Am 27.12.2023 um 23:04 schrieb Devin Heitmueller:
On Wed, Dec 27, 2023 at 4:51 PM Michael Koch
<astroelectro...@t-online.de> wrote:
Hi,
I'm using this command line to print four consecutive random numbers:
ffmpeg -loglevel repeat -f lavfi -i color=gray:size=1x1,format=gray -vf
geq=lum='st(0,0.123);print(random(0));print(random(0));print(random(0));print(random(0));0'
-frames 1 -y out.png
The output is always the same four numbers:
0.000000
0.000091
0.285346
0.929202
Why is the first number always zero, even if I write different seed
values (here: 0.123) into variable 0?
From: https://ffmpeg.org/ffmpeg-utils.html
"Return a pseudo random value between 0.0 and 1.0. x is the index of
the internal variable which will be used to save the seed/state."
If you're looking for a value between 1 and N, you can probably just
multiply it by N (i.e. N=1000, 0.285 * 1000 = 285).
In my example I'm using the index x=0 and I did set the seed value to
0.123.
It's clear that the random function returns values between 0 and 1.
My question is why the seed value is ignored.
Michael
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