Latency and External Monitoring In Final Cut Pro
It is safe to say that nearly all digital video and audio output cards, including firewire, present inherent processing delays to signals outputting from the computer, an effect known as Latency. If you are just getting into the video editing world, then you should be acquainted with this term. Latency is when external video and audio coming from the built-in FireWire port or some third party interface appears to be several frames behind the video you are watching on your computer screen.

Changing the Frame Offset can help compensate for this delay, but keep in mind that the frame offset is active only when sequence real-time effects are handled by Final Cut Pro.
Setting The Frame Offset Between The Workstation Display And External A/V:
1 Select Final Cut Pro > System Settings.
2 Select Playback Control tab.
3 Enter an amount in whole frames between 0-30 in the Frame Offset number field. The default is 4. Set This value according to how many frames your External A/V is off from your workstation display.
4 Choose Ok.
5 Compare the offset between your computer display and your external monitor.
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