Creating a LEADTOOLS Multimedia Concatenate Video Application

Perform the following steps to create and run a multimedia convert application to concatenate two video files using two LEADTOOLS Multimedia ConvertCtrl controls.

Start Visual Studio.
Choose File->New->Project... from the menu.
In the New Project dialog box, choose either "Visual C# Projects" or "VB Projects" in the Projects Type List, and choose "Windows Application " in the Templates List.
Type the project name as "Multimedia Concatenate Videos" in the Project Name field, and then click OK. If desired, type a new location for your project or select a directory using the Browse button, and then click OK.
In the "Solution Explorer" window, right-click the "References" folder, and select "Add Reference..." from the context menu. In the "Add Reference" dialog box, select the ".NET" tab and select Leadtools.Multimedia and click OK. Also, right-click the "References" folder, and select "Add Reference..." from the context menu. In the "Add Reference" dialog box, select the "COM" tab and select:
- LEAD MPEG-2 Transport Multiplexer Library
- LEAD MPEG-2 Transport Demultiplexer Library
Note: The above COM objects must be registered; in case they were not; using regsvr32. For more information, refer to DirectShow Registry-free Activation.

Next click OK.
Make sure Form1 is in design view. Go to the toolbox (View->Toolbox) and drag two ConvertCtrl controls on the form. NOTE: If you do not have ConvertCtrl control in your toolbox, select Tools->Choose Toolbox Items from the menu. Click Browse and then select Leadtools.Multimedia.dll from "<LEADTOOLS_INSTALLDIR>\Bin\Dotnet4\Win32" and then click Open and then click OK. After adding these controls to the form, set the following properties:

Property Value

Name _convertctrl1

Name _convertctrl2

Property	Value
Name	_convertctrl1
Name	_convertctrl2

Go to the toolbox (View->Toolbox) and drag a ProgressBar control on the form (below the convert control) and set the following properties:

Property	Value
Name	_progress
Anchor	Bottom, Left, Right
Step	1

Go to the toolbox (View->Toolbox) and drag two Button controls to the bottom of the form and set the following properties:

Property	Value
Name	_buttonProcessor
Text	Processor...
Anchor	Bottom, Right
Name	_buttonConvert
Text	Convert
Anchor	Bottom, Right

Switch Form1 to code view (right-click Form1 in the Solution Explorer then choose View Code) and add the following lines to the beginning of the file:
VB
```
Imports Leadtools.Multimedia 
```
C#
```
using Leadtools.Multimedia; 
```

Declare the following private variable:

Private _sourceFile1 As String 
Private _sourceFile2 As String 
Private _targetFile As String

private string _sourceFile1; 
private string _sourceFile2; 
private string _targetFile;

Add an event handler to the _convertctrl2 Progress event and code it as follows:

Private Sub _convertctrl2_Progress(ByVal sender As System.Object, ByVal e As ProgressEventArgs) Handles _convertctrl2.Progress 
   _progress.Value = CInt((_progress.Maximum * e.percent / 100)) 
End Sub

private void _convertctrl2_Progress(object sender, ProgressEventArgs e) 
{ 
   _progress.Value = (int)(_progress.Maximum * e.percent / 100); 
}

Add an event handler to the _convertctrl2 Complete event and code it as follows:

Private Sub _convertctrl2_Complete(ByVal sender As System.Object, ByVal e As EventArgs) Handles _convertctrl2.Complete 
   MessageBox.Show("Concatenation Complete") 
   _buttonConvert.Enabled = True 
End Sub

private void _convertctrl2_Complete(object sender, EventArgs e) 
{ 
   MessageBox.Show("Concatenation Complete"); 
   _buttonConvert.Enabled = true; 
}

Add an event handler to the _buttonConvert Click event and code it as follows:

Private Sub _buttonConvert_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles _buttonConvert.Click 
 Dim pConvert1 As ConvertCtrl = _convertctrl1 
 Dim pConvert2 As ConvertCtrl = _convertctrl2 
 Dim pMSSource As MultiStreamSource 
 Dim pMSTarget As MultiStreamTarget 
 Dim lStart As Int64 
                 
