mjpeg: 12bpp fix artefacts

[ami_stuff]

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

[Michael Niedermayer]

Fixed in dffae122d0f448029c30afc672233f114a3fe09c

[Christophe]

Can this sample be used as a fate sample? I mean, is it redistributable?

[Carl Eugen Hoyos]

Replying to kurosu:

Can this sample be used as a fate sample?

I mean, is it redistributable?

FFmpeg (the project) currently distributes the sample: Does this answer your question?

Please note that a large number of the samples currently in fate are definitely not distributable.

[Balling]

Improved in a8e2714d824552ed210118d1ce48c770db3d8c56 but as mentioned we need more tests and more samples.

[Balling]

Very nice improvement. Literally the evaluation version star got improved substantially (not everywhere, but...). Not to mention that some bytes that were pure white was not pure white before. LOL??!