AJA io XT, Installation And Operation Manual, Page: 47 / 66

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Io XT Installation and Operation Manual — Control Panel Operation
Timecode Screen Settings
RP-188 Timecode <n>—in RP-188 timecode (SMPTE 12M-2) there can be multiple
timecode values in the data stream. Use this pull-down to select the one you wish
to monitor. The selection will be displayed in the timecode value displayed to the
right of the pull-down.
User Bits—For monitoring variable framerate (VFR) timecode (such as Varicam), you
may wish to monitor the user bits embedded in the timecode. If you set this
checkbox, Io XT will detect and interpret the user bits and display them next to the
checkbox.
Use QuickTime Timecode—when checked, this directs Io XT to output timecode from
the QuickTime timecode track. When not checked, Io XT 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 Final Cut Pro 7 (or any other
application that has timecode offsets that are user-controlled). In FCP, go to
“Timeline Options” and locate the “Starting Timecode” value. 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 XT.
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.