hp scalable visualization digital compositor
sv6 compositor frame delay
Appendix A 103
sv6 compositor frame delay
This feature allows you to control when video frames are sent to the
output device. The compositor is instructed to delay the output of the
left-most (when viewed from the rear of the system) output card by one
frame.
Some digital projectors internally delay the video display by one video
frame. If a display is also connected to an hp visualization sv6 system,
the display will be one frame ahead of the projector video. In many cases
this is not an issue. However, if the compositor is driving an active stereo
display (using stereo emitters and active glasses) the projector is
displaying one eye, and the display is displaying the other eye at the
same time. Using a single set of emitters, it is not possible to get an
accurate stereo image on both the projector and the display.
Enabling frame delay tells the compositor to delay the output of the
video signal going to the display device, thus causing the display and
projector to match.
To enable this feature:
1. Add the ScreenOption SlsdCompositorEnableOutputFrameDelay to
/etc/X11/X0screens.
2. Connect the display to the left-most (when viewed from the rear of
the system) compositor output card.
3. Connect the projector to the right-most (when viewed from the rear
of the system) compositor output card.
4. Move the stereo emitter connectors from the back of the compositor
to any fx
10
graphics cards in the sv6 workstations. This shifts the
emitter signals by one frame so they’re in synch with the output
devices.
5. Update to April 2002 or later sv6_enhancements software.
• Download the latest from
http://www.hp.com/go/workstationsupport
• Run the install_sv6_enhancements script to install it to all
systems in the configuration.
