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Setting Driver Properties
24 ViewCast
Cancel
Click Cancel to reject the settings and close the window.
Apply
Click Apply to apply the settings.
Help
Click Help to access the user guide.
Horizontal Format
Figure 20. Horizontal Format
The Horizontal Format has the following controls.
Square Pixels
Use the Square Pixels setting for normal 4:3 video (Figure 20) that is viewed
via a computer monitor. This setting results in a square aspect ratio sampling
of the source video. This results in a source image of 640 x 480 for 525-line
standards and 768 x 576 for 625-line standards.
CCIR-601
Use the CCIR-601 setting for 4:3 video that is viewed on a dedicated video
monitor. This setting results in a CCIR-601 aspect ratio sampling of the source
video. It results in a video input horizontal size of 720 pixels for both 525-line
and 625-line standards. This sizing is standard for dedicated monitors but the
resulting video appears horizontally stretched (525-line) or squeezed (625-line)
on a computer monitor.
It is more efficient to set the horizontal mode to match the size of the output.
For example, if your target video size is 640 x 480 using Square Pixel sizing in
PostProcessing Mode, it will avoid an unnecessary software scaling step in the
driver.
On some systems, for reasons external to this driver, 640 x 480 video renders
on screen a lot faster than 720 x 480 video – that is, the speed difference is a
lot more than the 9:8 ratio of numbers of pixels.
16:9 Wide
Select 16:9 Wide for 1.85:1 anamorphic video such as DVD content and any
widescreen content. The output video size is 852 x 480 for 525-line standards,
and 1024 x 576 for 625-line standards. To actually see output of this size, you
have to also select this size in your application.
Use WideScreen
Signal (WSS)
The Use WideScreen Signal (WSS) control enables automatic sidebars and
letterboxing when the input video aspect ratio does not match the output
aspect ratio. If the aspect ratio of your content is subject to change between
16:9 and 4:3, it is useful to enable this control.