DirectShowビデオ品質の問題

Question

カメラからのライブビデオを表示するためのDirectShowビデオコントロールを使用すると、すべて動作しますが、モーションの歪みは本当に悪いです。それはビデオの端にジャグのようなのこぎり歯を作成します。 usbからPCIキャプチャカードに変更され、改善されていません。カメラベンダーのアプリは美しいフルモーションビデオを表示するので、h/wは大丈夫です。何か案は？

using System; 
using System.Diagnostics; 
using System.Drawing; 
using System.Runtime.InteropServices; 
using System.Windows.Forms; 
using DirectShowLib; 
using System.Runtime.InteropServices.ComTypes; 

namespace VideoDisplayControl 
{ 
// [Guid("43878F19-1E0E-42d2-B72B-88A94418A302"), ComVisible(true)] 
    public partial class VideoDisplayControl : UserControl 
    { 
     public enum PlayState : int 
     { 
      Stopped, 
      Paused, 
      Running, 
      Error, 
      Init 
     } 

     private static int WM_GRAPHNOTIFY = Convert.ToInt32("0X8000", 16) + 1; 

     private PlayState _currentState = PlayState.Stopped; 
     private IVideoWindow _videoWindow = null; 
     private IMediaControl _mediaControl = null; 
     private IMediaEventEx _mediaEventEx = null; 
     private IGraphBuilder _graphBuilder = null; 
     private ICaptureGraphBuilder2 _captureGraphBuilder = null; 
     private float _imageAspectRatio = 0f; 
     private System.Windows.Forms.Label labelError; 

     public PlayState State 
     { 
      get { return _currentState; } 
     } 

     public VideoDisplayControl() 
     { 
      components = new System.ComponentModel.Container(); 

      this.labelError = new System.Windows.Forms.Label(); 
      this.SuspendLayout(); 

      // Error label 
      this.labelError.BorderStyle = System.Windows.Forms.BorderStyle.None; 
      this.labelError.ForeColor = Color.DimGray; 
      this.labelError.Font = new System.Drawing.Font("Microsoft Sans Serif", 14.25F, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, ((byte)(0))); 
      this.labelError.Location = new System.Drawing.Point(0, 0); 
      this.labelError.Name = "labelError"; 
      this.labelError.Size = new System.Drawing.Size(50, 50); 
      this.labelError.TabIndex = 1; 
      this.labelError.Text = "Video Source Not Available"; 
      this.labelError.TextAlign = System.Drawing.ContentAlignment.MiddleCenter; 
      this.labelError.Visible = false; 

      this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font; 
//   System.Resources.ResourceManager resources = new System.Resources.ResourceManager(typeof(VideoDisplayControl)); 
      this.Controls.Add(this.labelError); 
      this.ResumeLayout(false); 
      this.PerformLayout(); 

      this.Load += new System.EventHandler(VideoDisplayControl_Load); 
     } 

     private void VideoDisplayControl_Load(object sender, System.EventArgs e) 
     { 
      this.Resize += new System.EventHandler(VideoDisplayControl_Resize); 
      CaptureVideo(); 
     } 

     private void VideoDisplayControl_Resize(object sender, System.EventArgs e) 
     { 
      if (this._videoWindow == null) 
       return; 

      // Attempt to keep aspect ratio of source 
      if (_imageAspectRatio > 0) 
      { 
       int width = Math.Min(this.Width, (int)(this.ClientSize.Height * _imageAspectRatio)); 
       int height = Math.Min(this.ClientSize.Height, (int)(this.Width/_imageAspectRatio)); 
       int posX = (this.Width - width)/2; // Center within control 
       int posY = (this.ClientSize.Height - height)/2; 
       this._videoWindow.SetWindowPosition(posX, posY, width, height); 
      } 
      else // resize to size of control 
       this._videoWindow.SetWindowPosition(0, 0, this.Width, this.ClientSize.Height); 

      this.labelError.Size = new System.Drawing.Size(this.Width, this.ClientSize.Height); 
     } 

     private void CaptureVideo() 
     { 
      int hr = 0; 
      IBaseFilter sourceFilter = null; 
      try 
      { 
       GetInterfaces(); // Interface with DirectShow 

       hr = _captureGraphBuilder.SetFiltergraph(_graphBuilder); 
       DsError.ThrowExceptionForHR(hr); 

       sourceFilter = FindCaptureDevice(); 

       hr = _graphBuilder.AddFilter(sourceFilter, "VideoDisplay Filter"); 
       DsError.ThrowExceptionForHR(hr); 

       hr = _captureGraphBuilder.RenderStream(PinCategory.Preview, MediaType.Video, sourceFilter, null, null); 
       Debug.WriteLine(DsError.GetErrorText(hr)); 
       DsError.ThrowExceptionForHR(hr); 

       Marshal.ReleaseComObject(sourceFilter); 

       SetupVideoWindow(); 

       hr = _mediaControl.Run(); 
       DsError.ThrowExceptionForHR(hr); 

       int width, height; 
       hr = _videoWindow.GetMaxIdealImageSize(out width, out height); 
       if ((hr == 0) && (width > 0) && (height > 0)) 
       { 
        _imageAspectRatio = (float)width/(float)height; 
        VideoDisplayControl_Resize(this, null); 
       } 

       _currentState = PlayState.Running; 
      } 
      catch (Exception) 
      { 
       _currentState = PlayState.Error; // Set error state 
       this.labelError.Visible = true; // Display the "video not available" label 
       VideoDisplayControl_Resize(this, null); // resize control to center label 
      } 
     } 

     private IBaseFilter FindCaptureDevice() 
     { 
      IEnumMoniker classEnum = null; 
      IMoniker[] moniker = new IMoniker[1]; 
      object source = null; 

