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). Devin -- Devin Heitmueller, Senior Software Engineer LTN Global Communications o: +1 (301) 363-1001 w: https://ltnglobal.com e: devin.heitmuel...@ltnglobal.com _______________________________________________ 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".
