[FFmpeg-trac] #2267(FFmpeg:new): contrast loss when encoding from h264 yuvj420p to mpeg4 yuv420p

[FFmpeg]

#2267: contrast loss when encoding from h264 yuvj420p to mpeg4 yuv420p
-------------------------------------+-------------------------------------
             Reporter:  sperate      |                     Type:  defect
               Status:  new          |                 Priority:  important
            Component:  FFmpeg       |                  Version:  1.1.2
             Keywords:  contrast     |               Blocked By:
  loss                               |  Reproduced by developer:  0
             Blocking:               |
Analyzed by developer:  0            |
-------------------------------------+-------------------------------------
 When trying to encode from ".mov" files from a camera to avi (mpeg4 or
 libxvid) the output movie colors seemed dull.
 I figured out it was a catrast loss.

 How to reproduce:
 {{{
 % ffmpeg -i input.MOV -b:v4000k output.AVI
 or
 % ffmeg -i input.MOV -b:v4000k -vcodec libxvid output.AVI

 ffmpeg version N-49610-gc2dd5a1 Copyright (c) 2000-2013 the FFmpeg
 developers
 built on Feb  5 2013 13:20:59 with gcc 4.7.2 (GCC)

 running on Windows XP
 }}}

 I get rid of the problem by trying to enhance the contrast with
 {{{
 -vf mp=eq=0:5
 }}}
 then figured out that just using the mplayer filter without modifing the
 contrast gave the best result
 {{{
 -vf mp=eq=0:0
 }}}

 It seems to be a color space problem fixed with this filter but there must
 be a better way of getting rid of this contrast loss ???

-- 
Ticket URL: <https://ffmpeg.org/trac/ffmpeg/ticket/2267>
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