[FFmpeg-trac] #2847(avfilter:new): 3D_LUT_Filter seems to work incorrect

[FFmpeg]

#2847: 3D_LUT_Filter seems to work incorrect
-------------------------------------+-------------------------------------
             Reporter:  rainer       |                     Type:  defect
  fritz                              |                 Priority:  normal
               Status:  new          |                  Version:  2.0
            Component:  avfilter     |               Blocked By:
             Keywords:  3d lut       |  Reproduced by developer:  0
  conversion                         |
             Blocking:               |
Analyzed by developer:  0            |
-------------------------------------+-------------------------------------
 Summary of the bug:
 I'm working a lot with ARRI Alexa LOG-C footage and tried to convert it
 with the new 3d_lut filter.
 The result differs a lot with a file which I converted via Davinci Resolve
 built in LOG-C to REC709
 LUT and one which was downloaded from the ARRI LUT Generator.
 The Gamma seems to be ok but the colors seems to be incorrect.

 How to reproduce:
 I can upload sample files to your ftp where you can try yourself.
 Take a LOG-C Alexa Quicktime Prores 4444 file and convert it.
 {{{
 % ffmpeg -i /Volumes/6TB_RAID5/ffmpeg_3DLUT/Source_LOGC_Alexa_trim.mov -s
 1920x1080 -vf
 lut3d="/Volumes/6TB_RAID5/ffmpeg_3DLUT/ArriAlexaLogCtoRec709.dat" -vcodec
 prores_ks -pix_fmt yuv422p
 /Volumes/6TB_RAID5/ffmpeg_3DLUT/Alexa_LogC_LUT_converted_ffmpeg.mov

 ffmpeg version 2.0
 built on Mac OSX 10.8.3

 ffmpeg version 2.0 Copyright (c) 2000-2013 the FFmpeg developers
   built on Jul 23 2013 10:30:44 with llvm-gcc 4.2.1 (LLVM build
 2336.11.00)
   configuration: --enable-gpl --enable-version3 --enable-nonfree --enable-
 static --disable-shared --enable-postproc --enable-libass --enable-libcelt
 --enable-libfaac --enable-libfdk-aac --enable-libfreetype --enable-
 libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-
 openssl --enable-libtheora --enable-libvo-aacenc --enable-libvorbis
 --enable-libvpx --enable-libx264 --enable-libxvid
   libavutil      52. 38.100 / 52. 38.100
   libavcodec     55. 18.102 / 55. 18.102
   libavformat    55. 12.100 / 55. 12.100
   libavdevice    55.  3.100 / 55.  3.100
   libavfilter     3. 79.101 /  3. 79.101
   libswscale      2.  3.100 /  2.  3.100
   libswresample   0. 17.102 /  0. 17.102
   libpostproc    52.  3.100 / 52.  3.100
 Input #0, mov,mp4,m4a,3gp,3g2,mj2, from
 '/Volumes/6TB_RAID5/ffmpeg_3DLUT/Source_LOGC_Alexa_trim.mov':
   Metadata:
     major_brand     : qt
     minor_version   : 537199360
     compatible_brands: qt
     creation_time   : 2013-08-09 12:49:47
     timecode        : 22:32:19:04
   Duration: 00:00:00.36, start: 0.000000, bitrate: 405676 kb/s
     Stream #0:0(eng): Video: prores (ap4h / 0x68347061), yuv444p10le,
 2048x1536, 405549 kb/s, SAR 1:1 DAR 4:3, 25 fps, 25 tbr, 25 tbn, 25 tbc
     Metadata:
       creation_time   : 2013-08-09 12:49:47
       handler_name    : Apple Alias-Datensteuerung
     Stream #0:1(eng): Data: none (tmcd / 0x64636D74), 0 kb/s
     Metadata:
       creation_time   : 2013-08-09 12:49:47
       handler_name    : Apple Alias-Datensteuerung
       timecode        : 22:32:19:04
 Incompatible pixel format 'yuv422p' for codec 'prores_ks', auto-selecting
 format 'yuv422p10le'
 Output #0, mov, to
 '/Volumes/6TB_RAID5/ffmpeg_3DLUT/Alexa_LogC_LUT_converted_ffmpeg.mov':
   Metadata:
     major_brand     : qt
     minor_version   : 537199360
     compatible_brands: qt
     timecode        : 22:32:19:04
     encoder         : Lavf55.12.100
     Stream #0:0(eng): Video: prores (prores_ks) (apcn / 0x6E637061),
 yuv422p10le, 1920x1080 [SAR 3:4 DAR 4:3], q=2-31, 200 kb/s, 12800 tbn, 25
 tbc
     Metadata:
       creation_time   : 2013-08-09 12:49:47
       handler_name    : Apple Alias-Datensteuerung
 Stream mapping:
   Stream #0:0 -> #0:0 (prores -> prores_ks)
 Press [q] to stop, [?] for help
 frame=    9 fps=2.9 q=0.0 Lsize=    5678kB time=00:00:00.36
 bitrate=129214.3kbits/s
 video:5677kB audio:0kB subtitle:0 global headers:0kB muxing overhead
 0.025735%
 k-effectss-MacBook-Pro:~ k-effects$

 }}}
 Patches should be submitted to the ffmpeg-devel mailing list and not this
 bug tracker.

-- 
Ticket URL: <https://ffmpeg.org/trac/ffmpeg/ticket/2847>
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