 Dim pmt As MediaType 
 Dim pInsertedMediaType As MediaType 
                 
 pMSSource = New MultiStreamSource() 
 pMSTarget = New MultiStreamTarget() 
                 
 ' set the start time to be 0 
 lStart = 0 
                 
 ' set the input filename 
 pConvert1.SourceFile = _sourceFile1 
                 
 ' set the output sample to a target object 
 pMSTarget.StreamCount = 2 
                 
 ' set the target media types for video and audio streams 
 pmt = New MediaType() 
  pmt.Type = Leadtools.Multimedia.Constants.MEDIATYPE_Video 
  pMSTarget.SetAcceptedMediaType(0, pmt) 
                 
  pmt.Type = Leadtools.Multimedia.Constants.MEDIATYPE_Audio 
 pMSTarget.SetAcceptedMediaType(1, pmt) 
                 
 pmt = Nothing 
                 
 ' get the inserted media type for the first stream 
 pInsertedMediaType = pMSTarget.GetAcceptedMediaType(0) 
 pInsertedMediaType = Nothing 
                 
 ' set convert 1 target object 
 pConvert1.TargetObject = pMSTarget 
                 
 ' start the source conversion, so we can get the media sample format 
 pConvert1.StartConvert() 
                 
 ' initialize convert 2 
 ' get the output media sample format and put it into the source object 
 pMSSource.StreamCount = 2 
 pmt = pMSTarget.GetConnectedMediaType(0) 
 pMSSource.SetMediaType(0, pmt) 
 pmt = Nothing 
                 
 pmt = pMSTarget.GetConnectedMediaType(1) 
 pMSSource.SetMediaType(1, pmt) 
 pmt = Nothing 
                 
 ' get the inserted media type for the first stream 
 pInsertedMediaType = pMSSource.GetMediaType(0) 
 pInsertedMediaType = Nothing 
                 
 ' set the output filename 
 pConvert2.TargetFile = _targetFile 
                 
 ' set the source for convert 2 
 pConvert2.SourceObject = pMSSource 
                 
 ' start the dest conversion 
 pConvert2.StartConvert() 
                 
 ' convert first file 
 ConcateFile(pConvert1, pMSTarget, pMSSource, lStart) 
                 
 ' 
 'Restrict the output format to the media type of the source for the first file 
 'That is because the two files must have the same media type for both video and audio 
 'With video, you have to make sure the files have the same frame rate! Minor changes in 
 'the frame rate might make the connection fail! 
 'The control will tolerate differences in frame rate if you comment the next line 
 ' 
                 
 pmt = pMSTarget.GetConnectedMediaType(0) 
 pMSTarget.SetAcceptedMediaType(0, pmt) 
 pmt = Nothing 
                 
 pmt = pMSTarget.GetConnectedMediaType(1) 
 pMSTarget.SetAcceptedMediaType(1, pmt) 
 pmt = Nothing 
                 
 ' change the source file to second file 
 pConvert1.SourceFile = _sourceFile2 
                 
 ' start converting again 
 pConvert1.StartConvert() 
                 
 ' convert second file 
 ConcateFile(pConvert1, pMSTarget, pMSSource, lStart) 
                 
 ' deliver end of sample to stop the conversion 
 pMSSource.DeliverEndOfStream(0, 1000) 
 pMSSource.DeliverEndOfStream(1, 1000) 
                 
 If pConvert2.State = ConvertState.Running Then 
    pConvert2.StopConvert() 
 End If 
                 
 ' free the source and target objects 
 pConvert2.ResetSource() 
 pConvert1.ResetTarget() 
                 
 pMSSource.Dispose() 
 pMSTarget.Dispose() 
End Sub

private void _buttonConvert_Click(object sender, System.EventArgs e) 
{ 
   ConvertCtrl pConvert1 = _convertctrl1; 
   ConvertCtrl pConvert2 = _convertctrl2; 
   MultiStreamSource pMSSource; 
   MultiStreamTarget pMSTarget; 
   Int64 lStart; 
                 
   MediaType   pmt; 
   MediaType   pInsertedMediaType; 
                 
   pMSSource = new MultiStreamSource(); 
   pMSTarget = new MultiStreamTarget(); 
                 
   // set the start time to be 0 
   lStart = 0; 
                 
