JMFRegistry can Not detect mywebcam

[ala]

hi,
i have problem with getting my camera detected by JMFRegistry.
my camera :
Vimicro USB Camera LTI301P
the error message: Capture device query unsuccessful!

on the console there is:
DirectSound Capture Supported = false
JavaSound Capture Supported = true
JavaSoundAuto: Committed ok

and on my code :
Vector devices = CaptureDeviceManager.getDeviceList(vidformat);
returns null;

any one have idea how to solve this?

thanx

Ala' Eddin