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EstimateOutputSize Method

Summary

Gets the estimated conversion output size for the specified duration, in bytes.

Syntax

C++

public virtual double EstimateOutputSize( 
   double duration 
)

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

public: 
virtual double EstimateOutputSize(  
   double duration 
)

Parameters

duration
Value that represents the duration in seconds for which to calculate the estimated output size. Pass -1 to estimate the conversion output size for the entire file duration.

Return Value

A value that represents the conversion estimated output size.

Remarks

The estimated output size is calculated using the following equation: Size = (Bitrate * Duration) / 8. The retrieved size depends on the state of the convert 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 conversion settings and the selected encoding settings.

Example

using Leadtools; 
using Leadtools.Multimedia; 
using LeadtoolsMultimediaExamples.Fixtures; 
 
public bool _result = false; 
public ConvertCtrlForm _form = new ConvertCtrlForm(); 
public ConvertCtrl _convertctrl; 
public int _estBitRate = 0; 
public double _estFileSize = 0.0; 
 
public void EstimateExample() 
{ 
   // reference the convert control 
   _convertctrl = _form.ConvertCtrl; 
 
   // input and output files 
   string inFile = Path.Combine(LEAD_VARS.MediaDir, "ConvertCtrl_Source.avi"); 
   string outFile = Path.Combine(LEAD_VARS.MediaDir, "ConvertCtrl_EstimateOutputBitRateExample.avi"); 
 
   try 
   { 
      // set the source video 
      _convertctrl.SourceFile = inFile; 
 
      // set video and audio compressors 
      _convertctrl.VideoCompressors.H264.Selected = true; 
      _convertctrl.AudioCompressors.AC3.Selected = true; 
 
      // subscribe to the progress event 
      _convertctrl.Progress += new ProgressEventHandler(ConvertCtrl_Progress); 
 
      // set the capture target file 
      _convertctrl.TargetFile = outFile; 
 
      // set the capture mode to still and start 
      _convertctrl.StartConvert(); 
 
      // 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. 
      while (_convertctrl.State == ConvertState.Running) 
         Application.DoEvents(); 
 
      // set the result to what we expect 
      _result = (_estBitRate != 0 && _estFileSize != 0.0); 
   } 
   catch (Exception) 
   { 
      _result = false; 
   } 
} 
 
void ConvertCtrl_Progress(object sender, ProgressEventArgs e) 
{ 
   // get the bit rate estimate 
   // we will get called multiple time throughout the conversion process 
   // but for this example it is ok just to use the last received estimate 
   _estBitRate = _convertctrl.EstimateOutputBitRate(); 
 
   // get the file size estimate 
   _estFileSize = _convertctrl.EstimateOutputSize((double)e.time); 
} 
 
static class LEAD_VARS 
{ 
   public const string MediaDir = @"C:\LEADTOOLS21\Media"; 
}

Imports Leadtools 
Imports Leadtools.Multimedia 
Imports LeadtoolsMultimediaExamples.Fixtures 
 
Public _result As Boolean = False 
Public _form As ConvertCtrlForm = New ConvertCtrlForm() 
Public _convertctrl As ConvertCtrl 
Public _estBitRate As Integer = 0 
Public _estFileSize As Double = 0.0 
 
Public Sub EstimateExample() 
   ' reference the convert control 
   _convertctrl = _form.ConvertCtrl 
 
   ' input and output files 
   Dim inFile As String = Path.Combine(LEAD_VARS.MediaDir, "ConvertCtrl_Source.avi") 
   Dim outFile As String = Path.Combine(LEAD_VARS.MediaDir, "ConvertCtrl_EstimateOutputBitRateExample.avi") 
 
   Try 
      ' set the source video 
      _convertctrl.SourceFile = inFile 
 
      ' set video and audio compressors 
      _convertctrl.VideoCompressors.H264.Selected = True 
      _convertctrl.AudioCompressors.AC3.Selected = True 
 
      ' subscribe to the progress event 
      AddHandler _convertctrl.Progress, AddressOf ConvertCtrl_Progress 
 
      ' set the capture target file 
      _convertctrl.TargetFile = outFile 
 
      ' set the capture mode to still and start 
      _convertctrl.StartConvert() 
 
      ' 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 _convertctrl.State = ConvertState.Running 
         Application.DoEvents() 
      Loop 
 
      ' set the result to what we expect 
      _result = (_estBitRate <> 0 AndAlso _estFileSize <> 0.0) 
   Catch e1 As Exception 
      _result = False 
   End Try 
End Sub 
 
Private Sub ConvertCtrl_Progress(ByVal sender As Object, ByVal e As ProgressEventArgs) 
   ' get the bit rate estimate 
   ' we will get called multiple times throughout the conversion process 
   ' but for this example it is ok just to use the last received estimate 
   _estBitRate = _convertctrl.EstimateOutputBitRate() 
 
   ' get the file size estimate 
   _estFileSize = _convertctrl.EstimateOutputSize(CDbl(e.time)) 
End Sub 
 
Public NotInheritable Class LEAD_VARS 
   Public Const MediaDir As String = "C:\LEADTOOLS21\Media" 
End Class

Requirements

Target Platforms

Reference

ConvertCtrl Class

ConvertCtrl Members

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Help Version 21.0.2021.7.2

Leadtools.Multimedia Assembly

Introduction

Getting Started

Namespaces

Leadtools.Multimedia Namespace

Leadtools.Multimedia.Common Namespace

Assemblies