#225: Converting from YUVJ to YUV lose contrast ------------------------------+--------------------------- Reporter: sghpunk | Owner: Type: defect | Status: open Priority: normal | Component: undetermined Version: git-master | Resolution: Keywords: YUV/YUVJ contrast | Blocked By: Blocking: | Reproduced: 0 Analyzed: 0 | ------------------------------+---------------------------
Comment (by sghpunk): I do the same, as you described. And I can say... It is more complicated, than I thought... (ffmpeg -i out001.jpg out.png) - No differences, as you say. And here (ffmpeg -i out001.jpg -qscale 2 out.avi) begins a ... gm ... magic )) When I play out.avi with mplayer2 (http://www.mplayer2.org/), there is difference between jpg and avi (avi is less contrast), but when I play out.avi with KMplayer, there is no contrast differences... Only little white balance, but it is not so important. So. I don't understand, maybe it is mlayer2 bug, or ffmpeg bug but not in that place that I thought. (Because mplayer2 use the same ffmpeg for decoding video). I attached a screenshot with two opened mplayer2 windows (left - input file with normal contrast, right - output file with low contrast), seems like on this screenshot contrast differences looks good. (If not, you can in gimp test a color value in same white places on image, and see the difference). But I still cannot understand, why when i use yuv4mpeg raw file for encoding there is no contrast differences in mplayer2. About compiler options, I not test it so deep, I do this later, and maybe you can recommend what test I can perform to be sure is that options efficient or not. -- Ticket URL: <https://avcodec.org/trac/ffmpeg/ticket/225#comment:6> FFmpeg <http://ffmpeg.org> FFmpeg issue tracker _______________________________________________ FFmpeg-trac mailing list FFmpeg-trac@avcodec.org http://avcodec.org/mailman/listinfo/ffmpeg-trac