Matrox MXO2 PCIe Host Adapter - Manual (Page 236)

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Chapter 14, Using MXO2 with Adobe and Microsoft Live Media Encoders
size and frame rate specified in your application match the frame size and
frame rate that you selected for your Matrox A/V settings.
9 Click OK to save your settings and return to your media encoding
application. You should see your selected video source play back in your
application’s live preview window. If you don’t see your source video, check
that your Matrox MXO2 hardware and selected video source are properly
connected.
10 If you want to stream audio only, clear the option to enable video encoding
in your application.
11 If your application provides an audio input volume control, you can use it as
needed to adjust the volume of the incoming audio for streaming.
For details on how to specify additional encoding settings and stream your live
video and audio, refer to the documentation for your streaming media encoding
application.