[FFmpeg-trac] #4683(undetermined:new): mjpeg: 12bpp fix artefacts

[FFmpeg]

#4683: mjpeg: 12bpp fix artefacts
-------------------------------------+-------------------------------------
               Reporter:  ami_stuff  |                  Owner:
                   Type:  defect     |                 Status:  new
               Priority:  normal     |              Component:
                Version:             |  undetermined
  unspecified                        |               Keywords:
             Blocked By:             |               Blocking:
Reproduced by developer:  0          |  Analyzed by developer:  0
-------------------------------------+-------------------------------------
 artefacts on the logo

 {{{
 C:\>ffmpeg -i 12bpp.jpg out.bmp
 ffmpeg version N-73189-g7728d23 Copyright (c) 2000-2015 the FFmpeg
 developers
   built with gcc 4.9.2 (GCC)
   configuration: --enable-gpl --enable-version3 --disable-w32threads
 --enable-av
 isynth --enable-bzlib --enable-fontconfig --enable-frei0r --enable-gnutls
 --enab
 le-iconv --enable-libass --enable-libbluray --enable-libbs2b --enable-
 libcaca --
 enable-libdcadec --enable-libfreetype --enable-libgme --enable-libgsm
 --enable-l
 ibilbc --enable-libmodplug --enable-libmp3lame --enable-libopencore-amrnb
 --enab
 le-libopencore-amrwb --enable-libopenjpeg --enable-libopus --enable-
 librtmp --en
 able-libschroedinger --enable-libsoxr --enable-libspeex --enable-libtheora
 --ena
 ble-libtwolame --enable-libvidstab --enable-libvo-aacenc --enable-libvo-
 amrwbenc
  --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp
 --enabl
 e-libx264 --enable-libx265 --enable-libxavs --enable-libxvid --enable-lzma
 --ena
 ble-decklink --enable-zlib
   libavutil      54. 27.100 / 54. 27.100
   libavcodec     56. 45.100 / 56. 45.100
   libavformat    56. 38.102 / 56. 38.102
   libavdevice    56.  4.100 / 56.  4.100
   libavfilter     5. 18.100 /  5. 18.100
   libswscale      3.  1.101 /  3.  1.101
   libswresample   1.  2.100 /  1.  2.100
   libpostproc    53.  3.100 / 53.  3.100
 Input #0, image2, from '12bpp.jpg':
   Duration: 00:00:00.04, start: 0.000000, bitrate: 65308 kb/s
     Stream #0:0: Video: mjpeg, gray16le(12 bpc, bt470bg/unknown/unknown),
 999x74
 9 [SAR 300:300 DAR 999:749], 25 tbr, 25 tbn, 25 tbc
 Output #0, image2, to 'out.bmp':
   Metadata:
     encoder         : Lavf56.38.102
     Stream #0:0: Video: bmp, gray, 999x749 [SAR 1:1 DAR 999:749], q=2-31,
 200 kb
 /s, 25 fps, 25 tbn, 25 tbc
     Metadata:
       encoder         : Lavc56.45.100 bmp
 Stream mapping:
   Stream #0:0 -> #0:0 (mjpeg (native) -> bmp (native))
 Press [q] to stop, [?] for help
 frame=    1 fps=0.0 q=0.0 Lsize=N/A time=00:00:00.04 bitrate=N/A
 video:732kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB
 muxing o
 verhead: unknown
 }}}

--
Ticket URL: <https://trac.ffmpeg.org/ticket/4683>
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