c# - 指定的对象或值不存在

Question

我开发了一个 UWP 应用程序，它可以从网络摄像头捕获视频并将其保存到 UWP 的本地存储中，该应用程序在本地机器上运行良好，但是在将它部署到 RaspberryPi3 上后，我得到了 fo

The Specified Object or Value Does not Exist

文件正在保存到应用程序的本地数据。调试后我知道错误在以下几行:

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

await _mediaCapture.StartRecordToStorageFileAsync(recordProfile, recordStorageFile);
_statuses.Add(DateTime.Now.ToString() + ": " + fileName + " Recording in progress");

如有任何帮助，我们将不胜感激。

Answer 1

The issue maybe due to your USB camera has no micro phone,  but the default capture mode is video and audio.

因此，在调用 MediaCapture.InitializeAsync() 之前，您需要像这样将 StreamingCaptureMode 设置为视频:

            var settings = new Windows.Media.Capture.MediaCaptureInitializationSettings();
            settings.StreamingCaptureMode = Windows.Media.Capture.StreamingCaptureMode.Audio;
            await mediaCapture.InitializeAsync(settings);