Re: Setting capture card bit rate programmatically

Hello,

I'm trying to write a service to capture video from an h.264 capture card (Euresys U16 H.264).  The card provides hardware compression at variable bit rates.  I can set the bit rate using the dialog in the DVR demo, but I'm trying to do it programmatically without having to display a dialog.

Is there a control I can use to access that?  Is it specific to the card?  Is there a way to access the card and set the bit rate through the SDK?

Thank you.

Please answer the following questions:
- Does your h.264 capture card have a standard DirectShow driver?
- Does it have a DirectShow programming interface that you can use to control the capture properties programmatically?
- Does the capture card work with one of the LEADTOOLS capture demos shipped with the multimedia SDK?

Thanks,
Maen Badwan
LEADTOOLS Technical Support

Yes to all three.

I can use the DVR demo to capture video and one of the dialogs allows be to set the bit rate.

You can get the interface of the capture source by using the ltmmCaptureCtrl.GetSubObject method as follows:
==========
Dim CapSrcp As New DemoCaptureSourceInterface

ltmmCaptureCtrl1.VideoDevices.Selection = 0 'you need to change this to 'the index of your capture source

ltmmCaptureCtrl1.TargetFormat = ltmmCapture_TargetFormat_Avi
ltmmCaptureCtrl1.TargetFile = "c:\delme\capture.avi"

Set CapSrcp = ltmmCaptureCtrl1.GetSubObject(ltmmCapture_Object_VideoCaptureFilter)

'Add your code here to change the capture source properties
==========

For more information, please see the following help topics in the LEADTOOLS Multimedia help file:
- ltmmCaptureCtrl.GetSubObject Method
- Directly Access the DirectShow Objects (Visual Basic)

Thanks,
Maen Badwan
LEADTOOLS Technical Support