[FFmpeg-trac] #4827(avcodec:new): Many warnings shown when decoding j2k (was: Many warnings and artefacts shown when decoding j2k)

[FFmpeg]

#4827: Many warnings shown when decoding j2k
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             Reporter:  cehoyos     |                    Owner:
                 Type:  defect      |                   Status:  new
             Priority:  minor       |                Component:  avcodec
              Version:  git-master  |               Resolution:
             Keywords:  j2k         |               Blocked By:
             Blocking:              |  Reproduced by developer:  0
Analyzed by developer:  0           |
------------------------------------+-----------------------------------
Changes (by cehoyos):

 * priority:  normal => minor


Comment:

 The artefacts are produced by the colourspace conversion as can be shown
 for example with the following command line, the output shows no
 artefacts:
 {{{
 $ ffmpeg -i frm_000127.j2c -vcodec libopenjpeg out.j2k
 ffmpeg version N-74866-g0cdba4a Copyright (c) 2000-2015 the FFmpeg
 developers
   built with gcc 4.7 (SUSE Linux)
   configuration: --enable-gpl --enable-libopenjpeg
   libavutil      54. 31.100 / 54. 31.100
   libavcodec     56. 60.100 / 56. 60.100
   libavformat    56. 40.101 / 56. 40.101
   libavdevice    56.  4.100 / 56.  4.100
   libavfilter     5. 40.101 /  5. 40.101
   libswscale      3.  1.101 /  3.  1.101
   libswresample   1.  2.101 /  1.  2.101
   libpostproc    53.  3.100 / 53.  3.100
 [jpeg2000 @ 0x2107960] End mismatch 1
     Last message repeated 4 times
 [jpeg2000 @ 0x2107960] End mismatch 2
     Last message repeated 1 times
 [jpeg2000 @ 0x2107960] End mismatch 1
     Last message repeated 28 times
 [jpeg2000 @ 0x2107960] End mismatch 2
 [jpeg2000 @ 0x2107960] End mismatch 1
     Last message repeated 19 times
 Input #0, j2k_pipe, from 'frm_000127.j2c':
   Duration: N/A, bitrate: N/A
     Stream #0:0: Video: jpeg2000 (JPEG 2000 digital cinema 2K), xyz12le,
 2048x858, 25 tbr, 25 tbn, 25 tbc
 Output #0, image2, to 'out.j2k':
   Metadata:
     encoder         : Lavf56.40.101
     Stream #0:0: Video: jpeg2000 (libopenjpeg), xyz12le, 2048x858, q=2-31,
 200 kb/s, 25 fps, 25 tbn, 25 tbc
     Metadata:
       encoder         : Lavc56.60.100 libopenjpeg
 Stream mapping:
   Stream #0:0 -> #0:0 (jpeg2000 (native) -> jpeg2000 (libopenjpeg))
 Press [q] to stop, [?] for help
 [jpeg2000 @ 0xd645ac0] End mismatch 1
     Last message repeated 4 times
 [jpeg2000 @ 0xd645ac0] End mismatch 2
     Last message repeated 1 times
 [jpeg2000 @ 0xd645ac0] End mismatch 1
     Last message repeated 28 times
 [jpeg2000 @ 0xd645ac0] End mismatch 2
 [jpeg2000 @ 0xd645ac0] End mismatch 1
     Last message repeated 19 times
 frame=    1 fps=0.0 q=-0.0 Lsize=N/A time=00:00:00.04 bitrate=N/A
 video:1639kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB
 muxing overhead: unknown
 }}}
 I created ticket #4829 for the libswscale issue.

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Ticket URL: <https://trac.ffmpeg.org/ticket/4827#comment:2>
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