[FFmpeg-trac] #7451(avcodec:new): mjpeg movies have lifted black

FFmpeg trac at avcodec.org
Fri Sep 21 05:10:18 EEST 2018

#7451: mjpeg movies have lifted black
             Reporter:  fnordware  |                     Type:  defect
               Status:  new        |                 Priority:  normal
            Component:  avcodec    |                  Version:  unspecified
             Keywords:  mjpeg      |               Blocked By:
             Blocking:             |  Reproduced by developer:  0
Analyzed by developer:  0          |
 Summary of the bug: If I start with a PNG sequence or ProRes movie that
 has areas of black pixels and transcode to mjpeg, the black areas are not
 quite black. This can be verified by converting the mjpeg movie back to

 How to reproduce:
 % ffmpeg -i  -start_number 0 -framerate 30.0 -i input.%03d.png -c:v mjpeg
 -q 3 output.mov

 % ffmpeg -i output.mov verify.%03d.png

 ffmpeg version 4.0.2-tessus Copyright (c) 2000-2018 the FFmpeg developers
   built with Apple LLVM version 9.1.0 (clang-902.0.39.2)


Ticket URL: <https://trac.ffmpeg.org/ticket/7451>
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