astroelectronic at t-online.de
Thu Oct 14 13:58:57 EEST 2021
Am 14.10.2021 um 12:53 schrieb Paul B Mahol:
> On Thu, Oct 14, 2021 at 12:29 PM Michael Koch <astroelectronic at t-online.de>
>> 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?
Because I first make the left half of the test image, then transpose it
and then hstack them together
The fftfilt examples do of course work with any aspect ratio.
More information about the ffmpeg-user