Windows Phone 7 创建视频流

嗨，我正在Windows Phone 7中创建一個项目，该项目将捕获视频并将其传输到其他设备。这是我到目前为止的代码。

// Initialize the camera if it exists on the device.
        if (videoCaptureDevice != null)
        {
            captureSource = new CaptureSource();
            fileSink = new FileSink();
            // Create the VideoBrush for the viewfinder.
            videoRecorderBrush = new VideoBrush();
            CompositeTransform transform = new CompositeTransform();
            transform.CenterX = 0.5;
            transform.CenterY = 0.5;
            transform.Rotation = 90;
            videoRecorderBrush.RelativeTransform = transform;
            videoRecorderBrush.SetSource(captureSource);
            // Display the viewfinder image on the rectangle.
            viewfinderRectangle.Fill = videoRecorderBrush;
            // Start video capture and display it on the viewfinder.
            captureSource.Start();
            // Set the button state and the message.
        }

我想要的是将捕获的视频保存到某种缓冲区，以便我可以发送它并且其他设备可以看到该视频（视频通话）。有什么想法吗？