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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
Express will detect and interpret the user bits and display them next to the checkbox.
Io Express Control Panel, Timecode Tab, User Bits Checked
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 Final Cut Pro (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 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.
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