmpeg -i test.png -vf > scale=2*iw:2*ih,fftfilt=dc_Y=128:dc_U=1:dc_V=1:weight_Y='gte(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 highpass.png > > ffmpeg -i test.png -vf > scale=2*iw:2*ih,fftfilt=dc_Y=128:dc_U=1:dc_V=1:weight_Y='between(hypot(X/pow(2,ceil(log(ceil(W*10/9))/log(2))),Y/pow(2,ceil(log(ceil(H*10/9))/log(2)))),0.8/8,1.2/8)':weight_U=1:weight_V=1,scale=iw/2:ih/2 > > -y bandpass.png > > ffmpeg -i test.png -vf > scale=2*iw:2*ih,fftfilt=dc_Y=0:dc_U=0:dc_V=0:weight_Y='1-between(hypot(X/pow(2,ceil(log(ceil(W*10/9))/log(2))),Y/pow(2,ceil(log(ceil(H*10/9))/log(2)))),0.8/8,1.2/8)':weight_U=1:weight_V=1,scale=iw/2:ih/2 > > -y notch.png > > > _______________________________________________ > ffmpeg-user mailing list > ffmpeg-user@ffmpeg.org > https://ffmpeg.org/mailman/listinfo/ffmpeg-user > > To unsubscribe, visit link above, or email > ffmpeg-user-requ...@ffmpeg.org with subject "unsubscribe". > _______________________________________________ ffmpeg-user mailing list ffmpeg-user@ffmpeg.org https://ffmpeg.org/mailman/listinfo/ffmpeg-user To unsubscribe, visit link above, or email ffmpeg-user-requ...@ffmpeg.org with subject "unsubscribe".
