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StartConvert Method

Summary

Starts converting data.

Syntax

C++/CLI

public virtual void StartConvert()

public: 
virtual void StartConvert();

Remarks

Places the object in the ConvertState.Running state. If the method fails, an error is raised. For more information, refer to the Error Codes. This method can block for a long time when streaming from the LEAD RTSP Source filter. If the LEAD RTSP Source filter is not receiving data, the MediaEvent event will be fired every second. The event will have eventCode set to MediaEventCode.EC_LOADSTATUS and param1 will be set to LoadStatusEventCode.AM_LOADSTATUS_WAITING_FOR_DATA. See the MediaEventCode enumeration for more details. Abort the wait for data by calling ConvertCtrl.ResetSource or ConvertCtrl.StopConvert while processing the event. See LoadStatusEventCode for more details.

Example

using Leadtools; 
using Leadtools.Multimedia; 
using LeadtoolsMultimediaExamples.Fixtures; 
 
 
public bool _result = false; 
public ConvertCtrlForm _form = new ConvertCtrlForm(); 
public ConvertCtrl _convertctrl; 
public bool _paused = false; 
public int _percent = 0; 
 
public void ConvertExample() 
{ 
   // 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_ConvertExample.avi"); 
 
   try 
   { 
      // set the source for conversion 
      _convertctrl.SourceFile = inFile; 
 
      // set the video and audio compressors 
      _convertctrl.VideoCompressors.Mpeg2.Selected = true; 
      _convertctrl.AudioCompressors.AC3.Selected = true; 
 
      // set the target output file and format 
      _convertctrl.TargetFile = outFile; 
 
      // set the target output format 
      _convertctrl.TargetFormat = TargetFormatType.AVI; 
 
      // if the source has a non-zero duration, convert it 
      if (_convertctrl.Duration > 0) 
      { 
         // set the selected area for conversion 
         _convertctrl.SelectionStart = 10; 
         _convertctrl.SelectionEnd = 20; 
 
         // subscribe to the progress event 
         _convertctrl.Progress += new ProgressEventHandler(ConvertCtrl_Progress); 
 
         // start the capture process 
         _convertctrl.StartConvert(); 
 
         // set a timer on our form to do something 
         _form.TestTimer.Tick += new EventHandler(TestTimer_Tick); 
         _form.TestTimer.Interval = 1000; 
         _form.TestTimer.Start(); 
 
         // 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 
            || _convertctrl.State == ConvertState.Paused) 
            Application.DoEvents(); 
      } 
      _result = true; 
   } 
   catch (Exception) 
   { 
      _result = false; 
   } 
} 
 
void ConvertCtrl_Progress(object sender, ProgressEventArgs e) 
{ 
   if (_convertctrl.PercentComplete > 30) 
   { 
      // set percentage scalar to 1 
      _convertctrl.PercentCompleteScalar = 1; 
 
      // get the percentage complete 
      _percent = _convertctrl.PercentComplete; 
 
      // pause the conversion to demonstrate pausing 
      _convertctrl.PauseConvert(); 
      _paused = true; 
   } 
} 
 
void TestTimer_Tick(object sender, EventArgs e) 
{ 
   _form.TestTimer.Stop(); 
 
   if (_paused) 
   { 
      // if we are paused, resume  
      if (_convertctrl.State == ConvertState.Paused) 
      { 
         // resume the conversion 
         _convertctrl.RunConvert(); 
 
         // set the result 
         _result = true; 
         _paused = false; 
      } 
   } 
 
   _form.TestTimer.Start(); 
} 
 
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.Multimedia Assembly

Introduction

Getting Started

Namespaces

Leadtools.Multimedia Namespace

Leadtools.Multimedia.Common Namespace

Assemblies