ffplay -f dshow -pixel_format bgr0 -framerate 59.94 -video_size 1280x720 -i video="Blackmagic WDM Capture":audio="Blackmagic WDM Capture"

ffplay version N-90991-g0736f32a4f Copyright (c) 2003-2018 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-libaom --enable-libmfx --enable-amf --enable-ffnvcodec --enable-cuvid --enable-d3d11va --enable-nvenc --enable-nvdec --enable-dxva2 --enable-avisynth
  libavutil      56. 18.100 / 56. 18.100
  libavcodec     58. 19.101 / 58. 19.101
  libavformat    58. 13.101 / 58. 13.101
  libavdevice    58.  4.100 / 58.  4.100
  libavfilter     7. 21.100 /  7. 21.100
  libswscale      5.  2.100 /  5.  2.100
  libswresample   3.  2.100 /  3.  2.100
  libpostproc    55.  2.100 / 55.  2.100
[dshow @ 000001bbefc708c0] Could not find audio only device with name [Blackmagic WDM Capture] among source devices of type audio.
[dshow @ 000001bbefc708c0] Searching for audio device within video devices for Blackmagic WDM Capture
Input #0, dshow, from 'video=Blackmagic WDM Capture:audio=Blackmagic WDM Capture':
  Duration: N/A, start: 0.010000, bitrate: 1536 kb/s
    Stream #0:0: Video: rawvideo, bgr0, 1280x720, 59.94 fps, 59.94 tbr, 10000k tbn, 10000k tbc
    Stream #0:1: Audio: pcm_s16le, 48000 Hz, 2 channels, s16, 1536 kb/s
  90.50 A-V: -0.031 fd=   6 aq=    0KB vq= 3600KB sq=    0B f=0/0