   // set the input filename 
   pConvert1.SourceFile = _sourceFile1; 
                 
   // set the output sample to a target object 
   pMSTarget.StreamCount = 2; 
                 
   // set the target media types for video and audio streams 
   pmt = new MediaType(); 
   pmt.Type = Constants.MEDIATYPE_Video; 
   pMSTarget.SetAcceptedMediaType(0, pmt); 
                 
   pmt.Type = Constants.MEDIATYPE_Audio; 
   pMSTarget.SetAcceptedMediaType(1, pmt); 
                 
   pmt = null; 
                 
   // get the inserted media type for the first stream 
   pInsertedMediaType = pMSTarget.GetAcceptedMediaType(0); 
   pInsertedMediaType = null; 
                 
   // set convert 1 target object 
   pConvert1.TargetObject = pMSTarget; 
                 
   // start the source conversion, so we can get the media sample format 
   pConvert1.StartConvert(); 
                 
   // initialize convert 2 
   // get the output media sample format and put it into the source object 
   pMSSource.StreamCount = 2; 
   pmt = pMSTarget.GetConnectedMediaType(0); 
   pMSSource.SetMediaType(0, pmt); 
   pmt = null; 
                 
   pmt = pMSTarget.GetConnectedMediaType(1); 
   pMSSource.SetMediaType(1, pmt); 
   pmt = null; 
                 
   // get the inserted media type for the first stream 
   pInsertedMediaType = pMSSource.GetMediaType(0); 
   pInsertedMediaType = null; 
                 
   // set the output filename 
   pConvert2.TargetFile = _targetFile; 
                 
   // set the source for convert 2 
   pConvert2.SourceObject = pMSSource; 
                 
   // start the destination conversion 
   pConvert2.StartConvert(); 
                 
   // convert first file 
   ConcateFile(pConvert1, pMSTarget, pMSSource, ref lStart); 
                 
   /* 
   Restrict the output format to the media type of the source for the first file 
   That is because the two files must have the same media type for both video and audio 
   With video, you have to make sure the files have the same frame rate! Minor changes in 
   the frame rate might make the connection fail! 
   The control will tolerate differences in frame rate if you comment the next line 
   */ 
                 
   pmt = pMSTarget.GetConnectedMediaType(0); 
   pMSTarget.SetAcceptedMediaType(0, pmt); 
   pmt = null; 
                 
   pmt = pMSTarget.GetConnectedMediaType(1); 
   pMSTarget.SetAcceptedMediaType(1, pmt); 
   pmt = null; 
                 
   // change the source file to second file 
   pConvert1.SourceFile = _sourceFile2; 
                 
   // start converting again 
   pConvert1.StartConvert(); 
                 
   // convert second file 
   ConcateFile(pConvert1, pMSTarget, pMSSource, ref lStart); 
                 
   // deliver end of sample to stop the conversion 
   pMSSource.DeliverEndOfStream(0, 1000); 
   pMSSource.DeliverEndOfStream(1, 1000); 
                 
   if (pConvert2.State == ConvertState.Running) 
      pConvert2.StopConvert(); 
                 
   // free the source and target objects 
   pConvert2.ResetSource(); 
   pConvert1.ResetTarget(); 
                 
   pMSSource.Dispose(); 
   pMSTarget.Dispose(); 
}

Add the following helper methods for the concatenation work:

Private Sub ConcateFile(ByVal pConvert1 As ConvertCtrl, ByVal pMSTarget As MultiStreamTarget, ByVal pMSSource As MultiStreamSource, ByRef lStart As Long) 
 Dim pmsSrc As MediaSample = Nothing 
 Dim pmsDst As MediaSample = Nothing 
 Dim MediaTimeStart As Long 
 Dim MediaTimeStop As Long 
 Dim LastStart As Long 
 Dim LastStop As Long 
 Dim lSampleStream As Integer 
 Dim lActualDataLength As Integer 
                 
