On Mon, Apr 10, 2006 at 07:14:17PM +0200, Nicolas MAUFRAIS wrote: > On Mon, Apr 10, 2006 at 09:35:29AM +0200, Stefan M. Fendt wrote: > > Stefan M. Fendt schrieb: > > > > >Some additional tests: > > > > > > > > This becomes weird... > > > > Now, I did use _exactly_ the same commandline as you for the sequence > > you sent me... but, no golfball, no green... ?!? Could you pls. mail me > > one example frame (TGA,with framenumber) out of "04.yuv" processed by > > that commandline on your machine? I repeated the test by using my > > neutral gray-chart and still... no green... weired... > > Hello, > > I confirm there's a really strong green tint over my encoded video. > Unfortunately, I didn't find any suitable extract to put on the > internet (there're kids on the picture). I'm searching for a part of the > video and I'll upload it. > I think I probably over-denoised the chroma. > > Nicolas.
OK. I put on the internet the encoded extracts. For those of you who are interested in the original YUV file, it can be downloaded here: http://www.europephoto.com/info/montage_video/04.yuv.tgz The AC3 stream if you want to mplex the streams: http://www.europephoto.com/info/montage_video/04_extract.ac3 For my test, I did use different parameters for yuvdenoise and mjpegtools versions. The CVS mjpegtools are installed on my computer with the _cvs_20060409 suffix. Normal encoded video (no green tint): yuvcorrect -v 0 -T INTERLACED_BOTTOM_FIRST | yuvscaler -v 0 -I ACTIVE_702x560+8+8 -M BICUBIC | y4mspatialfilter -L 4,0.94,4,0.94 -C 3,0.94,3,0.94 | yuvmedianfilter -v 0 -t 0 | yuvdenoise -v 0 -s 1,2,2 -g 0,0,0 -t 2,3,3 | mpeg2enc -v 0 -K tmpgenc -r 32 -4 1 -2 1 -D 10 -E 10 -g 15 -G 15 -q 5 -b 9500 -f 8 -o $1 The result is: http://www.europephoto.com/info/montage_video/test_v18.m2v The encoded video with a green tint: yuvcorrect_cvs_20060409 -v 0 -T INTERLACED_BOTTOM_FIRST | yuvscaler_cvs_20060409 -v 0 -I ACTIVE_702x560+8+8 -M BICUBIC | y4mspatialfilter_cvs_20060409 -L 4,0.94,4,0.94 -C 3,0.94,3,0.94 | yuvmedianfilter_cvs_20060409 -v 0 -t 0 | yuvdenoise_cvs_20060409 -v 0 -m6,24,24 -t12,24,24 -M3,24,24 | mpeg2enc_cvs_20060409 -v 0 -K tmpgenc -r 32 -4 1 -2 1 -D 10 -E 10 -g 15 -G 15 -q 5 -b 9500 -f 8 -o $1 The result is: http://www.europephoto.com/info/montage_video/test_v19.m2v As I said before, I think the problem comes from over-denoising the chroma channel. I read this in the Mjpeg howto: Sometimes, depending on the source material, median filtering of the chroma can cause a slight color shift towards green. Filtering on the luma component (disabling the chroma filtering) is the solution to that problem. As just put on the internet the encoded videos to show you the problem. I'm doing some tests right now. 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
