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T-TAP Installation and Operation Guide — Control Panel Operation
Timecode Screen
The timecode is used for both monitoring the RP-188 timecode embedded in the digital data
stream and for selecting a timecode offset (if required) for the attached VTR—and sent during
assemble-edit mode.
Note:
SMPTE 12M-2 is the updated name and specification for what was RP-188.
AJA Control Panel, Timecode Screen
Timecode Screen Settings
Use QuickTime Timecode
—when checked, this directs T-TAP to output timecode from the
QuickTime timecode track. When not checked, T-TAP 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 your editing application that supports user-
controlled timecode offsets. 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 T-TAP. 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.
