pal8 output is gray / empty

[ami_stuff]

C:\>ffmpeg -i test.bmp -pix_fmt pal8 pal8.tif
ffmpeg version N-35966-g1d0ae92, Copyright (c) 2000-2011 the FFmpeg developers
  built on Dec 19 2011 13:01:15 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. 32. 0 / 51. 32. 0
  libavcodec   53. 46. 1 / 53. 46. 1
  libavformat  53. 27. 0 / 53. 27. 0
  libavdevice  53.  4. 0 / 53.  4. 0
  libavfilter   2. 53. 0 /  2. 53. 0
  libswscale    2.  1. 0 /  2.  1. 0
  libpostproc  51.  2. 0 / 51.  2. 0
Input #0, image2, from 'test.bmp':
  Duration: 00:00:00.04, start: 0.000000, bitrate: N/A
    Stream #0:0: Video: bmp, bgr24, 1024x768, 25 tbr, 25 tbn, 25 tbc
[buffer @ 020E1480] w:1024 h:768 pixfmt:bgr24 tb:1/1000000 sar:0/1 sws_param:
[buffersink @ 020E1700] auto-inserting filter 'auto-inserted scale 0' between th
e filter 'src' and the filter 'out'
[scale @ 020E1B40] w:1024 h:768 fmt:bgr24 -> w:1024 h:768 fmt:pal8 flags:0x4
Output #0, image2, to 'pal8.tif':
  Metadata:
    encoder         : Lavf53.27.0
    Stream #0:0: Video: tiff, pal8, 1024x768, q=2-31, 200 kb/s, 90k tbn, 25 tbc
Stream mapping:
  Stream #0:0 -> #0:0 (bmp -> tiff)
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:759kB audio:0kB global headers:0kB muxing overhead -100.000000%

with some old ffmpeg build I get this:

C:\>ffmpeg -i test.bmp -pix_fmt pal8 pal8.tif
FFmpeg version SVN-r18316, Copyright (c) 2000-2009 Fabrice Bellard, et al.
  configuration: --enable-memalign-hack --prefix=/mingw --cross-prefix=i686-ming
w32- --cc=ccache-i686-mingw32-gcc --target-os=mingw32 --arch=i686 --cpu=i686 --e
xtra-cflags=-fno-common --enable-avisynth --enable-gpl --enable-zlib --enable-bz
lib --enable-libgsm --enable-libfaac --enable-pthreads --enable-libvorbis --enab
le-libmp3lame --enable-libopenjpeg --enable-libtheora --enable-libspeex --enable
-libxvid --enable-libfaad --enable-libschroedinger --enable-libx264
  libavutil     50. 2. 0 / 50. 2. 0
  libavcodec    52.22. 3 / 52.22. 3
  libavformat   52.32. 0 / 52.32. 0
  libavdevice   52. 1. 0 / 52. 1. 0
  libswscale     0. 7. 1 /  0. 7. 1
  built on Apr  2 2009 16:33:19, gcc: 4.2.4
Input #0, image2, from 'test.bmp':
  Duration: 00:00:00.04, start: 0.000000, bitrate: N/A
    Stream #0.0: Video: bmp, bgr24, 1024x768, 25 tbr, 25 tbn, 25 tbc
swScaler: Palette is not supported as output pixel format
Cannot get resampling context

[ami_stuff]

regression between N-35295-gb55dd10 and N-35462-g61b1d85

C:\>ffmpeg.exe -i test.bmp -pix_fmt pal8 iiii.tif
ffmpeg version N-35295-gb55dd10, Copyright (c) 2000-2011 the FFmpeg developers
  built on Nov 30 2011 00:52:52 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. 29. 1 / 51. 29. 1
  libavcodec   53. 39. 1 / 53. 39. 1
  libavformat  53. 22. 0 / 53. 22. 0
  libavdevice  53.  4. 0 / 53.  4. 0
  libavfilter   2. 50. 0 /  2. 50. 0
  libswscale    2.  1. 0 /  2.  1. 0
  libpostproc  51.  2. 0 / 51.  2. 0
Input #0, image2, from 'test.bmp':
  Duration: 00:00:00.04, start: 0.000000, bitrate: N/A
    Stream #0:0: Video: bmp, bgr24, 1024x768, 25 tbr, 25 tbn, 25 tbc
[buffer @ 020C1A00] w:1024 h:768 pixfmt:bgr24 tb:1/1000000 sar:0/1 sws_param:
[buffersink @ 020C1C80] auto-inserting filter 'auto-inserted scale 0' between th
e filter 'src' and the filter 'out'
Impossible to convert between the formats supported by the filter 'auto-inserted
 scale 0' and the filter 'out'
Error opening filters!

C:\>ffmpeg.exe -i test.bmp -pix_fmt pal8 iiii.tif
ffmpeg version N-35462-g61b1d85, Copyright (c) 2000-2011 the FFmpeg developers
  built on Dec  5 2011 14:22:27 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. 30. 0 / 51. 30. 0
  libavcodec   53. 40. 0 / 53. 40. 0
  libavformat  53. 24. 0 / 53. 24. 0
  libavdevice  53.  4. 0 / 53.  4. 0
  libavfilter   2. 51. 0 /  2. 51. 0
  libswscale    2.  1. 0 /  2.  1. 0
  libpostproc  51.  2. 0 / 51.  2. 0
Input #0, image2, from 'test.bmp':
  Duration: 00:00:00.04, start: 0.000000, bitrate: N/A
    Stream #0:0: Video: bmp, bgr24, 1024x768, 25 tbr, 25 tbn, 25 tbc
[buffer @ 020C1480] w:1024 h:768 pixfmt:bgr24 tb:1/1000000 sar:0/1 sws_param:
[buffersink @ 020C1700] auto-inserting filter 'auto-inserted scale 0' between th
e filter 'src' and the filter 'out'
[scale @ 020C1B40] w:1024 h:768 fmt:bgr24 -> w:1024 h:768 fmt:pal8 flags:0x4
Output #0, image2, to 'iiii.tif':
  Metadata:
    encoder         : Lavf53.24.0
    Stream #0:0: Video: tiff, pal8, 1024x768, q=2-31, 200 kb/s, 90k tbn, 25 tbc
Stream mapping:
  Stream #0:0 -> #0:0 (bmp -> tiff)
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:759kB audio:0kB global headers:0kB muxing overhead -100.000000%

[cehoyos]

A filter was posted some time ago:
 http://thread.gmane.org/gmane.comp.video.ffmpeg.devel/101397/focus=101443

[cehoyos]

Fixed by Reimar.