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How can I set the camera speed using Microsoft's VFW function library?

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How can I set the camera speed using Microsoft's VFW function library? Delphi/Windows SDK/API
Http://www.delphi2007.net/DelphiMultimedia/html/delphi_20061108214139168.html
For example, I used capcapturesetsetup (capwnd, @ capparms, sizeof (tcaptureparms ));
Cappreviewrate (capwnd, 33) does not seem to have changed the speed. ProgramCapture so fast? Thank you!

Is a callback function problem

Could you give me a detailed description? Please advise!

Http://xunway.com/gcom/wwwroot/zl/vfw1.htm
Http://xunway.com/gcom/wwwroot/zl/vfw2.htm

Still not good! Can I give an example?

Instead of using VFW, you can use a third-party control. The speed is quite fast.

Dspack is the correct method.
VG is also OK, but it is not open-source
VFW is the worst

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