StartConvert Method

C#
Visual Basic
Objective-C
Java
C++

public virtual void StartConvert()

'Declaration

Public Overridable Sub StartConvert()

'Usage

Dim instance As ConvertCtrl
 
instance.StartConvert()

public:
virtual void StartConvert();

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.

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

Copy Code

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 19\Media"
End Class

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 19\Media";
}

Target Platforms

Reference

ConvertCtrl Class
ConvertCtrl Members