Why can't I make the applet work?

Question

I have developed an applet to capture the video stream from a Logitech (usb) camera and display it in the applet. This is a clone of another program that captures a network camera video stream and does the same thing.
I am using JBuilder 2005 and when I run the applet in the JBuilder applet viewer, it works fine, but not when I attempt to run it in the browser.
In the network camera application, I was able to overcome this by signing the jar file and it would run in the browser.
In the Logitech application signing the jar file does not work. I get the mesage that asks me if I want to accept the certificate, but it still does not initialize the camera.
Since I can use it in the Applet Viewer, I have to assume that all the connections are set up OK.
But the application fails when trying to get the capture device in:
di = CaptureDeviceManager.getDevice(str2);
I put the startup code in a thread and perform several iterations with a slight delay, suspecting that there may be a timing issue, but that was not the problem.
This code also works in a stand-alone application version.
The only thing I can think of is that there is some other connection or security issue that I am not addressing.
Since signing the jar file works with network video streams, I have to think that there is something different between USB and network video streams, but I have no clue as to what it might be.
Anyone have any suggestions?

Answer 1

from the JMF readme file
Security Note
During the installation, you will be asked two security related questions:
* Permit recording from an applet
If you agree to this, JMF will allow applets to capture audio and video from the local capture devices. It is possible for a malicious hidden applet on a web page to quietly record sounds or video from your system and transmit the data back to a system on the internet. This is usually a risk only if you visit unfamiliar web sites.
You can disable or enable this feature by running the JMFRegistry application (or choose Preferences from the JMStudio File menu), modify the setting in the User Settings tab and commit the changes.
* Permit writing local files from an applet
This is a greater security risk since a malicious applet can overwrite files on your hard disk without your knowledge. Enable this feature only if you need it for a specific application and are sure that you will not visit any possibly malicious web sites.
You can disable or enable this feature by running the JMFRegistry application (or choose Preferences from the JMStudio File menu), modify the setting in the User Settings tab and commit the changes.