maybe this code should be modified in libavcodec/tiff.c to support properly 2/4bpp grayscales:
/* make default grayscale pal */
pal = (uint32_t *) s->picture.data[1];
for (i = 0; i < 256; i++)
pal[i] = i * 0x010101;
C:\>ffmpeg -i C:\TIFF_2bpp_grayscale.mov
ffmpeg version N-32077-g5f5e37e, Copyright (c) 2000-2011 the FFmpeg developers
built on Aug 24 2011 02:29:36 with gcc 4.5.0 20100414 (Fedora MinGW 4.5.0-1.fc
14)
configuration: --prefix=/var/www/users/research/ffmpeg/snapshots/build --arch=
x86 --target-os=mingw32 --cross-prefix=i686-pc-mingw32- --cc='ccache i686-pc-min
gw32-gcc' --enable-w32threads --enable-memalign-hack --enable-runtime-cpudetect
--enable-cross-compile --enable-static --disable-shared --extra-libs='-lws2_32 -
lwinmm' --extra-cflags='--static -I/var/www/users/research/ffmpeg/snapshots/buil
d/include' --extra-ldflags='-static -L/var/www/users/research/ffmpeg/snapshots/b
uild/lib' --enable-bzlib --enable-zlib --enable-gpl --enable-version3 --enable-n
onfree --enable-libx264 --enable-libspeex --enable-libtheora --enable-libvorbis
--enable-libfaac --enable-libxvid --enable-libopencore-amrnb --enable-libopencor
e-amrwb --enable-libmp3lame --enable-libvpx --disable-decoder=libvpx
libavutil 51. 13. 0 / 51. 13. 0
libavcodec 53. 12. 0 / 53. 12. 0
libavformat 53. 9. 0 / 53. 9. 0
libavdevice 53. 3. 0 / 53. 3. 0
libavfilter 2. 34. 2 / 2. 34. 2
libswscale 2. 0. 0 / 2. 0. 0
libpostproc 51. 2. 0 / 51. 2. 0
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'C:\TIFF_2bpp_grayscale.mov':
Metadata:
major_brand : qt
minor_version : 537199360
compatible_brands: qt
creation_time : 2011-08-24 18:55:16
Duration: 00:00:00.33, start: 0.000000, bitrate: 9279 kb/s
Stream #0.0(eng): Video: tiff (tiff / 0x66666974), pal8, 640x480, 9258 kb/s,
15 fps, 15 tbr, 15 tbn, 15 tbc
Metadata:
creation_time : 2011-08-24 18:55:16
At least one output file must be specified
C:\>ffmpeg -i C:\TIFF_4bpp_grayscale.mov
ffmpeg version N-32077-g5f5e37e, Copyright (c) 2000-2011 the FFmpeg developers
built on Aug 24 2011 02:29:36 with gcc 4.5.0 20100414 (Fedora MinGW 4.5.0-1.fc
14)
configuration: --prefix=/var/www/users/research/ffmpeg/snapshots/build --arch=
x86 --target-os=mingw32 --cross-prefix=i686-pc-mingw32- --cc='ccache i686-pc-min
gw32-gcc' --enable-w32threads --enable-memalign-hack --enable-runtime-cpudetect
--enable-cross-compile --enable-static --disable-shared --extra-libs='-lws2_32 -
lwinmm' --extra-cflags='--static -I/var/www/users/research/ffmpeg/snapshots/buil
d/include' --extra-ldflags='-static -L/var/www/users/research/ffmpeg/snapshots/b
uild/lib' --enable-bzlib --enable-zlib --enable-gpl --enable-version3 --enable-n
onfree --enable-libx264 --enable-libspeex --enable-libtheora --enable-libvorbis
--enable-libfaac --enable-libxvid --enable-libopencore-amrnb --enable-libopencor
e-amrwb --enable-libmp3lame --enable-libvpx --disable-decoder=libvpx
libavutil 51. 13. 0 / 51. 13. 0
libavcodec 53. 12. 0 / 53. 12. 0
libavformat 53. 9. 0 / 53. 9. 0
libavdevice 53. 3. 0 / 53. 3. 0
libavfilter 2. 34. 2 / 2. 34. 2
libswscale 2. 0. 0 / 2. 0. 0
libpostproc 51. 2. 0 / 51. 2. 0
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'C:\TIFF_4bpp_grayscale.mov':
Metadata:
major_brand : qt
minor_version : 537199360
compatible_brands: qt
creation_time : 2011-08-24 18:57:01
Duration: 00:00:00.33, start: 0.000000, bitrate: 18504 kb/s
Stream #0.0(eng): Video: tiff (tiff / 0x66666974), pal8, 640x480, 18484 kb/s
, 15 fps, 15 tbr, 15 tbn, 15 tbc
Metadata:
creation_time : 2011-08-24 18:57:01
At least one output file must be specified
