Grass Valley PVS Series System Guide v.4.0 Dec 10 200 - Manual (Page 113)

Auto-timing synchronous video feeds
July 27, 2001 Profile XP System Guide 113
Auto-timing synchronous video feeds
You can enable auto-timing to ensure clean switching between other inputs and
decoder outputs. Auto-timing is accomplished by frame buffers on each video input
providing an infinite auto-timing window. When auto-timing is used, the frame buffer
automatically times synchronous feeds relative to the system reference: zero time +16
lines by default.
NOTE: If you are using the Profile XP Media Platform to switch between video
inputs and decoder outputs (playback), you must set the output timing mode to E to
E Timed Outputs. For more information see “Adjusting video output timing” on
page 107.
When auto-timing is enabled, a maximum delay of slightly more than 1 frame can
occur to time the video input. Audio channels assigned to the same video channel
automatically track the video delay to eliminate lip sync errors.
To enable auto-timing for synchronous feeds:
1. Choose Video Input in the Configuration Manager window. The Video Input dialog
box appears.
2. Click Next to navigate to Video Input page 3 of 3.
3. Select a video input from the list or click Select All to configure all inputs at the
same time.
4. Select the option “Auto-time using the internal frame sync (default)”, then click
Finish .