UWP Media Capture无法通过WebCam录制视频

Question

我正在尝试开发一个UWP应用，我需要通过网络摄像头录制视频。 我在这里遵循了有关它的Microsoft教程，但问题是我一次又一次地跟随错误，并且记录无法正常工作。

错误

“必须先初始化此对象，然后才能执行请求的操作。\\ r \\ n需要先初始化此对象，然后才能执行请求的操作。”

这是我的代码：

int counter = 1;
                var myVideos = await Windows.Storage.StorageLibrary.GetLibraryAsync(Windows.Storage.KnownLibraryId.Videos);
                StorageFile file = await myVideos.SaveFolder.CreateFileAsync("survillance "+DateTime.Now.ToString("dd-MM-yyyy")+"_"+counter+".wmv", CreationCollisionOption.GenerateUniqueName);

                try
                {
                    MediaEncodingProfile recordProfile = null;
                    recordProfile = MediaEncodingProfile.CreateWmv(VideoEncodingQuality.Auto);

                    _mediaRecording = await _mediaCapture.PrepareLowLagRecordToStorageFileAsync(recordProfile,file);
                    await _mediaRecording.StartAsync();


                    status.Text = "Video recording in progress...";


                }
                catch (Exception ex)
                {

                    status.Text = "Failed to Capture...";
                    var msg = new MessageDialog(ex.Message, "Capturing Error").ShowAsync();
                }

请帮助我解决问题。 谢谢

Answer 1

您忘了在开始捕获之前调用MediaCapture.InitializeAsync（） 。

MediaEncodingProfile recordProfile = MediaEncodingProfile.CreateMp4(VideoEncodingQuality.Auto);

_mediaCapture   = new MediaCapture();
_mediaCapture.InitializeAsync();

_mediaRecording = await _mediaCapture.PrepareLowLagRecordToStorageFileAsync(recordProfile,file);
await _mediaRecording.StartAsync();