[FFmpeg-user] can't capture from audio speakers, but well from microphone

[Phil Forneur]

OS: win10 64bits

I can't capture from audio speakers, but well from microphone.

Thanks

PS F:\> ffmpeg -list_devices true -f dshow -i dummy
ffmpeg version N-90271-g3386be16d5 Copyright (c) 2000-2018 the FFmpeg
developers
  built with gcc 7.3.0 (GCC)
  configuration: --enable-gpl --enable-version3 --enable-sdl2
--enable-bzlib --enable-fontconfig --enable-gnutls --enable-iconv
--enable-libass --enable-libbluray --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-libmfx
--enable-amf --enable-ffnvcodec --enable-cuvid --enable-d3d11va
--enable-nvenc --enable-nvdec --enable-dxva2 --enable-avisynth
  libavutil      56.  8.100 / 56.  8.100
  libavcodec     58. 14.100 / 58. 14.100
  libavformat    58. 10.100 / 58. 10.100
  libavdevice    58.  2.100 / 58.  2.100
  libavfilter     7. 12.100 /  7. 12.100
  libswscale      5.  0.102 /  5.  0.102
  libswresample   3.  0.101 /  3.  0.101
  libpostproc    55.  0.100 / 55.  0.100
[dshow @ 000002011a53a100] DirectShow video devices (some may be both video
and audio devices)
[dshow @ 000002011a53a100]  "TOSHIBA Web Camera - HD"
[dshow @ 000002011a53a100]     Alternative name
"@device_pnp_\\?\usb#vid_04f2&pid_b307&mi_00#7&366e0267&4&0000#{65e8773d-8f56-11d0-a3b9-00a0c9223196}\global"
[dshow @ 000002011a53a100] DirectShow audio devices
[dshow @ 000002011a53a100]  "Microphone (Realtek High Definition Audio)"
[dshow @ 000002011a53a100]     Alternative name
"@device_cm_{33D9A762-90C8-11D0-BD43-00A0C911CE86}\wave_{2749820B-9C1E-4D53-ADB0-44ACB7A34B4A}"
[dshow @ 000002011a53a100]  "Casque (JBL Soundgear Hands-Free)"
[dshow @ 000002011a53a100]     Alternative name
"@device_cm_{33D9A762-90C8-11D0-BD43-00A0C911CE86}\wave_{77C6E4D8-1CA7-4B5C-B3F9-F1343A65619C}"
dummy: Immediate exit requested
PS F:\>

PS F:\> ffprobe -devices
ffprobe version N-90271-g3386be16d5 Copyright (c) 2007-2018 the FFmpeg
developers
  built with gcc 7.3.0 (GCC)
  configuration: --enable-gpl --enable-version3 --enable-sdl2
--enable-bzlib --enable-fontconfig --enable-gnutls --enable-iconv
--enable-libass --enable-libbluray --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-libmfx
--enable-amf --enable-ffnvcodec --enable-cuvid --enable-d3d11va
--enable-nvenc --enable-nvdec --enable-dxva2 --enable-avisynth
  libavutil      56.  8.100 / 56.  8.100
  libavcodec     58. 14.100 / 58. 14.100
  libavformat    58. 10.100 / 58. 10.100
  libavdevice    58.  2.100 / 58.  2.100
  libavfilter     7. 12.100 /  7. 12.100
  libswscale      5.  0.102 /  5.  0.102
  libswresample   3.  0.101 /  3.  0.101
  libpostproc    55.  0.100 / 55.  0.100
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
PS F:\>