[FFmpeg-trac] #3794(swscale:new): SWSCALE: Quantization Errors in Y Studio Range

FFmpeg trac at avcodec.org
Thu Jul 24 20:25:37 CEST 2014


#3794: SWSCALE: Quantization Errors in Y Studio Range
------------------------------------+-----------------------------------
             Reporter:  troy_s      |                    Owner:
                 Type:  defect      |                   Status:  new
             Priority:  normal      |                Component:  swscale
              Version:  git-master  |               Resolution:
             Keywords:              |               Blocked By:
             Blocking:              |  Reproduced by developer:  0
Analyzed by developer:  0           |
------------------------------------+-----------------------------------

Comment (by troy_s):

 Sorry if I misunderstand but the idea is of course that you provide the
 actual command line that allows to reproduce the issue you see.

 Apologies. The following is the fully corrected command to generate the
 raw YCbCr file output to test-studio.yuv using REC.709 coefficients:

 {{{
 ./ffmpeg -i ~/Documents/FFMPEG\ Color\ Research/ARIB_STD-B28.png -pix_fmt
 yuv444p -vcodec rawvideo -f rawvideo -vf
 scale="in_range=full:in_color_matrix=bt709:out_range=mpeg:out_color_matrix=bt709"
 test-studio.yuv
 ffmpeg version N-64958-gce8e27e Copyright (c) 2000-2014 the FFmpeg
 developers
   built on Jul 24 2014 10:54:07 with gcc 4.7 (Ubuntu/Linaro
 4.7.3-12ubuntu1)
   configuration: --enable-gpl --enable-libx264 --enable-shared --disable-
 static --enable-pic
   WARNING: library configuration mismatch
   avutil      configuration: --enable-gpl --enable-libx264 --disable-asm
 --enable-shared --disable-static --enable-pic
   avcodec     configuration: --enable-gpl --enable-libx264 --disable-asm
 --enable-shared --disable-static --enable-pic
   avformat    configuration: --enable-gpl --enable-libx264 --disable-asm
 --enable-shared --disable-static --enable-pic
   avdevice    configuration: --enable-gpl --enable-libx264 --disable-asm
 --enable-shared --disable-static --enable-pic
   avfilter    configuration: --enable-gpl --enable-libx264 --disable-asm
 --enable-shared --disable-static --enable-pic
   swscale     configuration: --enable-gpl --enable-libx264 --disable-asm
 --enable-shared --disable-static --enable-pic
   swresample  configuration: --enable-gpl --enable-libx264 --disable-asm
 --enable-shared --disable-static --enable-pic
   postproc    configuration: --enable-gpl --enable-libx264 --disable-asm
 --enable-shared --disable-static --enable-pic
   libavutil      52. 92.101 / 52. 92.101
   libavcodec     55. 69.100 / 55. 69.100
   libavformat    55. 49.100 / 55. 49.100
   libavdevice    55. 13.102 / 55. 13.102
   libavfilter     4. 11.102 /  4. 11.102
   libswscale      2.  6.100 /  2.  6.100
   libswresample   0. 19.100 /  0. 19.100
   libpostproc    52.  3.100 / 52.  3.100
 Input #0, image2, from '/home/aphorism/Documents/FFMPEG Color
 Research/ARIB_STD-B28.png':
   Duration: 00:00:00.04, start: 0.000000, bitrate: N/A
     Stream #0:0: Video: png, rgb24, 1920x1080 [SAR 2835:2835 DAR 16:9], 25
 tbr, 25 tbn, 25 tbc
 Output #0, rawvideo, to 'test-studio.yuv':
   Metadata:
     encoder         : Lavf55.49.100
     Stream #0:0: Video: rawvideo (444P / 0x50343434), yuv444p, 1920x1080
 [SAR 1:1 DAR 16:9], q=2-31, 200 kb/s, 25 fps, 25 tbn, 25 tbc
     Metadata:
       encoder         : Lavc55.69.100 rawvideo
 Stream mapping:
   Stream #0:0 -> #0:0 (png (native) -> rawvideo (native))
 Press [q] to stop, [?] for help
 frame=    1 fps=0.0 q=0.0 Lsize=    6075kB time=00:00:00.04
 bitrate=1244160.0kbits/s
 video:6075kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB
 muxing overhead: 0.000000%
 aphorism at u64x6:~/Develop/ffmpeg$ convert -depth 8 -size 1920x1080
 -interlace plane Gray:./test-studio.yuv -set colorspace RGB test-
 studio.png
 aphorism at u64x6:~/Develop/ffmpeg$ convert test-studio-* -set colorspace RGB
 -combine test-studio-444-out.png
 aphorism at u64x6:~/Develop/ffmpeg$ compare ./test-full-444-out.png
 ~/Documents/FFMPEG\ Color\ Research/ test-studio-diff.png
 }}}

--
Ticket URL: <https://trac.ffmpeg.org/ticket/3794#comment:8>
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