Matrox MXO2 Installation And User Manual page 201

From the Video Input Format list, select the video format that matches the
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source video you want to stream. For a list of the video input formats
supported on the various MXO2 inputs, see
page 244.
From the Video Input Source list, select the type of video input you want
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to stream. For example, to stream video from your composite source, select
Composite . The available video input sources depend on your selected
video input format.
6 From the Audio Input Source list, select your audio source. For example, if
you want to stream channels 1 and 2 of your XLR (balanced analog) audio
input, select XLR Channel 1-2 . The available audio input sources depend on
your selected video input source. You can stream stereo audio only (two
input channels).
¦ Note When streaming HDMI embedded audio, only uncompressed
embedded audio is supported.
From the Video Frame Size list, select the frame size you want for your
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streaming video. If required, your source video will be scaled to your
selected frame size for use with your media encoding application.
From the Video Frame Rate list, select the frame rate that you want for
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your streaming video. The available frame rates depend on your selected
video input format. For example, if your source video's frame rate is 29.97,
you can select a frame rate of 14.98 or 29.97.
¡ Important To avoid having your media encoding application perform
additional scaling or frame rate conversions, make sure that the video frame
size and frame rate specified in your application match the frame size and
frame rate that you selected for your Matrox A/V settings.
Click OK to save your settings and return to your media encoding
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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.
If your application provides an audio input volume control, you can use it as
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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.
Specifying your Matrox A/V settings for media streaming
"Supported input formats"
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on