DroppedFrames Property


Gets the total number of frames that have been dropped during capture.

public virtual int DroppedFrames { get; } 
Public Overridable ReadOnly Property DroppedFrames As Integer 
virtual property int DroppedFrames { 
   int get(); 

Property Value

A value representing the number of dropped frames.


The value is reset to zero when a new capture begins.

using Leadtools; 
using Leadtools.Multimedia; 
using LeadtoolsMultimediaExamples.Fixtures; 
public bool _result = false; 
public CaptureCtrlForm _form = new CaptureCtrlForm(); 
// capture control 
CaptureCtrl capturectrl; 
// output file 
string outFile = Path.Combine(LEAD_VARS.MediaDir, "CaptureCtrl_DroppedFramesExample.avi"); 
public void DroppedFramesExample() 
   // reference the capture control 
   capturectrl = _form.CaptureCtrl; 
   // dropped frames 
   int DroppedFrames; 
      // set the source video device. use your device's name here 
      if (capturectrl.VideoDevices["USB"] == null) 
         throw new Exception("No USB video device available"); 
      capturectrl.VideoDevices["USB"].Selected = true; 
      // select a video compressor 
      capturectrl.VideoCompressors.Mpeg4.Selected = true; 
      // set the target output file 
      capturectrl.TargetFile = outFile; 
      // subscribe to the started event 
      capturectrl.Started += new System.EventHandler(CaptureCtrl_Started); 
      // start capture 
      // get dropped frames 
      DroppedFrames = capturectrl.DroppedFrames; 
      // set the result to what we expect 
      _result = (DroppedFrames >= 0); 
   catch (COMException) 
      _result = false; 
   catch (Exception) 
      _result = false; 
void CaptureCtrl_Started(object sender, EventArgs e) 
   // stop the capture (we do not need a complete capture for this example) 
static class LEAD_VARS 
   public const string MediaDir = @"C:\Program Files (x86)\LEAD Technologies\LEADTOOLS 20\Media"; 
Imports Leadtools 
Imports Leadtools.Multimedia 
Imports LeadtoolsMultimediaExamples.Fixtures 
Public _result As Boolean = False 
Public _form As CaptureCtrlForm = New CaptureCtrlForm() 
Public _capturectrl As CaptureCtrl 
Public Sub DroppedFramesExample() 
   ' reference the capture control 
   _capturectrl = _form.CaptureCtrl 
   ' output file 
   Dim outFile As String = Path.Combine(LEAD_VARS.MediaDir, "CaptureCtrl_DroppedFramesExample.avi") 
   ' dropped frames 
   Dim DroppedFrames As Integer 
      ' set the source video device, select using your device name here 
      If _capturectrl.VideoDevices("USB") Is Nothing Then 
         Throw New Exception("No USB video device available") 
      End If 
      _capturectrl.VideoDevices("USB").Selected = True 
      ' select a video compressor 
      _capturectrl.VideoCompressors.Mpeg4.Selected = True 
      ' set the target output file 
      _capturectrl.TargetFile = outFile 
      ' subscribe to the started event 
      AddHandler _capturectrl.Started, AddressOf CaptureCtrl_Started 
      ' start capture 
      ' get dropped frames 
      DroppedFrames = _capturectrl.DroppedFrames 
      ' set the result to what we expect 
      _result = (DroppedFrames >= 0) 
   Catch e1 As Exception 
      _result = False 
   End Try 
   ' we'll loop on the state and pump messages for this example. 
   ' but you should not need to if running from a Windows Forms application. 
   Do While _capturectrl.State = CaptureState.Running 
End Sub 
Private Sub CaptureCtrl_Started(ByVal sender As Object, ByVal e As EventArgs) 
   ' stop the capture (we don't need a complete capture for this example) 
End Sub 
Public NotInheritable Class LEAD_VARS 
   Public Const MediaDir As String = "C:\Program Files (x86)\LEAD Technologies\LEADTOOLS 20\Media" 
End Class 


Target Platforms

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