Vb.net 在windows phone 8中捕获视频时最小化视频文件大小

我正在应用程序中录制视频并将其上载到服务器。对于小视频，该应用程序运行良好，但如果视频长度超过10秒，视频大小将变得非常大，应用程序将崩溃

如何最小化视频的大小？我可以设定决议吗？我也可以压缩视频吗

你还建议我做什么来确保视频不会太大

这是我的密码：

Public Sub InitializeVideoRecorder()
        If captureSource Is Nothing Then
            ' Create the VideoRecorder objects.
            captureSource = New CaptureSource()
            fileSink = New FileSink()

            videoCaptureDevice = CaptureDeviceConfiguration.GetDefaultVideoCaptureDevice()

            ' Add eventhandlers for captureSource.
            AddHandler captureSource.CaptureFailed, AddressOf OnCaptureFailed

            ' Initialize the camera if it exists on the device.
            If videoCaptureDevice IsNot Nothing Then
                ' Create the VideoBrush for the viewfinder.
                videoRecorderBrush = New VideoBrush()
                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.
                UpdateUI(ButtonState.Initialized, "")
            Else
                ' Disable buttons when the camera is not supported by the device.
                UpdateUI(ButtonState.CameraNotSupported, "A camera is not supported on this device.")
            End If
        End If
End Sub

---

为了减少视频大小，我们可以使分辨率尽可能低

VideoCaptureDevice webcam = CaptureDeviceConfiguration.GetDefaultVideoCaptureDevice();

 int videoformatcount = webcam.SupportedFormats.Count(); //We will get the avilable video format

  if (videoformatcount > 0)
             {
                var Temp = webcam.SupportedFormats;

                VideoFormat objVideoFormat = Temp[videoformatcount - 1];

                webcam.DesiredFormat = new VideoFormat(PixelFormatType.Format8bppGrayscale, objVideoFormat.PixelWidth, objVideoFormat.PixelHeight, 1);
            }

captureSource.VideoCaptureDevice = webcam;

这会对你有所帮助。视频的分辨率必须非常低（可用）