[FFmpeg-trac] #7848(undetermined:new): ffmpeg -devices doesn't show gdigrab as a device

[FFmpeg]

#7848: ffmpeg -devices doesn't show gdigrab as a device
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             Reporter:  dangibson     |                     Type:  defect
               Status:  new           |                 Priority:  normal
            Component:  undetermined  |                  Version:  4.1
             Keywords:                |               Blocked By:
             Blocking:                |  Reproduced by developer:  0
Analyzed by developer:  0             |
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 I've just started using ffmpeg and I think I've found an issue.

 Running 'ffmpeg -devices' shows:

 {{{
 ffmpeg version 4.1.1 Copyright (c) 2000-2019 the FFmpeg developers
   built with gcc 8.2.1 (GCC) 20190212
   configuration: --disable-static --enable-shared --enable-gpl --enable-
 version3 --enable-sdl2 --enable-fontconfig --enable-gnutls --enable-iconv
 --enable-libass --enable-libbl
 uray --enable-libfreetype --enable-libmp3lame --enable-libopencore-amrnb
 --enable-libopencore-amrwb --enable-libopenjpeg --enable-libopus --enable-
 libshine --enable-libsnappy -
 -enable-libsoxr --enable-libtheora --enable-libtwolame --enable-libvpx
 --enable-libwavpack --enable-libwebp --enable-libx264 --enable-libx265
 --enable-libxml2 --enable-libzimg
 --enable-lzma --enable-zlib --enable-gmp --enable-libvidstab --enable-
 libvorbis --enable-libvo-amrwbenc --enable-libmysofa --enable-libspeex
 --enable-libxvid --enable-libaom --
 enable-libmfx --enable-amf --enable-ffnvcodec --enable-cuvid --enable-
 d3d11va --enable-nvenc --enable-nvdec --enable-dxva2 --enable-avisynth
   libavutil      56. 22.100 / 56. 22.100
   libavcodec     58. 35.100 / 58. 35.100
   libavformat    58. 20.100 / 58. 20.100
   libavdevice    58.  5.100 / 58.  5.100
   libavfilter     7. 40.101 /  7. 40.101
   libswscale      5.  3.100 /  5.  3.100
   libswresample   3.  3.100 /  3.  3.100
   libpostproc    55.  3.100 / 55.  3.100
 Devices:
  D. = Demuxing supported
  .E = Muxing supported
  --
  D  dshow           DirectShow capture
  D  lavfi           Libavfilter virtual input device
   E sdl,sdl2        SDL2 output device
  D  vfwcap          VfW video capture
 }}}


 The manpage for devices says it should show gdigrab as a device, but it's
 not appearing.

 This also means that using av_input_video_device_next to enumerate the
 devices doesn't include gdigrab - I _think_ it should?

 In libavdevice/gdigrab.c, the gdigrab_class structure doesn't include a
 line:
         .category   = AV_CLASS_CATEGORY_DEVICE_VIDEO_INPUT,

 libavdevice/dshow.c does include that line.

 As a result, running ffmpeg -devices doesn't show gdigrab as a device.

--
Ticket URL: <https://trac.ffmpeg.org/ticket/7848>
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