Osprey PCI User Guide
ViewCast
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Preview video that is directly rendered on the screen does not use deep pipelining and cannot
benefit from it. There has been some evidence that too many buffers for direct rendering can harm
performance.
On the Capture property, you can increase the number of buffers from the default 20 for deeper
pipelining and more resistance to dropped frames.
On the Capture property, you can reduce the number of buffers to around 5 if the video is going to
be used only for direct rendering. Remember to put the number back to 20 or more for capture or
encoding
– 5 may not be enough and may result in many dropped frames.
On the Preview property, you can increase the number of buffers to 20 or more if you are using it
for capture or encoding rather than direct rendering.
Diagnostic Logging
If you have a problem and contact ViewCast Support, they may request that you provide a
diagnostic log from the system that is showing the problem. In this case, you would be directed to
enable this control group. The driver will make a record of parameters and statistics from capture
runs. These logs are written to the standard kernel driver debug stream, which can be captured and
displayed by utilities such as DbgView. ViewCast support will supply you with DbgView if you need it,
or it is available from the Microsoft developers’ website. The log is plain text but its interpretation is
highly specialized. You would want to send it to ViewCast where it will be reviewed by Osprey
developers.
Enable Diagnostic Logging only when ViewCast Technical Services specifically recommends it.
Summary of Contents for Osprey PCI
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Page 29: ...Osprey PCI User Guide ViewCast 23 Figure 15 VbiGraph utility...
Page 56: ...Setting Driver Properties 50 ViewCast Figure 35 Extras...
Page 67: ...Osprey PCI User Guide ViewCast 61 Figure 46 Weighting...
Page 70: ...Setting Driver Properties 64 ViewCast...
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Page 118: ...Appendix C Troubleshooting 112 ViewCast...
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