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EstimateOutputSize Method

Summary

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

Syntax

C++/CLI

public virtual double EstimateOutputSize( 
   double duration 
)

public: 
virtual double EstimateOutputSize(  
   double duration 
)

Parameters

duration
Value that represents the duration in seconds for which to calculate the estimated output size. Pass the value -1 to estimate the conversion output size for the whole 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 chosen encoding settings.

Example

using Leadtools; 
using Leadtools.MediaFoundation; 
using LeadtoolsMediaFoundationExamples.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.MP4"); 
 
   try 
   { 
      // set the source video 
      _convertctrl.SourceFile = inFile; 
 
      // select MP4 target format 
      _convertctrl.TargetFormat = TargetFormatType.MP4; 
 
      // select H264 video target format 
      int index = -1; 
      TargetVideoFormats targetvideoformats = _convertctrl.TargetFormats[_convertctrl.TargetFormat].VideoFormats; 
      index = targetvideoformats.IndexOf("{34363248-0000-0010-8000-00AA00389B71}");// H264 
      targetvideoformats.Selection = index; 
 
      // select AAC audio target format 
      TargetAudioFormats targetaudioformats = _convertctrl.TargetFormats[_convertctrl.TargetFormat].AudioFormats; 
      index = targetaudioformats.IndexOf("{00001610-0000-0010-8000-00AA00389B71}");// AAC 
      targetaudioformats.Selection = index; 
 
      // 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:\LEADTOOLS23\Media"; 
}

Requirements

Target Platforms

Reference

ConvertCtrl Class

ConvertCtrl Members

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Help Version 23.0.2024.2.29

Leadtools.MediaFoundation Assembly

Introduction

Getting Started

Namespaces

Leadtools.MediaFoundation Namespace

Leadtools.MediaFoundation.Common Namespace

Assemblies