Hi, It is not listed in the supported interfaces that are visible using GraphStudio. Also one user reported this as a bug. However, I have not written a program to actually verify this. I did look carefully at the documentation in MSDN and determined, perhaps incorrectly, that there is nothing for an AVStream driver to do to expose this interface; however, it is not clear that KsProxy will expose that. Since the interface is not listed in the supported interfaces using GraphStudio and since it was reported by customer...I assumed that reported lack of support to be true. I will write a program to specifically verify it. After I do it, will report back. I anticipate that report is reliable based on the source, however. From: wdmaudiodev-bounce@xxxxxxxxxxxxx [mailto:wdmaudiodev-bounce@xxxxxxxxxxxxx] On Behalf Of Tim Roberts Sent: Monday, July 11, 2011 12:50 PM To: wdmaudiodev@xxxxxxxxxxxxx Subject: [wdmaudiodev] Re: IAMPushSource support in AVStream Sam Tertzakian wrote: I have an AVStream Video/Audio capture driver. I want KsProxy to expose the IAMPushSource interface on the audio and/or video filter. The documentation in MSDN states that if the pin is exposed as a PIN_CATEGORY_CAPTURE and IKsPropertySet is also exposed in the filter that the filter is considered a "Live Source". The documentation also states that "Live Sources" should expose IAMPushSource. But it does not appear to be the case...the interface does not appear to be supported. Why do you think so? How did you check this? Is there something I need to do (such as support a specific property set) in the AVStream driver to cause that interface to be exposed? Ksproxy should expose that for all live capture sources. -- Tim Roberts, timr@xxxxxxxxx Providenza & Boekelheide, Inc.