Opened 12 years ago

Closed 12 years ago

#842 closed defect (fixed)

ljpeg decodes incorrectly

Reported by: ami_stuff Owned by:
Priority: normal Component: avcodec
Version: unspecified Keywords: mjpeg ljpeg
Cc: Blocked By:
Blocking: Reproduced by developer: yes
Analyzed by developer: no

Description

ftp://65.66.246.92/pub/GraphicsMagick/delegates/ljpeg-6b.tar.gz

C:\>ffmpeg -i testimgl.jpg out.bmp
ffmpeg version N-36193-gf514695, Copyright (c) 2000-2011 the FFmpeg developers
  built on Dec 26 2011 17:50:37 with gcc 4.6.2
  configuration: --enable-gpl --enable-version3 --disable-w32threads --enable-ru
ntime-cpudetect --enable-avisynth --enable-bzlib --enable-frei0r --enable-libope
ncore-amrnb --enable-libopencore-amrwb --enable-libfreetype --enable-libgsm --en
able-libmp3lame --enable-libopenjpeg --enable-librtmp --enable-libschroedinger -
-enable-libspeex --enable-libtheora --enable-libvo-aacenc --enable-libvo-amrwben
c --enable-libvorbis --enable-libvpx --enable-libx264 --enable-libxavs --enable-
libxvid --enable-zlib
  libavutil      51. 33.100 / 51. 33.100
  libavcodec     53. 48.100 / 53. 48.100
  libavformat    53. 28.100 / 53. 28.100
  libavdevice    53.  4.100 / 53.  4.100
  libavfilter     2. 54.100 /  2. 54.100
  libswscale      2.  1.100 /  2.  1.100
  libswresample   0.  5.100 /  0.  5.100
  libpostproc    51.  2.100 / 51.  2.100
Input #0, image2, from 'testimgl.jpg':
  Duration: 00:00:00.04, start: 0.000000, bitrate: N/A
    Stream #0:0: Video: mjpeg, bgr24, 227x149, 25 tbr, 25 tbn, 25 tbc
[buffer @ 020F1820] w:227 h:149 pixfmt:bgr24 tb:1/1000000 sar:0/1 sws_param:
Output #0, image2, to 'out.bmp':
  Metadata:
    encoder         : Lavf53.28.100
    Stream #0:0: Video: bmp, bgr24, 227x149, q=2-31, 200 kb/s, 90k tbn, 25 tbc
Stream mapping:
  Stream #0:0 -> #0:0 (mjpeg -> bmp)
Press [q] to stop, [?] for help
frame=    1 fps=  0 q=0.0 Lsize=       0kB time=00:00:00.04 bitrate=   0.0kbits/
s
video:100kB audio:0kB global headers:0kB muxing overhead -100.000000%

Attachments (1)

testimgl.jpg (37.5 KB ) - added by ami_stuff 12 years ago.

Download all attachments as: .zip

Change History (4)

by ami_stuff, 12 years ago

Attachment: testimgl.jpg added

comment:1 by ami_stuff, 12 years ago

Color depth: 24bpp
Mode: Lossless
Bits per sample: 8
Samples per pixel: 3
Subsampling: 1:1:1 (11:11:11)
Interleaved: Yes
Color space: RGB
Lossless Predictor: 4
Lossless Point Transform: 1
Compression: Huffman

comment:2 by Carl Eugen Hoyos, 12 years ago

Component: undeterminedavcodec
Keywords: mjpeg ljpeg added
Summary: jpeg lossless decodes incorrectlyljpeg decodes incorrectly

My suspicion is that the sample does not confirm to the latest specification...

(And remember that there is "jpeg lossless" - "loco" - and "ljpeg", they are not compatible at all.)

comment:3 by Michael Niedermayer, 12 years ago

Reproduced by developer: set
Resolution: fixed
Status: newclosed
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