Hallo Bernhard, On Tue, Jun 20, 2006 at 06:54:17PM +0200, Bernhard Praschinger wrote: > So when you set a active are like 100x100+100+100, you have two > different colors ? > What color do you get when you convert mpeg to jpeg/tiff ?
According to that picture : http://www.europephoto.com/info/output_normal_brightness.png Inside part (not blacked out by yuvscaler) R-G-B 1-1-1 Outside part (not blacked out by yuvscaler) R-G-B 16-16-16 > Do you get a different color when you don't use y4mscaler ? > Could you post 2 jpeg's of that test (on black encoded, and the other > with y4mscaler). Well, the screenshots I posted are really screenshots of the mpeg generated by mpeg2enc. If I don't use yuvscaler, I obtain the "normal" picture which contains a lot of noise since the input is an Hi8 tape. The screenshot I posted are the start part of the video. > That lookes strange. What output driver did you use and what program to > capture the output ? Here's the way I generated the screenshots : - I rendered an mpeg from an YUV4MPEG4 stream made with Cinelerra. The stream is encoded with mpeg2enc using that syntax : yuvcorrect -v 0 -T INTERLACED_BOTTOM_FIRST | yuvscaler -v 0 -I ACTIVE_700x560+8+8 | y4mshift -n 2 | mpeg2enc -v 0 -K tmpgenc -r 32 -4 1 -2 1 -D 10 -E 10 -g 15 - G 15 -q 6 -b 9400 -f 8 -o $1 - I then import back the video in Cinelerra. I then can render a screenshot The bug does not come from Cinelerra, since I can see the colour difference when playing the mpeg with mplayer or xine, and increasing the brightness. Thanks Bernhard! Nicolas, Paris. _______________________________________________ Mjpeg-users mailing list Mjpeg-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/mjpeg-users
