[FFmpeg-trac] #4116(avcodec:new): Support gray mjpeg encoding

[FFmpeg]

#4116: Support gray mjpeg encoding
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               Reporter:  cehoyos      |                  Owner:
                   Type:  enhancement  |                 Status:  new
               Priority:  wish         |              Component:  avcodec
                Version:  git-master   |               Keywords:  mjpeg
             Blocked By:               |               Blocking:
Reproduced by developer:  0            |  Analyzed by developer:  0
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 The mjpeg encoder does not support gray output:
 {{{
 $ ffmpeg -i gray.jpg out.jpg
 ffmpeg version N-67754-g30156ea Copyright (c) 2000-2014 the FFmpeg
 developers
   built on Nov 17 2014 11:54:23 with gcc 4.7 (SUSE Linux)
   configuration: --enable-gpl
   libavutil      54. 13.100 / 54. 13.100
   libavcodec     56. 12.101 / 56. 12.101
   libavformat    56. 13.100 / 56. 13.100
   libavdevice    56.  3.100 / 56.  3.100
   libavfilter     5.  2.103 /  5.  2.103
   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 'gray.jpg':
   Duration: 00:00:00.04, start: 0.000000, bitrate: 3674 kb/s
     Stream #0:0: Video: mjpeg, gray(bt470bg/unknown/unknown), 256x256 [SAR
 72:72 DAR 1:1], 25 tbr, 25 tbn, 25 tbc
 [swscaler @ 0x242b400] deprecated pixel format used, make sure you did set
 range correctly
 Output #0, image2, to 'out.jpg':
   Metadata:
     encoder         : Lavf56.13.100
     Stream #0:0: Video: mjpeg, yuvj444p(pc), 256x256 [SAR 1:1 DAR 1:1],
 q=2-31, 200 kb/s, 25 fps, 25 tbn, 25 tbc
     Metadata:
       encoder         : Lavc56.12.101 mjpeg
 Stream mapping:
   Stream #0:0 -> #0:0 (mjpeg (native) -> mjpeg (native))
 Press [q] to stop, [?] for help
 frame=    1 fps=0.0 q=4.1 Lsize=N/A time=00:00:00.04 bitrate=N/A
 video:12kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB
 muxing overhead: unknown
 }}}

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Ticket URL: <https://trac.ffmpeg.org/ticket/4116>
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