问题描述
您好，我想在UWP应用中创建一个视频文件，然后播放该文件。我使用Windows.Storage.Pickers.FileSavePicker（）来创建目标文件。我使用Picker的原因是我希望用户能够写入他们想要的文件夹，而不仅仅是应用程序的数据文件夹。
Hello, I want to create a video file in a UWP app, and then play the file. I use Windows.Storage.Pickers.FileSavePicker() to create the destination file. The reason I use Picker is that I want users to be able to write to the folders they want, not just the application's data folder.
;        var picker = new Windows.Storage.Pickers.FileSavePicker（）; picker.FileTypeChoices.Add（QUOT; MP4文件" ;,新列表与LT;字符串>（）{"的.mp4"}）;              destVideoFile = await picker.PickSaveFileAsync（）;
var picker = new Windows.Storage.Pickers.FileSavePicker(); picker.FileTypeChoices.Add("MP4 files", new List<string>() { ".mp4" }); destVideoFile = await picker.PickSaveFileAsync();
我使用以下内容将视频播放器放入XAML页面：
I use the following to put a video player in an XAML page:
&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP; < MediaPlayerElement x：Name =" MediaPlayer"自动播放= QUOT假QUOT; AreTransportControlsEnabled = QUOT;真" />
<MediaPlayerElement x:Name="MediaPlayer" AutoPlay="False" AreTransportControlsEnabled="True" />
然后我使用以下内容设置文件
Then I use the following to set the file
&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP; MediaPlayer.Source = MediaSource.CreateFromStorageFile（destVideoFile）;
MediaPlayer.Source = MediaSource.CreateFromStorageFile(destVideoFile);
我保存与该文件：
&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP ;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP; VAR saveOperation = composition.RenderToFileAsync（destVideoFile，MediaTrimmingPreference.Precise）;
var saveOperation = composition.RenderToFileAsync(destVideoFile, MediaTrimmingPreference.Precise);
请注意，我没有实际微调，所以微调参数是的伪像我复制的一些代码。
Note that I'm not actually trimming, so the trimming param is an artifact of some code I copied.
一切正常，有点像。我可以在一次写入后播放目标视频，但在多次写入时，它会显示"错误：视频无法解码。"该文件没有被锁定或任何东西，因为我可以从命令行播放它。
Everything works, sort of. I can play the dest video usually after a single write, but on multiple writes it says "Error: Video could not be decoded." The file isn't being locked or anything, because I can play it from a command line.
是否有某个UWP示例显示视频创建&然后在同一个应用程序中玩？我也看到了这个，但只播放声音和没有视频。有没有办法从UWP应用程序中弹出视频播放器？ ！谢谢
Is there a UWP Sample somewhere that shows video creation & then playing in the same app? I also saw this, but that only plays sound & no video. Is there a way to pop a video player from a UWP app? Thanks!
的MediaPlayer mediaPlayer1 =新的MediaPlayer（）; mediaPlayer1.Source = MediaSource.CreateFromStorageFile（destVideoFile） ; $ mediaPlayer1.Play（）;
MediaPlayer mediaPlayer1 = new MediaPlayer(); mediaPlayer1.Source = MediaSource.CreateFromStorageFile(destVideoFile); mediaPlayer1.Play();
推荐答案
我想我想出来了。在播放器表单中，执行此操作以设置视频StorageFile：
I think I figured this out. In the Player form, do this to set the video StorageFile:
public void setVideo（StorageFile baseVideoFile） { if（baseVideoFile == null） 返回; $ if（mediaSource！= null） mediaSource.Dispose（）; $ MEDIASOURCE = MediaSource.CreateFromStorageFile（baseVideoFile）; &NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP; MediaPlayer.Source = mediaSource; }
public void setVideo(StorageFile baseVideoFile) { if (baseVideoFile == null) return; if (mediaSource != null) mediaSource.Dispose(); mediaSource = MediaSource.CreateFromStorageFile(baseVideoFile); MediaPlayer.Source = mediaSource; }