private void TestMediaName()
        {
            int          hr;
            const string fn = "foo.avi";
            string       s;

            hr = m_pSource1Src.SetMediaName(fn);
            DESError.ThrowExceptionForHR(hr);

            hr = m_pSource1Src.GetMediaName(out s);
            DESError.ThrowExceptionForHR(hr);

            Debug.Assert(fn == s, "MediaName");
        }