地铁应用程序中的视频捕获

本文关键字：的视频 应用程序 地铁 | 更新日期: 2023-09-27 18:33:02

我目前正在为Windows 8平板电脑开发视频聊天应用程序，使用Visual Studio Express for Windows 8 IDE。我无法使用MediaCapture捕获流。我想在捕获元素中捕获视频，然后出于测试目的将其显示在mediaelement中。我基本上想将IRandomAccessStream转换为字节，反之亦然。以下是我的代码：

public sealed partial class MainPage : Page
{
    MediaCapture mediaCapture;
    IRandomAccessStream randomAccessStream;

    public MainPage()
    {
        this.InitializeComponent();
        mediaCapture = new MediaCapture();
        randomAccessStream = new InMemoryRandomAccessStream();
    }

    /// property is typically used to configure the page.</param>
    protected override void OnNavigatedTo(NavigationEventArgs e)
    {
    }

     async private void startCapture(object sender, RoutedEventArgs e)
     {
         await mediaCapture.InitializeAsync();
         capturePreview.Source = mediaCapture;
         MediaEncodingProfile profile = MediaEncodingProfile.CreateWmv(VideoEncodingQuality.Auto);
             await mediaCapture.StartRecordToStreamAsync(profile, randomAccessStream);

     }
     async private void stopCapture(object sender, RoutedEventArgs e)
     {
         await mediaCapture.StopRecordAsync();
         await randomAccessStream.FlushAsync();
         randomAccessStream.Seek(0);
         // want to convert this randomAccessStream into byte[]
         mediaElement.SetSource(randomAccessStream, "video/x-ms-wmv");
     }

}

地铁应用程序中的视频捕获

我已经尝试了下面的代码，它对我来说工作正常。仅在事件中添加了代码。

public sealed partial class MainPage : Page
{
    MediaCapture mediaCapture;
    IRandomAccessStream randomAccessStream;
    public MainPage()
    {
        this.InitializeComponent();
        mediaCapture = new MediaCapture();
        randomAccessStream = new InMemoryRandomAccessStream();
    }
    /// <summary>
    /// Invoked when this page is about to be displayed in a Frame.
    /// </summary>
    /// <param name="e">Event data that describes how this page was reached.  The Parameter
    /// property is typically used to configure the page.</param>
    protected override void OnNavigatedTo(NavigationEventArgs e)
    {
    }
    private async void StartButton_Click(object sender, RoutedEventArgs e)
    {
        await mediaCapture.InitializeAsync();
        MediaEncodingProfile profile = MediaEncodingProfile.CreateWmv(VideoEncodingQuality.Auto);
        await mediaCapture.StartRecordToStreamAsync(profile, randomAccessStream);
    }
    private async void StropButton_Click(object sender, RoutedEventArgs e)
    {
        await mediaCapture.StopRecordAsync();
        await randomAccessStream.FlushAsync();
        randomAccessStream.Seek(0);
        // want to convert this randomAccessStream into byte[]
        mediaElement.SetSource(randomAccessStream, "video/x-ms-wmv");
    }
}
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