private async void btStart_Click(object sender, EventArgs e) { MediaPlayer1.Debug_Mode = cbDebugMode.Checked; MediaPlayer1.Info_UseLibMediaInfo = true; mmLog.Clear(); MediaPlayer1.Video_Renderer.Zoom_Ratio = 0; MediaPlayer1.Video_Renderer.Zoom_ShiftX = 0; MediaPlayer1.Video_Renderer.Zoom_ShiftY = 0; MediaPlayer1.Video_Renderer.Video_Renderer = VFVideoRenderer.VMR9; MediaPlayer1.Source_Mode = VFMediaPlayerSource.LAV; await MediaPlayer1.PlayAsync(); await MediaPlayer1.PIP_Sources_SetSourcePositionAsync(0, _pipInfos[0].Rect, 1.0f); lbSourceFiles.SelectedIndex = 0; timer1.Start(); }