Cisco D9054 Installation And Operation Manual page 157

Setting Up the AAC Audio Input,
10. Set the Relative Delay.
The legal range is from -1000 to 1000 ms.
Use this field if you want to adjust the encoding audio delay to synchronize
audio with video in a program which has both.
Example: If you use external video equipment which adds to the video delay,
you type a positive external audio delay value corresponding to the external
video delay. The resolution is 1 millisecond.
Note: You cannot set a positive relative audio delay greater than the end-to-end
delay determined by the video encoder. For information about the video delay,
see Setting Up the H.264 Video Encoder Delays, page 5-21.
11. Click Apply.
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Continued
D9054 HDTV Encoder Intstallation and Operation Guide 5-73