[FFmpeg-trac] #3751(avfilter:reopened): Identity Hald CLUT Introduces Color Shift

FFmpeg trac at avcodec.org
Sat Jul 5 19:09:18 CEST 2014


#3751: Identity Hald CLUT Introduces Color Shift
-------------------------------------+------------------------------------
             Reporter:  aguo         |                    Owner:
                 Type:  defect       |                   Status:  reopened
             Priority:  normal       |                Component:  avfilter
              Version:  unspecified  |               Resolution:
             Keywords:  haldclut     |               Blocked By:
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
-------------------------------------+------------------------------------
Changes (by JohnL):

 * status:  closed => reopened
 * resolution:  needs_more_info =>


Comment:

 Regardless of the problems with the quelsolaar.com identity clut, a
 generated identity HALD CLUT also exhibits the color shift.  The following
 examples shows it is actually swapping the red and blue color channels.

 {{{
 ffmpeg -y -v verbose -i rgb.png -filter_complex
 haldclutsrc=8[clut],[0][clut]haldclut=shortest=1 output%d.png
 }}}


 {{{
 ffmpeg version 2.2.3 Copyright (c) 2000-2014 the FFmpeg developers
   built on Jun  3 2014 06:51:16 with Apple LLVM version 5.1
 (clang-503.0.40) (based on LLVM 3.4svn)
   configuration: --prefix=/usr/local/Cellar/ffmpeg/2.2.3 --enable-shared
 --enable-pthreads --enable-gpl --enable-version3 --enable-nonfree
 --enable-hardcoded-tables --enable-avresample --enable-vda --cc=clang
 --host-cflags= --host-ldflags= --enable-libx264 --enable-libfaac --enable-
 libmp3lame --enable-libxvid
   libavutil      52. 66.100 / 52. 66.100
   libavcodec     55. 52.102 / 55. 52.102
   libavformat    55. 33.100 / 55. 33.100
   libavdevice    55. 10.100 / 55. 10.100
   libavfilter     4.  2.100 /  4.  2.100
   libavresample   1.  2.  0 /  1.  2.  0
   libswscale      2.  5.102 /  2.  5.102
   libswresample   0. 18.100 /  0. 18.100
   libpostproc    52.  3.100 / 52.  3.100
 Input #0, image2, from 'rgb.png':
   Duration: 00:00:00.04, start: 0.000000, bitrate: N/A
     Stream #0:0: Video: png, rgba, 271x271 [SAR 2834:2834 DAR 1:1], 25
 tbr, 25 tbn, 25 tbc
 [Parsed_haldclutsrc_0 @ 0x7ff05040c0e0] size:0x0 rate:25/1
 duration:-1.000000 sar:1/1
 [graph 0 input from stream 0:0 @ 0x7ff05040bba0] w:271 h:271 pixfmt:rgba
 tb:1/25 fr:25/1 sar:2834/2834 sws_param:flags=2
 [Parsed_haldclut_1 @ 0x7ff05040c380] [framesync @ 0x106682040] Selected
 1/25 time base
 [Parsed_haldclut_1 @ 0x7ff05040c380] [framesync @ 0x106682040] Sync level
 2
 Output #0, image2, to 'output%d.png':
   Metadata:
     encoder         : Lavf55.33.100
     Stream #0:0: Video: png, rgba, 271x271 [SAR 2834:2834 DAR 1:1],
 q=2-31, 200 kb/s, 90k tbn, 25 tbc
 Stream mapping:
   Stream #0:0 (png) -> haldclut:main
   haldclut -> Stream #0:0 (png)
 Press [q] to stop, [?] for help
 [Parsed_haldclut_1 @ 0x7ff05040c380] [framesync @ 0x106682040] Sync level
 1
 [Parsed_haldclut_1 @ 0x7ff05040c380] [framesync @ 0x106682040] Sync level
 0
 No more output streams to write to, finishing.
 frame=    1 fps=0.0 q=0.0 Lsize=N/A time=00:00:00.04 bitrate=N/A
 video:6kB audio:0kB subtitle:0 data:0 global headers:0kB muxing overhead
 -100.338982%
 }}}

 rgb.png:
 [[Image(http://www.kirupa.com/images/rgb_image.png)]]


 output1.png:
 [[Image(http://i58.tinypic.com/rsal4k.png)]]

--
Ticket URL: <https://trac.ffmpeg.org/ticket/3751#comment:4>
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