[FFmpeg-user] Using ffmpeg to stream to or from Blackmagic Decklink Card

[davood afshari]

Hello,
I want to use blackmagic cards with ffmpeg to stream their input but there
is a problem.
When I use "H264 Pro" Encoder as a "decklink" or "dshow" input, I see this
error in command line output of ffmpeg. Device is ok and I can Use it with
other applications like MXPTiny or MXLight.
Here is the command and output:
*>ffmpeg -f dshow -list_devices true -i dummy*
ffmpeg version 3.0.1 Copyright (c) 2000-2016 the FFmpeg developers
  built with gcc 5.3.0 (GCC)
  configuration: --enable-gpl --enable-version3 --disable-w32threads
--enable-avisynth --enable-bzlib --enable-fontconfig --enable-frei0r
--enable-gnutls --enable-iconv --enable-libass --enable-libbluray
--enable-libbs2b --enable-libcaca --enable-libdcadec --enable-libfreetype
--enable-libgme --enable-libgsm --enable-libilbc --enable-libmodplug
--enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb
--enable-libopenjpeg --enable-libopus --enable-librtmp
--enable-libschroedinger --enable-libsoxr --enable-libspeex
--enable-libtheora --enable-libtwolame --enable-libvidstab
--enable-libvo-amrwbenc --enable-libvorbis --enable-libvpx
--enable-libwavpack --enable-libwebp --enable-libx264 --enable-libx265
--enable-libxavs --enable-libxvid --enable-libzimg --enable-lzma
--enable-decklink --enable-zlib
  libavutil      55. 17.103 / 55. 17.103
  libavcodec     57. 24.102 / 57. 24.102
  libavformat    57. 25.100 / 57. 25.100
  libavdevice    57.  0.101 / 57.  0.101
  libavfilter     6. 31.100 /  6. 31.100
  libswscale      4.  0.100 /  4.  0.100
  libswresample   2.  0.101 /  2.  0.101
  libpostproc    54.  0.100 / 54.  0.100
[dshow @ 0000005f5272ad40] DirectShow video devices (some may be both video
and audio devices)
[dshow @ 0000005f5272ad40]  "Decklink Video Capture"
[dshow @ 0000005f5272ad40]     Alternative name
"@device_sw_{860BB310-5D01-11D0-BD3B-00A0C911CE86}\{44A8B5C7-13B6-4211-BD40-35B629D9E6DF}"
[dshow @ 0000005f5272ad40]  "screen-capture-recorder"
[dshow @ 0000005f5272ad40]     Alternative name
"@device_sw_{860BB310-5D01-11D0-BD3B-00A0C911CE86}\{4EA69364-2C8A-4AE6-A561-56E4B5044439}"
[dshow @ 0000005f5272ad40] DirectShow audio devices
[dshow @ 0000005f5272ad40]  "Microphone (High Definition Audio Device)"
[dshow @ 0000005f5272ad40]     Alternative name
"@device_cm_{33D9A762-90C8-11D0-BD43-00A0C911CE86}\wave_{CBA42E33-151B-4975-B9A5-68B2552152F4}"
[dshow @ 0000005f5272ad40]  "virtual-audio-capturer"
[dshow @ 0000005f5272ad40]     Alternative name
"@device_sw_{33D9A762-90C8-11D0-BD43-00A0C911CE86}\{8E146464-DB61-4309-AFA1-3578E927E935}"
[dshow @ 0000005f5272ad40]  "Decklink Audio Capture"
[dshow @ 0000005f5272ad40]     Alternative name
"@device_sw_{33D9A762-90C8-11D0-BD43-00A0C911CE86}\{AAA22F7E-5AA0-49D9-8C8D-B52B1AA92EB7}"
dummy: Immediate exit requested


and when I use "Decklink Video Capture" to identify its options, here is
the output:
*>ffmpeg -f dshow -list_options true -i video="Decklink Video Capture"*
ffmpeg version 3.0.1 Copyright (c) 2000-2016 the FFmpeg developers
  built with gcc 5.3.0 (GCC)
  configuration: --enable-gpl --enable-version3 --disable-w32threads
--enable-avisynth --enable-bzlib --enable-fontconfig --enable-frei0r
--enable-gnutls --enable-iconv --enable-libass --enable-libbluray
--enable-libbs2b --enable-libcaca --enable-libdcadec --enable-libfreetype
--enable-libgme --enable-libgsm --enable-libilbc --enable-libmodplug
--enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb
--enable-libopenjpeg --enable-libopus --enable-librtmp
--enable-libschroedinger --enable-libsoxr --enable-libspeex
--enable-libtheora --enable-libtwolame --enable-libvidstab
--enable-libvo-amrwbenc --enable-libvorbis --enable-libvpx
--enable-libwavpack --enable-libwebp --enable-libx264 --enable-libx265
--enable-libxavs --enable-libxvid --enable-libzimg --enable-lzma
--enable-decklink --enable-zlib
  libavutil      55. 17.103 / 55. 17.103
  libavcodec     57. 24.102 / 57. 24.102
  libavformat    57. 25.100 / 57. 25.100
  libavdevice    57.  0.101 / 57.  0.101
  libavfilter     6. 31.100 /  6. 31.100
  libswscale      4.  0.100 /  4.  0.100
  libswresample   2.  0.101 /  2.  0.101
  libpostproc    54.  0.100 / 54.  0.100
[dshow @ 00000036677bad40] Unable to BindToObject for Decklink Video Capture
[dshow @ 00000036677bad40] Could not find video device with name [Decklink
Video Capture] among source devices of type video.
video=Decklink Video Capture: I/O error


It's the same when I use "Decklink Audio Capture" to identify its options.
I have a H264 Pro blackmagic device witch attached with usb port to my PC.
I've tested this card and it worked with other softwares such as blackmagic
audio video ot mxlight or mxptiny.
Thanks