SDI2USB 3.0 User Guide
DirectShow video adjustments (Windows)
Item
Description
Default image
Select an image to display when there is no signal captured from your
video grabber. The uncompressed BMP image must be located on your
video capture workstation.
Scale image to match stream
resolution
If you are using a fixed resolution and choose not to scale the image, the
captured image will appear cropped to your specified resolution when
capturing with a DirectShow compatible utility. Generally the cropping
happens at the top left corner of the video, but test first to be sure you
see the same results.
Normally, when choosing to use a fixed resolution with DirectShow, you'll
want the Epiphan drivers to scale the image for you. Use the slider to
determine the type of scaling you'd like. Scaling performance is a tradeoff
between quality and CPU cycles on the capture computer. Lower quality
(left side of the slider) is faster and takes fewer CPU cycles, where higher
quality (right side of the slider) is slower and takes more CPU time. Try
different values out to find the one that works for your specific use case.
Flip image vertically
Use this check box to flip your captured image vertically when sending
over DirectShow.
Limit frame rate to
Use this to limit (or fix) the frame rate for the data you send to
DirectShow.
For example, if you're using a DirectShow-compatible application like
WebEx and you're sharing something relatively static (like a PowerPoint
presentation), you could limit the frame rate to 5 fps, which would be
plenty for people watching at the other end, and would avoid filling your
data pipe with identical images.
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