[FFmpeg-trac] #4687(avcodec:new): Support grayscale tif images with less than eight bits

[FFmpeg]

#4687: Support grayscale tif images with less than eight bits
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               Reporter:  cehoyos      |                  Owner:
                   Type:  enhancement  |                 Status:  new
               Priority:  wish         |              Component:  avcodec
                Version:  git-master   |               Keywords:  tif
             Blocked By:               |               Blocking:
Reproduced by developer:  0            |  Analyzed by developer:  0
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 As reported by ami_stuff in ticket #3459:
 Tiff images with less than eight bit per component are not supported by
 current FFmpeg.
 {{{
 $ ffmpeg -i 7bpp_raw.tif
 ffmpeg version N-73264-gb54ac84 Copyright (c) 2000-2015 the FFmpeg
 developers
   built with gcc 4.7 (SUSE Linux)
   configuration: --enable-gpl
   libavutil      54. 27.100 / 54. 27.100
   libavcodec     56. 45.101 / 56. 45.101
   libavformat    56. 40.100 / 56. 40.100
   libavdevice    56.  4.100 / 56.  4.100
   libavfilter     5. 19.100 /  5. 19.100
   libswscale      3.  1.101 /  3.  1.101
   libswresample   1.  2.100 /  1.  2.100
   libpostproc    53.  3.100 / 53.  3.100
 [tiff @ 0x26d22c0] This format is not supported (bpp=7, bppcount=1)
 [tiff_pipe @ 0x26d13e0] decoding for stream 0 failed
 [tiff_pipe @ 0x26d13e0] Could not find codec parameters for stream 0
 (Video: tiff, none): unspecified size
 Consider increasing the value for the 'analyzeduration' and 'probesize'
 options
 7bpp_raw.tif: could not find codec parameters
 Input #0, tiff_pipe, from '7bpp_raw.tif':
   Duration: N/A, bitrate: N/A
     Stream #0:0: Video: tiff, none, 25 tbr, 25 tbn, 25 tbc
 At least one output file must be specified
 }}}

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Ticket URL: <https://trac.ffmpeg.org/ticket/4687>
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