[FFmpeg-trac] #225(undetermined:open): Converting from YUVJ to YUV lose contrast

FFmpeg trac at avcodec.org
Fri May 20 20:25:25 CEST 2011

#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 cehoyos):

 I am unable to reproduce your problem:
 I extracted the jpeg's from your input file (ffmpeg -i yuvj_input.mkv
 -vcodec copy out%03d.jpg), converted the result to different formats
 (ffmpeg -i out001.jpg -qscale 2 out.avi and ffmpeg -i out001.jpg out.png),
 but the images all look very similar to me.
 What software are you using to display the videos (or how do you know the
 contrast is different?
 Can you also reproduce the problem with ffplay out001.jpg (and with ffplay

 Concerning your compilation: I believe your extra-cflags affect the
 performance of the resulting binary negatively, if this is wrong, please
 report it, so we can fix the build process.

Ticket URL: <https://avcodec.org/trac/ffmpeg/ticket/225#comment:5>
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