Matrox MXO2 PCIe Host Adapter - Manual (Page 103)

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Defining your capture settings
4 The settings provided are similar to the genlock settings for playback (see
“Specifying your genlock settings for playback” on page 64 ), except the
settings apply only during capture.
Remarks
$
To avoid inaccurate In/Out points during batch capture, you must select an
external sync source.
$
If you want to genlock to your video input source, select Video Input .
5 Click OK to save your settings.