NewTek TriCaster 855 - Manual (Page 161)

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show a useful countdown to the (production) Start or End times when the corresponding
switches are enabled in the Timecode Configuration panel.
LTC TIMECODE 7.3.3
Linear timecode is by far the most common method of
sharing an external timecode reference in video
production.
Output from an external timecode generator is supplied
to devices in the video pipeline using a standard audio
connection. TriCaster 855 uses Audio Input 7 for this
purpose, while TriCaster 455 uses Audio Input 3 (see
Section 3.7)
TriCaster decodes time stamps from the audible signal,
and uses the values for clock displays and embedded
timecode when recording video. This is a great asset
for post-production purposes.
Figure 142
Enable linear timecode using the switch labeled Use External timecode (LTC) in Timecode
Configuration.
Sound from the audio input tasked with supplying timecode is automatically muted for
recording and output purposes when LTC timecode is enabled, but you can un-mute it briefly in
the Audio Mixer to let you adjust input levels.
Hint: The timecode display in the Live Desktop titlebar is tinted blue when external timecode is in
use. If the external connection is lost for any reason, the display changes to white.
TriCaster will attempt to maintain continuous timecode from the interruption on, until a valid
signal is restored (in which case the display turns blue once more).