      ICreateDevEnum devEnum = (ICreateDevEnum)(new CreateDevEnum()); 
      int hr = devEnum.CreateClassEnumerator(FilterCategory.VideoInputDevice, out classEnum, CDef.None); 
      DsError.ThrowExceptionForHR(hr); 
      Marshal.ReleaseComObject(devEnum); 

      if (classEnum == null) 
      { 
       throw new ApplicationException("No video capture device was detected.\\r\\n\\r\\n" + "This sample requires a video capture device, such as a USB WebCam,\\r\\nto be installed and working properly. The sample will now close."); 
      } 

      System.IntPtr none = System.IntPtr.Zero; 

      if (classEnum.Next(moniker.Length, moniker, none) == 0) 
      { 
       Guid iid = typeof(IBaseFilter).GUID; 
       moniker[0].BindToObject(null, null, ref iid, out source); 
      } 
      else 
      { 
       throw new ApplicationException("Unable to access video capture device!"); 
      } 

      Marshal.ReleaseComObject(moniker[0]); 
      Marshal.ReleaseComObject(classEnum); 

      return (IBaseFilter)source; 
     } 

     private void GetInterfaces() 
     { 
      _graphBuilder = (IGraphBuilder)(new FilterGraph()); 
      _captureGraphBuilder = (ICaptureGraphBuilder2)(new CaptureGraphBuilder2()); 
      _mediaControl = (IMediaControl)_graphBuilder; 
      _videoWindow = (IVideoWindow)_graphBuilder; 
      _mediaEventEx = (IMediaEventEx)_graphBuilder; 

      // send notification messages to the control window 
      int hr = _mediaEventEx.SetNotifyWindow(this.Handle, WM_GRAPHNOTIFY, IntPtr.Zero); 

      DsError.ThrowExceptionForHR(hr); 
     } 

     private void HandleGraphEvent() 
     { 
      int hr = 0; 
      EventCode evCode = 0; 
      IntPtr evParam1; 
      IntPtr evParam2; 

      while (this._mediaEventEx != null && _mediaEventEx.GetEvent(out evCode, out evParam1, out evParam2, 0) == 0) 
      { 
       // Free event parameters to prevent memory leaks associated with 
       // event parameter data. While this application is not interested 
       // in the received events, applications should always process them. 
       hr = _mediaEventEx.FreeEventParams(evCode, evParam1, evParam2); 
       DsError.ThrowExceptionForHR(hr); 

       // Insert event processing code here, if desired (see http://msdn2.microsoft.com/en-us/library/ms783649.aspx) 
      } 
     } 

     private void ReleaseInterfaces() 
     { 
      if (this._mediaControl != null) 
       this._mediaControl.StopWhenReady(); 

      this._currentState = PlayState.Stopped; 

      // stop notifications of events 
      if (this._mediaEventEx != null) 
       this._mediaEventEx.SetNotifyWindow(IntPtr.Zero, WM_GRAPHNOTIFY, IntPtr.Zero); 

      //// Relinquish ownership (IMPORTANT!) of the video window. 
      //// Failing to call put_Owner can lead to assert failures within 
      //// the video renderer, as it still assumes that it has a valid 
      //// parent window. 
      if (this._videoWindow != null) 
      { 
       this._videoWindow.put_Visible(OABool.False); 
       this._videoWindow.put_Owner(IntPtr.Zero); 
      } 

      // Release DirectShow interfaces 
      Marshal.ReleaseComObject(this._mediaControl); 
      this._mediaControl = null; 

      Marshal.ReleaseComObject(this._mediaEventEx); 
      this._mediaEventEx = null; 

      Marshal.ReleaseComObject(this._videoWindow); 
      this._videoWindow = null; 

      Marshal.ReleaseComObject(this._graphBuilder); 
      this._graphBuilder = null; 

      Marshal.ReleaseComObject(this._captureGraphBuilder); 
      this._captureGraphBuilder = null; 
     } 

     private void SetupVideoWindow() 
     { 
      int hr = 0; 

      //set the video window to be a child of the main window 
      //putowner : Sets the owning parent window for the video playback window. 
      hr = _videoWindow.put_Owner(this.Handle); 
      DsError.ThrowExceptionForHR(hr); 

      hr = _videoWindow.put_WindowStyle(WindowStyle.Child | WindowStyle.ClipChildren); 
      DsError.ThrowExceptionForHR(hr); 

      //Use helper function to position video window in client rect of main application window 
      VideoDisplayControl_Resize(this, null); 

      //Make the video window visible, now that it is properly positioned 
      //put_visible : This method changes the visibility of the video window. 
      hr = _videoWindow.put_Visible(OABool.True); 
      DsError.ThrowExceptionForHR(hr); 
     } 

     protected override void WndProc(ref Message m) 
     { 
      if (m.Msg == WM_GRAPHNOTIFY) 
      { 
       HandleGraphEvent(); 
      } 
      if (_videoWindow != null) 
      { 
       _videoWindow.NotifyOwnerMessage(m.HWnd, m.Msg, m.WParam, m.LParam); 
      } 
      base.WndProc(ref m); 
     } 
    } 
} 

Answer 1

これは、インターレースの問題であることが判明しました。カメラはインターレースビデオを出力していましたが、キャプチャカードはインターレース解除されていませんでした。私はvid capカードドライバのde-interlacingを有効にして、すべてうまくいきます。これはキャプチャカードのメーカー、Osprey（Viewcast）によって提案されました。