EstimateOutputSize Method (CaptureCtrl)

Visual Basic
C#
C++/CLI

'Declaration
 
Public Overridable Function EstimateOutputSize( _
   ByVal duration As Double _
) As Double

'Usage
 
Dim instance As CaptureCtrl
Dim duration As Double
Dim value As Double
 
value = instance.EstimateOutputSize(duration)

public virtual double EstimateOutputSize( 
   double duration
)

public:
virtual double EstimateOutputSize( 
   double duration
)

Parameters

duration: A System.Double that represents the duration, in seconds, used to calculate the estimated output size.

Return Value

estimated captured object output size, in bytes.

The estimated output size is calculated using the following equation: Size = (Bitrate * Duration) / 8.

The retrieved size depends on the state of the capture object. If the object is in the running state, the retrieved size is related to the actual number of bytes that have been written. If the object is not running, the retrieved size is a theoretical value dependent on the capturing settings and the chosen encoding settings.

Visual Basic
C#
WinRT C#
WinRT JavaScript
Silverlight C#
Silverlight VB

Copy Code

Imports Leadtools
Imports Leadtools.MediaFoundation
Imports LeadtoolsMediaFoundationExamples.Fixtures

Public _result As Boolean = False
Public _form As New CaptureCtrlForm()
Public _capturectrl As CaptureCtrl
Public Sub EstimateExample()
    ' reference the capture control
    _capturectrl = _form.CaptureCtrl

    ' output file 
    Dim outFile As String = Path.Combine(LEAD_VARS.MediaDir, "CaptureCtrl_EstimateOutputBitRateExample.avi")

    ' set the video capture device, use your capture 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

    Try
        ' set the capture target file
        _capturectrl.TargetFile = outFile

        ' set the capture mode to still and start
        _capturectrl.ReadyCapture(CaptureMode.Video Or CaptureMode.InhibitRun)

        ' get the bit rate estimate
        Dim bitRate As Integer = _capturectrl.EstimateOutputBitRate()

        ' get file size estimate for 60 secs
        Dim fileSize As Double = _capturectrl.EstimateOutputSize(60.0)

        ' set the result to what we expect
        _result = (bitRate <> 0 AndAlso fileSize <> 0.0)
    Catch generatedExceptionName As Exception
        _result = False
    End Try
End Sub

Public NotInheritable Class LEAD_VARS
Public Const MediaDir As String = "C:\Program Files (x86)\LEAD Technologies\LEADTOOLS 18\Media"
End Class

using Leadtools;
using Leadtools.MediaFoundation;
using LeadtoolsMediaFoundationExamples.Fixtures;

public bool _result = false;
public CaptureCtrlForm _form = new CaptureCtrlForm();
public CaptureCtrl _capturectrl;
public void EstimateExample()
{
   // reference the capture control
   _capturectrl = _form.CaptureCtrl;

   // output file 
   string outFile = Path.Combine(LEAD_VARS.MediaDir,"CaptureCtrl_EstimateOutputBitRateExample.avi");

   // set the video capture device, use your capture device name here
   if (_capturectrl.VideoDevices["USB"] == null)
      throw new Exception("No USB video device available");

   _capturectrl.VideoDevices["USB"].Selected = true;

   try
   {
      // set the capture target file
      _capturectrl.TargetFile = outFile;

      // set the capture mode to still and start
      _capturectrl.ReadyCapture(CaptureMode.Video | CaptureMode.InhibitRun);

      // get the bit rate estimate
      int bitRate = _capturectrl.EstimateOutputBitRate();

      // get file size estimate for 60 secs
      double fileSize = _capturectrl.EstimateOutputSize(60.0);

      // set the result to what we expect
      _result = (bitRate != 0 && fileSize != 0.0);
   }
   catch (Exception)
   {
      _result = false;
   }
}

static class LEAD_VARS
{
public const string MediaDir = @"C:\Program Files (x86)\LEAD Technologies\LEADTOOLS 18\Media";
}

Target Platforms

Reference

CaptureCtrl Class
CaptureCtrl Members