jpeg: wrong colors with rgb files

[ami_stuff]

subsampling is turned on

C:\>ffmpeg -i 2x1.jpg out.bmp
ffmpeg version N-66931-gbbd8c85 Copyright (c) 2000-2014 the FFmpeg developers
  built on Oct 17 2014 00:56:58 with gcc 4.9.1 (GCC)
  configuration: --enable-gpl --enable-version3 --disable-w32threads --enable-av
isynth --enable-bzlib --enable-fontconfig --enable-frei0r --enable-gnutls --enab
le-iconv --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --
enable-libfreetype --enable-libgme --enable-libgsm --enable-libilbc --enable-lib
modplug --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrw
b --enable-libopenjpeg --enable-libopus --enable-librtmp --enable-libschroedinge
r --enable-libsoxr --enable-libspeex --enable-libtheora --enable-libtwolame --en
able-libvidstab --enable-libvo-aacenc --enable-libvo-amrwbenc --enable-libvorbis
 --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx264 --enable-
libx265 --enable-libxavs --enable-libxvid --enable-zlib
  libavutil      54. 10.100 / 54. 10.100
  libavcodec     56.  8.100 / 56.  8.100
  libavformat    56.  9.100 / 56.  9.100
  libavdevice    56.  1.100 / 56.  1.100
  libavfilter     5.  1.106 /  5.  1.106
  libswscale      3.  1.101 /  3.  1.101
  libswresample   1.  1.100 /  1.  1.100
  libpostproc    53.  3.100 / 53.  3.100
Input #0, image2, from '2x1.jpg':
  Duration: 00:00:00.04, start: 0.000000, bitrate: 45913 kb/s
    Stream #0:0: Video: mjpeg, yuvj422p(pc, bt470bg/unknown/unknown), 1024x768,
25 tbr, 25 tbn, 25 tbc
File 'out.bmp' already exists. Overwrite ? [y/N] y
[swscaler @ 02f27020] deprecated pixel format used, make sure you did set range
correctly
Output #0, image2, to 'out.bmp':
  Metadata:
    encoder         : Lavf56.9.100
    Stream #0:0: Video: bmp, bgr24, 1024x768, q=2-31, 200 kb/s, 25 fps, 25 tbn,
25 tbc
    Metadata:
      encoder         : Lavc56.8.100 bmp
Stream mapping:
  Stream #0:0 -> #0:0 (mjpeg (native) -> bmp (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:2304kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing
overhead: unknown

C:\>ffmpeg -i 1x2.jpg out.bmp
ffmpeg version N-66931-gbbd8c85 Copyright (c) 2000-2014 the FFmpeg developers
  built on Oct 17 2014 00:56:58 with gcc 4.9.1 (GCC)
  configuration: --enable-gpl --enable-version3 --disable-w32threads --enable-av
isynth --enable-bzlib --enable-fontconfig --enable-frei0r --enable-gnutls --enab
le-iconv --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --
enable-libfreetype --enable-libgme --enable-libgsm --enable-libilbc --enable-lib
modplug --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrw
b --enable-libopenjpeg --enable-libopus --enable-librtmp --enable-libschroedinge
r --enable-libsoxr --enable-libspeex --enable-libtheora --enable-libtwolame --en
able-libvidstab --enable-libvo-aacenc --enable-libvo-amrwbenc --enable-libvorbis
 --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx264 --enable-
libx265 --enable-libxavs --enable-libxvid --enable-zlib
  libavutil      54. 10.100 / 54. 10.100
  libavcodec     56.  8.100 / 56.  8.100
  libavformat    56.  9.100 / 56.  9.100
  libavdevice    56.  1.100 / 56.  1.100
  libavfilter     5.  1.106 /  5.  1.106
  libswscale      3.  1.101 /  3.  1.101
  libswresample   1.  1.100 /  1.  1.100
  libpostproc    53.  3.100 / 53.  3.100
Input #0, image2, from '1x2.jpg':
  Duration: 00:00:00.04, start: 0.000000, bitrate: 45782 kb/s
    Stream #0:0: Video: mjpeg, yuvj440p(pc, bt470bg/unknown/unknown), 1024x768,
25 tbr, 25 tbn, 25 tbc
[swscaler @ 02f27dc0] deprecated pixel format used, make sure you did set range
correctly
Output #0, image2, to 'out.bmp':
  Metadata:
    encoder         : Lavf56.9.100
    Stream #0:0: Video: bmp, bgr24, 1024x768, q=2-31, 200 kb/s, 25 fps, 25 tbn,
25 tbc
    Metadata:
      encoder         : Lavc56.8.100 bmp
Stream mapping:
  Stream #0:0 -> #0:0 (mjpeg (native) -> bmp (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:2304kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing
overhead: unknown

[Michael Niedermayer]

Fixed in 4243415741e335b92feb757d5514a2cdfbb63cc4