[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
luminance.
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