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User Bits
—for monitoring variable frame rate (VFR) timecode (for example,
Varicam), you may wish to monitor the user bits embedded in the timecode. If
you set this checkbox, Io HD will detect and interpret the user bits and display
them next to the checkbox.
Output
Use QuickTime Timecode—
when checked, this directs Io HD to output timecode
from the QuickTime timecode track. When not checked, Io HD 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.
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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