[FFmpeg-trac] #328(undetermined:open): PGM to JPEG-LS identify error

[FFmpeg]

#328: PGM to JPEG-LS identify error
------------------------+---------------------------
Reporter:  sebastian0   |       Owner:  michael
    Type:  defect       |      Status:  open
Priority:  normal       |   Component:  undetermined
 Version:  unspecified  |  Resolution:
Keywords:               |  Blocked By:
Blocking:               |  Reproduced:  0
Analyzed:  0            |
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Comment (by sebastian0):

 http://www.ffmpeg.org/releases/ffmpeg-snapshot.tar.bz2:
 ffmpeg version 0.7, Copyright (c) 2000-2011 the FFmpeg developers
   built on Jul  5 2011 09:51:41 with gcc 4.4.3

 Dunno. This is the git-HEAD-snapshot, right? O.o

 But, anyway, let's have a look on the hexdumps:

 $ most xxx.jls # created with ffmpeg from pgm
 0x00000000: FFD8FFF7 00110802 4002D003 01110002     ........ at .......
 0x00000010: 11000311 00FFDA00 0C030100 02000300     ................
 0x00000020: 00010001 E57FFF69 FF7FFF7F FF7FF4F9     .......i........
 0x00000030: 3FFF7FFF 7FFF7FEC FF7FFF7A 7FD3FF69     ?..........z...i
 0x00000040: E9FF7FFF 7FFF727F FF13E9FF 7FF4FE4F     ......r........O
 0x00000050: FF508601 000001EB 00003F9C F19FA70C     .P........?.....
 0x00000060: 6ED6AC95 535B377B 953BA8B8 ABC0401C     n...S[7{.;.... at .
 ...

 $ most xxx.jls # created by the university project JPEG-LS2FAST
 0x00000000: 4C530002 D0024000 FFFA8079 5FFFF4FF     LS.... at ....y_...
 0x00000010: FFFFFFFF FFD3E4FF FFFFFFFF FFFD9FFF     ................
 0x00000020: FFFD3FE9 FFE9E9FF FFFFFFFF 93FFF93E     ..?............>
 0x00000030: 9FFFFE9F C9FFF421 80400000 76002FCE     .......!. at ..v./.
 ...

 Do you see the "LS" at the beginning on the second hexdump?
 I think that's why the identify on the last one works, and on the ffmpeg
 one fails.

 So isn't this a bad behaviour?

-- 
Ticket URL: <https://ffmpeg.org/trac/ffmpeg/ticket/328#comment:6>
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