  LastStop = 0 
                 
 Do 
    ' get the sample, allowing 10 s for the operation to complete 
    Try 
     lSampleStream = pMSTarget.WaitForSample(1000) 
    Catch cex As COMException 
     If cex.ErrorCode = CInt(ErrorCode.VFW_E_TIMEOUT) Then 
      ' end of the stream 
      Exit Do 
     End If 
     Exit Do 
    End Try 
    Try 
       ' get the target sample 
     pmsSrc = pMSTarget.GetSample(lSampleStream, 0) 
     ' get the source buffer 
     pmsDst = pMSSource.GetSampleBuffer(lSampleStream, 2000) 
    Catch e1 As Exception 
     Exit Do 
    End Try 
                 
    ' get the media time 
    pmsSrc.GetMediaTime(MediaTimeStart, MediaTimeStop) 
                 
    ' get the source sample time 
    pmsSrc.GetTime(LastStart, LastStop) 
                 
    ' set the destination sample time 
    pmsDst.SetTime(lStart + LastStart, lStart + LastStop) 
                 
    ' copy the data 
    lActualDataLength = pmsSrc.ActualDataLength 
                 
    ' set the destination buffer  
    ' we could Marshal the unmanaged buffer here, but no need since we are merely  
    ' setting the destination to the source buffer contents (unaltered data) 
    pmsDst.SetData(lActualDataLength, pmsSrc.GetData(lActualDataLength)) 
                 
    ' copy the other flags 
    pmsDst.Discontinuity = pmsSrc.Discontinuity 
    pmsDst.Preroll = pmsSrc.Preroll 
    pmsDst.SyncPoint = pmsSrc.SyncPoint 
                 
    ' release the source sample 
    pmsSrc = Nothing 
                 
    ' deliver the destination sample 
    pMSSource.DeliverSample(lSampleStream, 1000, pmsDst) 
                 
    ' release the destination sample 
    pmsDst = Nothing 
 Loop While True 
                 
 pConvert1.StopConvert() 
 lStart = LastStop 
End Sub

void ConcateFile(ConvertCtrl pConvert1, MultiStreamTarget pMSTarget, MultiStreamSource pMSSource, ref long lStart) 
{ 
   MediaSample pmsSrc = null; 
   MediaSample pmsDst = null; 
   long MediaTimeStart; 
   long MediaTimeStop; 
   long LastStart; 
   long LastStop; 
   int lSampleStream; 
   int lActualDataLength; 
                 
   LastStop = 0; 
                 
   do 
   { 
      // get the sample, allowing 10 s for the operation to complete 
      try 
      { 
         lSampleStream = pMSTarget.WaitForSample(1000); 
      } 
      catch (COMException cex) 
      { 
         if (cex.ErrorCode == (int)ErrorCode.VFW_E_TIMEOUT) 
         { 
            // end of the stream 
            break; 
         } 
         break; 
      } 
                 
      try 
      { 
         // get the target sample 
         pmsSrc = pMSTarget.GetSample(lSampleStream, 0); 
         // get the source buffer 
         pmsDst = pMSSource.GetSampleBuffer(lSampleStream, 2000); 
      } 
      catch (Exception) 
      { 
         break; 
      } 
                 
      // get the media time 
      pmsSrc.GetMediaTime(out MediaTimeStart, out MediaTimeStop); 
                 
      // get the source sample time 
      pmsSrc.GetTime(out LastStart, out LastStop); 
                        
      // set the destination sample time 
      pmsDst.SetTime(lStart + LastStart, lStart + LastStop); 
                 
      // copy the data 
      lActualDataLength = pmsSrc.ActualDataLength; 
                 
      // set the destination buffer  
      // we could Marshal the unmanaged buffer here, but no need since we are merely  
      // setting the destination to the source buffer contents (unaltered data) 
      pmsDst.SetData(lActualDataLength, pmsSrc.GetData(lActualDataLength)); 
                 
      // copy the other flags 
      pmsDst.Discontinuity = pmsSrc.Discontinuity; 
      pmsDst.Preroll = pmsSrc.Preroll; 
      pmsDst.SyncPoint = pmsSrc.SyncPoint; 
                 
      // release the source sample 
      pmsSrc = null; 
                 
      // deliver the destination sample 
      pMSSource.DeliverSample(lSampleStream, 1000, pmsDst); 
                 
      // release the destination sample 
      pmsDst = null; 
   } 
   while (true); 
                 
   pConvert1.StopConvert(); 
   lStart = LastStop; 
}