AJA IOExpress, Installation And Operation Manual, Page: 51 / 68

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Io Express Installation and Operation Guide — Using the AJA Control Panel
Who is Controlling
Io Express?
There are times when you might have several Quicktime applications open at one time, and
each of these might want to output their video thru the Io Express video output. Io Express is
very flexible and most applications perform the necessary housekeeping so they work correctly
when they're active and when they're not. This means that the application that is “active” (in
front) will be granted control of the Io Express video output. Generally, when you switch to a
different application, the previous application lets go of the video output and the new
application gets control.
Io Express/AJA Control Panel “In Use” Message
The AJA Control Panel in-use message will tell you the “active” application that has control of
Io Express (see in-use message above) and what the format selections are. If you click on another
supported application that is running such as Adobe Premiere Pro or AJA TV, the AJA Control
Panel in-use message will report the change by displaying the new application in control. If no
in-use message is displayed, the AJA Control Panel is in control of Io Express. If no QuickTime
applications are running, the board’s state is determined by the AJA Control Panel’s settings.
QuickTime Application Format Selection
If a running QuickTime application uses Io Express for capture or output, it controls the Primary
format via its own menus and settings. For example, when the Third-party editing application is
active (it’s the front-most application) and has Io Express as its “A/V Device”, Io Express's Primary
format is determined by the application’s “Video Playback” settings. These format selections are
reported in the AJA Control Panel block diagram.
Note: QuickTime applications can start and stop and change modes—even while they are
running. And the behavior of different QuickTime applications can vary: some applications
take control of the interface as soon as they are launched and don't give it up until they
quit, while other applications take control of the interface only when they are the “front-
most” running application and then relinquish control when they’re not. Even these
QuickTime applications may not relinquish control until capture or output operations are
completed.
Control Recommendations
We recommend you have the Control Panel running and visible at all times. When the Control
Panel is running in the background (not front-most) you can see what the interface is doing and
who has control of it.
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