ljpeg: fix losslesss prediction 0 for 24bpp (and 48bpp)

[ami_stuff]

$ ffmpeg -i 24_pred0.jpg out2.bmp
ffmpeg version 0.9.0.git-12d8340 Copyright (c) 2000-2012 the FFmpeg developers
  built on Jan  7 2012 02:04:56 with gcc 4.5.2
  configuration: --disable-ffplay --disable-ffserver --disable-ffprobe --disable
-asm --disable-yasm --disable-shared --enable-static
  libavutil      51. 34.100 / 51. 34.100
  libavcodec     53. 54.100 / 53. 54.100
  libavformat    53. 29.100 / 53. 29.100
  libavdevice    53.  4.100 / 53.  4.100
  libavfilter     2. 57.101 /  2. 57.101
  libswscale      2.  1.100 /  2.  1.100
  libswresample   0.  5.100 /  0.  5.100
Input #0, image2, from '24_pred0.jpg':
  Duration: 00:00:00.04, start: 0.000000, bitrate: N/A
    Stream #0:0: Video: mjpeg, bgr24, 640x480, 25 tbr, 25 tbn, 25 tbc
[buffer @ 016c1940] w:640 h:480 pixfmt:bgr24 tb:1/1000000 sar:0/1 sws_param:
Output #0, image2, to 'out2.bmp':
  Metadata:
    encoder         : Lavf53.29.100
    Stream #0:0: Video: bmp, bgr24, 640x480, 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:900kB audio:0kB global headers:0kB muxing overhead -100.000000%

[cehoyos]

There is an ugly vertical line at the left side of the images.

[michael]

Fix on ML

[cehoyos]

Could you clarify if 48_pred0.jpg really is 48bit?
Is there an application that can be used to show?

[ami_stuff]

Replying to cehoyos:

Could you clarify if 48_pred0.jpg really is 48bit?

afaict, yes. when you use PIX_FMT_BGR48LE then only a half of the output will be filled with image, so probably some code needs to be added to ljpeg decoder to correctly support it.

Is there an application that can be used to show?

 http://www.myviewpad.com/index.php