User Manual

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A.8 MORE QUESTIONS AND ANSWERS
A.8.1 CAN I DO ANYTHING TO IMPROVE LATENCY/AUDIO SYNC?
Latency might be defined as the ‘transit time’ for the a/v stream. Each device in the
video chain introduces some limited (transmission) delay.
TriCaster’s latency is very minimal (as little as 1 frame), but you can take measures
to keep it to a minimum – first and foremost, by genlocking your video devices – see
Section 8.1.3. For genlocked sources, consider disabling TriCaster’s Frame Sync – see
Section 8.2.3.
In a seemingly related matter, note that audio and video passing through TriCaster
are always synchronized. However, aspects of the physical design for IMAG (video
projection) installations can make mimic a sync issue for viewers at some locations
in the auditorium. These issues are discussed in detail in Section B.3, IMAG and
Latency.
SUPPLEMENTARY QUESTION:
Q: Why does latency seem higher for certain video formats (i.e. 24p, 25p, or 30p)?
A: TriCaster passes frames through the switcher at the appropriate frame rate.
When the session format calls for frames at 60Hz, displayed frames are refreshed
much more often than (for example) a 24p format. Consequently, apparent latency
will also be less than half what it would be at 24Hz.
In general, the lower the frame-rate of the session video format, the higher latency
will seem to be.
A.8.2 WHY IS MY POWER SUPPLY BEEPING?
TriCaster 8-input systems provide redundant, replaceable power supply units.
When you i) disconnect or ii) power down just one of the modules, or iii), if a PSU
should fail, a beep is sounded to alert you. If you wish, you can mute the alert by
pressing the green button on the back of the unit.