StartConvert Method

Summary

Starts converting data.

Syntax
C#
VB
C++
public virtual void StartConvert() 
Public Overridable Sub 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
C#
VB
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(); 
      } 
   } 
   catch (Exception) 
   { 
      _result = false; 
   } 
} 
 
void ConvertCtrl_Progress(object sender, ProgressEventArgs e) 
{ 
   if (_convertctrl.PercentComplete > 30) 
   { 
      // 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:\Program Files (x86)\LEAD Technologies\LEADTOOLS 20\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 _paused As Boolean = False 
Public _percent As Integer = 0 
 
Public Sub ConvertExample() 
   ' 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_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 Then 
         ' set the selected area for conversion 
         _convertctrl.SelectionStart = 10 
         _convertctrl.SelectionEnd = 20 
 
         ' subscribe to the progress event 
         AddHandler _convertctrl.Progress, AddressOf ConvertCtrl_Progress 
 
         ' start the capture process 
         _convertctrl.StartConvert() 
 
         ' set a timer on our form to do something 
         AddHandler _form.TestTimer.Tick, AddressOf 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. 
         Do While _convertctrl.State = ConvertState.Running OrElse _convertctrl.State = ConvertState.Paused 
            Application.DoEvents() 
         Loop 
      End If 
   Catch e1 As Exception 
      _result = False 
   End Try 
End Sub 
 
Private Sub ConvertCtrl_Progress(ByVal sender As Object, ByVal e As ProgressEventArgs) 
   If _convertctrl.PercentComplete > 30 Then 
      ' get the percentage complete 
      _percent = _convertctrl.PercentComplete 
 
      ' pause the conversion to demonstrate pausing 
      _convertctrl.PauseConvert() 
      _paused = True 
   End If 
End Sub 
 
Private Sub TestTimer_Tick(ByVal sender As Object, ByVal e As EventArgs) 
   _form.TestTimer.Stop() 
 
   If _paused Then 
      ' if we are paused, resume  
      If _convertctrl.State = ConvertState.Paused Then 
         ' resume the conversion 
         _convertctrl.RunConvert() 
 
         ' set the result 
         _result = True 
         _paused = False 
      End If 
   End If 
 
   _form.TestTimer.Start() 
End Sub 
 
Public NotInheritable Class LEAD_VARS 
   Public Const MediaDir As String = "C:\Program Files (x86)\LEAD Technologies\LEADTOOLS 20\Media" 
End Class 
Requirements

Target Platforms

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Leadtools.Multimedia Assembly