43
Chapter 5: Analog Video Driver Properties
You can use this control to reposition the video.
If you start video preview running before you
use this control, repositioning will be interactive.
Use the arrow buttons to move the video, and
the “0” button to reset it to the normal position.
With uncropped video, the video will shift only on
every second increment 0, 2, 4… . This control
affects all inputs on the currently selected
device.
PCI Compatibility Mode
Some PCI bridges present compatibility problems
for the Osprey hardware, especially systems
using the 430FX chipset. The symptom will be
dropping of a significant amount of audio and/or
video data. Use the “Normal” setting unless you
are seeing this symptom, but if you are seeing it,
try setting this control to “430FX”, or, possibly, to
“VIA/SYS”. The change will take effect as soon
as you click “Apply” or “OK”.
Gamma Correction
The gamma correction control (figure 9) adjusts
the gamma curve of capture and/or preview
video. The lumina or intensity component of
analog video is not linear. It is biased (1) to
improve the effective bandwidth for transmitting
low intensity information, and (2) to match the
nonlinear response of a standard analog TV set.
For some digital or computer video applications,
the standard gamma curve is not correct, and
you may want to remove it partly or entirely.
To test this interface, run SwiftCap. Turn off
preview. Set the video capture source to YUY2
format. Set the video capture destination to
“Renderer” and select “Video Renderer”, not
VMR7 or VMR9. Start the renderer and open the
driver properties dialog to the Device page.
Note the following points:
1. This gamma control is separate from
the Gamma slider on the system-
provided Video Proc Amp property
page. That control will remain greyed
out even when the custom gamma
correction control is enabled.
2. Gamma correction works only on YUV
video formats, which include YUY2,
UYVY, I420, YVU9, and greyscale
(“Grey8” or “RGB8”). It does not
work on RGB32, RGB24, or RGB15.
The Gamma Correction Control
9
Summary of Contents for Osprey-300
Page 1: ...Osprey 300 User s Guide...
