Hi On Tuesday 07 June 2005 15:15, notnot at xs4all.nl wrote:
Hello all,
I'm encoding a computer animation which has very subtle moving gradients, the color is nearly grey. I generate mpeg-2 files with low compression from piped .ppm images. During quiet moments in the animation, you see ugly banding artefacts. When there is more motion, I cannot see the banding any more. Are there any low-level settings I can change to increase quality? Right now, this is my command :
PleinMuseum final.script | ffmpeg -f imagepipe -img pnm \ -i - -i bounce_0506.wav \ -target "pal-dvd" -aspect 4:3 -acodec mp2 -ab 128 \ -hq -b 8000 -maxrate 8000 -minrate 8000 -dc 10 PM-DV-p1.mpg
I'm very interested in any tips to improve quality, but sadly I'm running out of time for the deadline...
does the banding also occur with lossless codecs / is in the original? if yes its obviously not ffmpegs fault, and trivial to fix, just add a tiny bit of noise you can also try NSSE as compare function and a constant qscale of 1 (dont forget -qmin 1 though) [...] -- Michael