实现Windows Phone 8多媒体：视频

（1）拍摄视频

拍摄视频和拍摄相片的方法是基本一致的：

MediaCapture mediaCapture;
MediaEncodingProfile videoEncodingProperties;

protected override async void OnNavigatedTo(NavigationEventArgs e)
{
    HardwareButtons.CameraHalfPressed += HardwareButtons_CameraHalfPressed;
    HardwareButtons.CameraReleased += HardwareButtons_CameraReleased;

    videoCaptrueElement.Source = await Initialize();
    await mediaCapture.StartPreviewAsync();
}

async void HardwareButtons_CameraHalfPressed(object sender, CameraEventArgs e)
{
    if( mediaCapture != null )
    {
        var video = await KnownFolders.VideosLibrary.CreateFileAsync("video.mp4", CreationCollisionOption.GenerateUniqueName);
await mediaCapture.StartRecordToStorageFileAsync(videoEncodingProperties, video);
    }
}

async void HardwareButtons_CameraReleased(object sender, CameraEventArgs e)
{
    if( mediaCapture != null )
    {
        await mediaCapture.StopRecordAsync();
    }
}

private async Task<MediaCapture> Initialize()
{
    mediaCapture = new MediaCapture();
    await mediaCapture.InitializeAsync();

    mediaCapture.VideoDeviceController.PrimaryUse = CaptureUse.Video;

    videoEncodingProperties = MediaEncodingProfile.CreateMp4(VideoEncodingQuality.Vga);

    return mediaCapture;
}

protected override void OnNavigatedFrom(NavigationEventArgs e)
{
    if( mediaCapture != null )
    {
        mediaCapture.Dispose();
        mediaCapture = null;
    }
}

详细说明：http://wp.662p.com/thread-8226-1-1.html