AJA Io4K - Manual (Page 44)

Io XT/4K v10.5r2 www.aja.com 44
Timecode Input Settings
RP-188 Timecode <n>: In RP-188 timecode (SMPTE 12M-2) there can be multiple timecode types in the data
stream. Use this pull-down to select the one you wish to monitor:
• RP188 LTC (Linear timecode)
• RP188 VITC 1 (Vertical Interval timecode)
• RP188 VITC 2
• LTC Port input
The selection will be displayed in the timecode value displayed to the right of the pull-
down.
User Bits: For monitoring a variable framerate (VFR) timecode (such as Varicam), you may wish to
check the User-bits box. If you set this checkbox, Io XT/4K will detect and interpret the
user-bits and display them next to the checkbox. You will see the original framerate (30
fps in the figure below) followed by the adjusted frame padding (two digits reporting
discarded and retained frame padding).
NOTE: SMPTE 12M-2 is the updated name and specification for what was RP-188.
Figure 40. AJA Control Panel, Timecode Screen
Timecode Output Settings
Use QuickTime Timecode
(Mac OS Only):
This feature is for Final Cut Pro 7 (or earlier), VTR Exchange, and AJA TV only. When
checked, it directs Io XT/4K to output timecode from the QuickTime timecode track.
Timecode Burn-in: This pulldown selects whether the timecode value is displayed in a “burned-in” window
in video output. 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 for all of the
Io XT/4K outputs. This can be useful for synchronizing, choosing edit points, dailies, and
many other purposes.
Timecode Offset (entry field
and FPS pull-down):
When QuickTime timecode in disabled, this text entry field allows you to generate a
timecode based on the offset entry. You can select a framerate from the pulldown menu
at the right side of the pane. Use that same value here as the source video 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