On Sat, Apr 08, 2006 at 08:03:27AM +0200, Stefan M. Fendt wrote: > Nicolas MAUFRAIS schrieb: > > >Stefan, I thank you for all the information, but... how could I use an > >"horizontal lowpass-filter"? I read all the things you wrote, and even > >if that's probably right, I don't know how to test it. > > > > > OK, so here comes what I would try with this material: > > Since the horizontal resolution is very close to some reduced DVD > resolution, I would most probably use something like this (slow, but > usualy good quality on noisy sources): > > lav2yuv my_dv_files.avi |\ > y4mspatialfilter -L 4,x,0,1 -C 4,y,4,y |\ > yuvdenoise -m y0,u0,v0 -t y1,u1,v1 -M y2,u2,v2 |\ > yuvscaler -O SIZE_352x576 |\ > mpeg2enc -K kvcd -E -10 --cbr -b 5000 -R2 -41 -21 -r24 -o file.m2v > > Tune x until you can see some little blurring (for your HI8 source this > should happen arround 0.5), then go upwards a little again. Choose y to > be somewere near 0.3 to 0.5 (you wont notice for HI8 as chroma is bad > anyways, but the mpeg2enc will like that...). For the denoiser start > with y0 and leave all other values zero. Turn up y0 until you can see > the effect (it's too much then...) lower the threshold again by 1 or 2. > Choose 2*y0 for u0 and v0 as a starting point and finetune it the same > way as x,y,y0... Then tune the values for "-t" exactly the same way > (only that these may be magnitudes higher -- it is *not* a threshold > here but a mixing-value(!)) and if really needed do the same with the > values for "-M" (you can try the values from "-m" as a starting point > but most likely they are too high here...)
I tried y4mspatialfilter, but I'm not convinced with the bitrate reduction... > BTW: I would never go higher than approx 5Mbps... otherwise it *will* > knock some hardware-players out of buissnes... Yep, but my DVD will be read on a modern standalone player as the one I own, and that player can read stream at 9800kbps CBR bitrate without any problem. > PPS: feel free to send me a short sequence (or allow me to download it > somewere) of 30sec to 1min of the jpeg/dv data and I will try that > finetuning for you, if you like... let's see how low we can can that > bitrate... :-> Here it is: http://www.europephoto.com/info/montage_video/04.yuv.tgz The audio AC3 stream: http://www.europephoto.com/info/montage_video/04_extract.ac3 The command line I use for the moment is: yuvcorrect -v 0 -T INTERLACED_BOTTOM_FIRST | yuvscaler -v 0 -I ACTIVE_702x560+8+8 -M BICUBIC | y4mspatialfilter -L 5,0.94,1,1.00 -C 4,0.94,1,1.0 | yuvmedianfilter -v 0 -t 0 | yuvdenoise -v 0 -s 1,2,2 -g 0,0,0 -t 2,3,3 | mpeg2enc -v 0 -r 32 -4 1 -2 1 -D 10 -g 6 -G 15 -q 4 -b 9200 -f 8 -o $1 Thank you! Nicolas. ------------------------------------------------------- This SF.Net email is sponsored by xPML, a groundbreaking scripting language that extends applications into web and mobile media. Attend the live webcast and join the prime developer group breaking into this new coding territory! http://sel.as-us.falkag.net/sel?cmd=lnk&kid=110944&bid=241720&dat=121642 _______________________________________________ Mjpeg-users mailing list Mjpeg-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/mjpeg-users
