AJA IoExpress User Manual

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Io Express Installation and Operation Guide — Using the AJA Control Panel

Io Express Control Panel, Timecode Pulldown Menu

Use QuickTime Timecode—when checked, this directs Io Express to output timecode from the

QuickTime timecode track in playback. When not checked, Io Express uses the Output
Timecode Offset value plus the number of frames into the movie. Note: not all QuickTime
applications use or support timecode tracks—so sometimes the QuickTime timecode is
missing or not meaningful.

Output Timecode Offset (entry field and FPS pull-down)—this text entry field allows you to

specify a timecode offset for use with any other application that has timecode offsets that
are user-controlled. Use that same value here as the “Output Timecode Offset” to ensure
the timecode is synchronized.

Timecode Burn-in—this pulldown selects whether the timecode value is “burned-in” on video

output from Io Express. If set to “OFF”, timecode will not be keyed over the video. If set to
“timecode”, then the timecode value will be keyed over the output video. This can be useful
for synchronizing, choosing edit points, dailies, and many other purposes.

Note: SMPTE RP 188 defines a standard for the transmission of time code and control code in

the ancillary data space of a digital television data stream. Time code information is
transmitted in the ancillary data space as defined in ANSI/SMPTE 291M. Multiple codes can
be transmitted within a single digital video data stream. Other time information, such as
real time clock, DTTR tape timer information, and other user-defined information, may also
be carried in the ancillary time code packet instead of time code. The actual information
transmitted through the interface is identified by the coding of a distributed binary bit.
Equipment manufacturers can use the meta data for different purposes.