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

FFmpeg trac at avcodec.org
Mon Mar 4 11:49:56 CET 2013

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

Comment (by sperate):

 Replying to [comment:10 richardpl]:
 > there is -vf colormatrix filter

 Yes, but this tends to become complicate as we only need to deal with

 The real question is :

 As there are so many videos with pixel ranges from 16 to 235,
 corresponding to old analog video standards and the necessity to pass
 synch signals under 0V and to avoid bursts in the image do to nervous
 response on the line, do we have to encode AVI's with 0-255 output range
 or do we need to have players that detects this reduces range and adapts
 to it by expanding the pixel range to 0-255 ?

Ticket URL: <https://ffmpeg.org/trac/ffmpeg/ticket/225#comment:11>
FFmpeg <http://ffmpeg.org>
FFmpeg issue tracker

More information about the FFmpeg-trac mailing list