Artefacts decoding jpeg2000

[Carl Eugen Hoyos]

The sample from ticket #4602 shows artefacts.

$ ffmpeg -i order_progressive.jp2 out.png
ffmpeg version N-72808-gb58a3c8 Copyright (c) 2000-2015 the FFmpeg developers
  built with gcc 4.7 (SUSE Linux)
  configuration: --enable-gpl --enable-libopenjpeg
  libavutil      54. 27.100 / 54. 27.100
  libavcodec     56. 41.100 / 56. 41.100
  libavformat    56. 36.100 / 56. 36.100
  libavdevice    56.  4.100 / 56.  4.100
  libavfilter     5. 16.101 /  5. 16.101
  libswscale      3.  1.101 /  3.  1.101
  libswresample   1.  2.100 /  1.  2.100
  libpostproc    53.  3.100 / 53.  3.100
Input #0, j2k_pipe, from 'order_progressive.jp2':
  Duration: N/A, bitrate: N/A
    Stream #0:0: Video: jpeg2000 (JPEG 2000 codestream restriction 0), rgb24, 1200x1200, 25 tbr, 25 tbn, 25 tbc
Output #0, image2, to 'out.png':
  Metadata:
    encoder         : Lavf56.36.100
    Stream #0:0: Video: png, rgb24, 1200x1200, q=2-31, 200 kb/s, 25 fps, 25 tbn, 25 tbc
    Metadata:
      encoder         : Lavc56.41.100 png
Stream mapping:
  Stream #0:0 -> #0:0 (jpeg2000 (native) -> png (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:1040kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: unknown

[Michael Niedermayer]

Fixed, probably by e7adb02d3bc1a46421fd6e8a7e80e529b04707ef