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

FFmpeg trac at avcodec.org
Fri Mar 13 21:32:24 CET 2015

#225: Converting from YUVJ to YUV lose contrast
             Reporter:  sghpunk      |                    Owner:
                 Type:  defect       |                   Status:  reopened
             Priority:  normal       |                Component:  swscale
              Version:  git-master   |               Resolution:
             Keywords:  YUV/YUVJ     |               Blocked By:
  contrast                           |  Reproduced by developer:  0
             Blocking:               |
Analyzed by developer:  0            |
Changes (by KlausW):

 * cc: sxxe@… (added)


 i have the same problem of contrast loss as described here.
 It happens while using the delogo and vidstabtransform filters (They do
 the color space conversion).

 So far i was able to skirt the problem by using the mplayer filter
 The "trick" is mentioned above.

 Sadly with the latest ffmpeg (2.6) release this mplayer filter does not
 exists anymore, it's now a native filter "eq" which acts totally different
 and can not be used to skirt the problem anymore. (At least i was not able
 to figure out how)

 Does anyone know how else i could avoid the contrast loss?

 kind regards,

Ticket URL: <https://trac.ffmpeg.org/ticket/225#comment:25>
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