如何在WP8中录制视频时更改相机的分辨率

Question

我在这里使用微软提供的视频录制示例。我想更改正在我的应用程序中录制的视频的分辨率。当前默认情况下以最高分辨率录制。如何做到这一点？

videoCaptureDevice.DesiredFormat = new VideoFormat(PixelFormatType.Unknown, 480, 640, 30);

上面的语句正在引发Argument Exception。

此外，如果可能的话，让我知道如何从前置摄像头拍摄？

如何做到这一点？请帮忙。

Answer 1

AudioVideoCaptureDevice.OpenAsync的第二个参数是分辨率。使用AudioVideoCaptureDevice.GetAvailableCaptureResolutions(sensor)可以获得分辨率。

Answer 2

您可以试试这个。

private AudioVideoCaptureDevice VideoRecordingDevice;
private Windows.Foundation.Size resolution = new Windows.Foundation.Size(320, 240);
VideoRecordingDevice = await AudioVideoCaptureDevice.OpenAsync(CameraSensorLocation.Back, resolution);

注意：请记住，它可能只用于wp8或更高版本。

Answer 3

解决方案是（据我所知）

     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;

这将产生最低分辨率的视频

Answer 4

使用AudioVideoCaptureDevice录制视频

StorageFolder isoStore = await ApplicationData.Current.LocalFolder.GetFolderAsync("Shared");
            var file = await isoStore.CreateFileAsync("foos1.wmv", CreationCollisionOption.ReplaceExisting);
            using (var s = await file.OpenAsync(FileAccessMode.ReadWrite))
            {
                Windows.Foundation.Size resolution = new Windows.Foundation.Size(640, 480);
                avDevice = await AudioVideoCaptureDevice.OpenAsync(CameraSensorLocation.Back,
                    AudioVideoCaptureDevice.GetAvailableCaptureResolutions(CameraSensorLocation.Back).Last());
                VideoBrush videoRecorderBrush = new VideoBrush();
                videoRecorderBrush.SetSource(avDevice);
                viewfinderRectangle.Fill = videoRecorderBrush;
                await avDevice.StartRecordingToStreamAsync(s);
                Thread.Sleep(30000);

                await avDevice.StopRecordingAsync();

            }

            new MediaPlayerLauncher()
            {
                Media = new Uri(file.Path, UriKind.Relative),
            }.Show();