Hallo > Has anyone noticed mpeg2enc rc92 creating odd "flashing" artifacts on > what should be otherwise generally smooth color backgrounds? I've > attached a small jpeg (29k) showing an example of the artifact. If > you look to the right of the tall actor's shoulder, you can see very > clearly what I'm talking about, it's a nice herringbone pattern of > mpeg encoding subblocks (I'm not sure of the official name). When > playing this video file, the herringbone pattern fades in slowly, > then disappears. And this frame is not the only instance, it's just > the one I paused on to capture to jpeg. > > The mpeg2enc encoding parameters I used (yes, I know some of these > are defaults, but...) is my standard entry I've been using for > Carnivale (the frame is from about 14 seconds into this past Sunday's > Carnivale on HBO), which is: > > -f 5 -n n -a 2 -V 230 -B 224 -S 8000 -b 9576 -q 10 -I 1 -G 54 -H > -N 0.0 -X 200 -Q 4.0 -R 0 -d -4 4 -2 4 What is the -X option ?!?! What I don't understand is why you set a extra high bitrate (-b) and want extra low quality -q -4 -2 -Q. I gues some of you problems could vanish if you use the defaults for -4 and -2.
> The only difference between this set of parameters and the set I have > been using with rc91 is the addition of "-R 0" to obtain only P > frames. An encoding run of Carnivale with rc91 produces an encoded > file that's just as I've been accustomed to obtaining. There are > no artifacts visible to me on screen when I play the same section of > the rc91 encoding. > > I'll leave a run of rc92 without -R 0 running overnight to see what > it does when encoding both P & B frames and report the results in the > morning. auf hoffentlich bald, Berni the Chaos of Woodquarter Email: [EMAIL PROTECTED] www: http://www.lysator.liu.se/~gz/bernhard ------------------------------------------------------- This SF.net email is sponsored by OSDN's Audience Survey. Help shape OSDN's sites and tell us what you think. Take this five minute survey and you could win a $250 Gift Certificate. http://www.wrgsurveys.com/2003/osdntech03.php?site=8 _______________________________________________ Mjpeg-users mailing list [EMAIL PROTECTED] https://lists.sourceforge.net/lists/listinfo/mjpeg-users
