Virtual audio capture doesn't work with Microsoft Expression SDK

[tomason16]

Hi,

First, I would like to thank you for this development, it's great!
I'm trying to record by using the virtual audio capture device as the audio device in Microsoft expression SDK.

The code:
var audioDevices = EncoderDevices.FindDevices(EncoderDeviceType.Audio);
for (var deviceCount = 0; deviceCount < audioDevices.Count; deviceCount++)
{
try
{
if (audioDevices[deviceCount].Name == "virtual-audio-capturer")
{
_job.AddAudioDeviceSource(audioDevices[deviceCount]);
}
}
catch (Exception)
{
}
}

_job is actually a ScreenCaptureJob which is documented by Microsoft.

All other audio devices can be added by that method. Only when adding the virtual audio capture device, it throws an error -
{"Fail to set device to audio device source."} System.Exception {Microsoft.Expression.Encoder.ArgumentErrorException}

When using ffmpeg to try and record audio from the virtual device, it doesn't report any issues, so therefore it seems that it's installed properly (i just registered the relevant dll).

Microsoft expression SDK seems to actually recognise it, as it's in the list of devices, but throws the error above.

Please assist.

Thank you!

[rdp]

I wonder if it's rejecting its format type, what does the output of ffmpeg
-f dshow -show_options 1 -i audio=virtual-audio-capturer
give?

On Mon, Sep 21, 2015 at 11:37 AM, tomason16 notifications@github.com
wrote:

Hi,

First, I would like to thank you for this development, it's great!
I'm trying to record by using the virtual audio capture device as the
audio device in Microsoft expression SDK.

The code:
var audioDevices = EncoderDevices.FindDevices(EncoderDeviceType.Audio);
for (var deviceCount = 0; deviceCount < audioDevices.Count; deviceCount++)
{
try
{
if (audioDevices[deviceCount].Name == "virtual-audio-capturer")
{
_job.AddAudioDeviceSource(audioDevices[deviceCount]);
}
}
catch (Exception)
{
}
}

_job is actually a ScreenCaptureJob which is documented by Microsoft.

All other audio devices can be added by that method. Only when adding the
virtual audio capture device, it throws an error -
{"Fail to set device to audio device source."} System.Exception
{Microsoft.Expression.Encoder.ArgumentErrorException}

When using ffmpeg to try and record audio from the virtual device, it
doesn't report any issues, so therefore it seems that it's installed
properly (i just registered the relevant dll).

Microsoft expression SDK seems to actually recognise it, as it's in the
list of devices, but throws the error above.

Please assist.

Thank you!

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#16.

[tomason16]

Thank you for the quick reply. It throws this error:
Unrecognized option 'show_options'.
Error splitting the argument list: Option not found

[rdp]

oops try list_options instead of show_options

[tomason16]

The output of the command is:
ffmpeg version N-53033-g56ba331 Copyright (c) 2000-2013 the FFmpeg developers
built on May 13 2013 22:18:29 with gcc 4.7.3 (GCC)
configuration: --enable-gpl --enable-version3 --disable-w32threads --enable-avisynth --enable-bzlib --enable-fontconfig --
tls --enable-iconv --enable-libass --enable-libbluray --enable-libcaca --enable-libfreetype --enable-libgsm --enable-libilbc
ble-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-libopus --enable-librtmp --enable-libschroedi
able-libspeex --enable-libtheora --enable-libtwolame --enable-libvo-aacenc --enable-libvo-amrwbenc --enable-libvorbis --enab
--enable-libxavs --enable-libxvid --enable-zlib
libavutil 52. 31.100 / 52. 31.100
libavcodec 55. 9.100 / 55. 9.100
libavformat 55. 7.100 / 55. 7.100
libavdevice 55. 0.100 / 55. 0.100
libavfilter 3. 65.100 / 3. 65.100
libswscale 2. 3.100 / 2. 3.100
libswresample 0. 17.102 / 0. 17.102
libpostproc 52. 3.100 / 52. 3.100
[dshow @ 0036a760] DirectShow audio device options
[dshow @ 0036a760] Pin "Capture Pin"
[dshow @ 0036a760] min ch=2 bits=16 rate= 44100 max ch=2 bits=16 rate= 44100

[rdp]

dang I was hoping it would be something besides 44100. Unfortunately I'm
not sure...I think I've had it with with flash media live encoder before
[?] so it worked there but not this microsoft thing? weird.

On Wed, Sep 23, 2015 at 12:49 PM, tomason16 notifications@github.com
wrote:

The output of the command is:
ffmpeg version N-53033-g56ba331 Copyright (c) 2000-2013 the FFmpeg
developers
built on May 13 2013 22:18:29 with gcc 4.7.3 (GCC)
configuration: --enable-gpl --enable-version3 --disable-w32threads
--enable-avisynth --enable-bzlib --enable-fontconfig --
tls --enable-iconv --enable-libass --enable-libbluray --enable-libcaca
--enable-libfreetype --enable-libgsm --enable-libilbc
ble-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg
--enable-libopus --enable-librtmp --enable-libschroedi
able-libspeex --enable-libtheora --enable-libtwolame --enable-libvo-aacenc
--enable-libvo-amrwbenc --enable-libvorbis --enab
--enable-libxavs --enable-libxvid --enable-zlib
libavutil 52. 31.100 / 52. 31.100
libavcodec 55. 9.100 / 55. 9.100
libavformat 55. 7.100 / 55. 7.100
libavdevice 55. 0.100 / 55. 0.100
libavfilter 3. 65.100 / 3. 65.100
libswscale 2. 3.100 / 2. 3.100
libswresample 0. 17.102 / 0. 17.102
libpostproc 52. 3.100 / 52. 3.100
[dshow @ 0036a760] DirectShow audio device options
[dshow @ 0036a760] Pin "Capture Pin"
[dshow @ 0036a760] min ch=2 bits=16 rate= 44100 max ch=2 bits=16 rate=
44100

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#16 (comment)
.

[tomason16]

Yes.
Thank you. If you'll have any idea on how to debug this or get any more idea regarding the issue please let me know.
Many thanks!