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改變視頻的簡單應用程序。MediaPlayer隨機使用CPU [UWP] [UI.Composition]
雖然在診斷工具CPU運行上升,並擁有約50%(任務管理器5%),直至停止,另一個來看,它保持在5%(任務管理器小於1%)。
代碼一直都是一樣的。視頻格式相同。
在Performance Profiler中,我看到nvwgf2umx.dll(nvidia)100%正在使用中調用WaitForSingleObjectEx和ReleaseSemaphore。
爲什麼每個隨機運行我得到CPU消耗的兩個變種?
private void MainPage_Loaded(object sender, RoutedEventArgs e)
{
_playlist = new MediaPlaybackList();
foreach (var uri in _uris)
{
_playlist.Items.Add(new MediaPlaybackItem(MediaSource.CreateFromUri(uri)));
}
_mediaPlayer = new MediaPlayer
{
IsLoopingEnabled = true,
AutoPlay = false,
IsMuted = true,
Source = _playlist,
};
_mediaPlayer.SetSurfaceSize(new Size(512, 512));
_visual = ElementCompositionPreview.GetElementVisual(this);
_compositor = _visual.Compositor;
_surfaceVideoBrush = _compositor.CreateSurfaceBrush(_mediaPlayer.GetSurface(_compositor).CompositionSurface);
_surfaceVideoBrush.Stretch = CompositionStretch.UniformToFill;
_spriteVisualVideo = _compositor.CreateSpriteVisual();
_spriteVisualVideo.Size = new Vector2(512, 512);
_spriteVisualVideo.Brush = _surfaceVideoBrush;
ElementCompositionPreview.SetElementChildVisual(Grid, _spriteVisualVideo);
_timer.Tick += _timer_Tick;
_timer.Start();
}
private void _timer_Tick(object sender, object e)
{
_timer.Interval = TimeSpan.FromMilliseconds(Random.Next(200, 2000));
NextVideo();
}
private void NextVideo()
{
_mediaPlayer.Pause();
_playlist.MoveTo((uint)Random.Next(0, 15));
_mediaPlayer.Play();
}
XAML只有1格
PC - 酷睿i7 4770,NVIDIA GTX9700