Sync and Video : Working with Video in Pro Tools : Using the Video Window : Changing Video Window Options

Changing Video Window Options
The Video window pop-up menu lets you do the following:
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Toggle output of QuickTime video between the Video window and an external monitor using the FireWire port (without an Avid Video peripheral this is supported with Mac only) or PCIe (with a qualified video card).
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To toggle the online status of the main video track:
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Right-click (Windows or Mac) or Control-click (Mac) the Video window, and select Online.
 
To toggle output of QuickTime video between the Video window and FireWire, do one of the following (Mac only):
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Select (or deselect) Options > Video Out FireWire.
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Right-click, or Control-click, the Video window, and select (or deselect) Video Out FireWire.
To toggle output of QuickTime video between the Video window and PCIe, do one of the following (Mac only):
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Select (or deselect) Options > Video Out PCIe.
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Right-click, or Control-click, the Video window, and select (or deselect) Video Out PCIe