Unable to Join WaterMark Video

Question

I am developing win forms application to split,join,Add watermark(both text and image) to a split video file.i have completed all the above said operations.the problem is when i try to join watermarked videos which i have watermarked with my developed application i get an exception "An invalid Media type was specified" if i try to join the split video without watermark its getting joined without errors.

i am using "DirectShow" for Joining videos

here is the code to join video files

private void FrmVideoJoinStatus_Load(object sender, EventArgs e)
{
LoadList();
try
{
if (ds == null)
{
MyCallback pVideo = new MyCallback(tbVideo, tbTime, tbElapsed, progressBar1);
MyCallback pAudio = new MyCallback(tbAudio);

// FPS, BPP, Width, Height
ds = new DESCombine(30, 24, 1024, 768);

foreach (Chunk c in listBox1.Items)
{
if (c.sVideoFile == c.sAudioFile)
{
ds.AddAVFile(c.sVideoFile, c.lStart, c.lEnd);
}
else
{
if (c.sVideoFile != null)
{
ds.AddVideoFile(c.sVideoFile, c.lStart, c.lEnd);
}

if (c.sAudioFile != null)
{
ds.AddAudioFile(c.sAudioFile, c.lStart, c.lEnd);
}
}
}
IBaseFilter ibfVideoCompressor = GetVideoCompressor(tbCompressor.Text);
ds.RenderToAVI(ClassTransport.FilePath, ibfVideoCompressor, null, pVideo, pAudio);
ds.Completed += new EventHandler(Completed);
ds.FileCompleted += new EventHandler(FileCompleted);
ds.StartRendering();
progressBar1.Maximum = (int)(ds.MediaLength / (DESCombine.UNITS / 10));
progressBar1.Step = progressBar1.Maximum / 20;
progressBar1.Value = 0;
tbStatus.Text = "Running";
}
else
{
ds.Cancel();
}
}
catch (Exception ex)
{
MessageBox.Show(ex.Message, "Error", MessageBoxButtons.OK, MessageBoxIcon.Error);
ds.Dispose();
ds = null;
}
}

#region load Videos To list From Table

private void LoadList()
{
DataTable dt = ClassTransport.Table;
foreach (DataRow row in dt.Rows)
{
Chunk c = new Chunk(
row["File"].ToString(),
row["File"].ToString(),
"0",
"-1");
int i = listBox1.Items.Add(c);
listBox1.SelectedIndex = i;
}
}

#endregion


Code for water mark Video

#region WaterMark
[STAThreadAttribute]
private void AddWaterMark(object row)
{

DataRow Drow = (DataRow)(row);
DirectoryInfo info = new DirectoryInfo(Convert.ToString(Drow["FilePath"]));
string[] filename = info.Name.Split('.');
string outputFile = ClassTransport.ClipSavePath + "\\" + filename[0] + "WaterMarked" + info.Extension;



using (ITimeline timeline = new DefaultTimeline(15))
{
timeline.AddAudioGroup().AddTrack();



// add a video group, 32bpp, 320x240 (32bpp required to allow for an alpha channel)

IGroup videoGroup = timeline.AddVideoGroup(32, 720, 480);



// add our default video track

ITrack videoTrack = videoGroup.AddTrack();



// add another video track, this will be used to contain our watermark image

ITrack watermarkTrack = videoGroup.AddTrack();



// add the video in "transitions.wmv" to the first video track, and the audio in "transitions.wmv"

// to the first audio track.

timeline.AddVideoWithAudio(Drow["FilePath"].ToString());

Bitmap image, BImage,TextImage;
image = new Bitmap(int.Parse(ConfigurationSettings.AppSettings["VideoWidth"].ToString()), int.Parse(ConfigurationSettings.AppSettings["VideoHeight"].ToString()));
BImage = new Bitmap(int.Parse(ConfigurationSettings.AppSettings["VideoWidth"].ToString()), int.Parse(ConfigurationSettings.AppSettings["VideoHeight"].ToString()));
TextImage = new Bitmap(int.Parse(ConfigurationSettings.AppSettings["VideoWidth"].ToString()), int.Parse(ConfigurationSettings.AppSettings["VideoHeight"].ToString()));
TextImage = CreateBitmapImage(Drow);
image = CloneImage(TextImage);
//TODO:Adding Logo Call in Form 1
if (Drow["Logo"] != null)
{

BImage = ((Bitmap)Image.FromFile(Drow["Logo"].ToString()));
image = CloneLogoWithImage(BImage, image, Drow);

}

// add the watermark image in, and apply it for the duration of the videoContent

// this image will be stretched to fit the video clip, and in this case is a transparent gif.


IClip watermarkClip = watermarkTrack.AddImage(image, 0, videoTrack.Duration);








// add a alpha setter effect to the image, this will adjust the alpha of the image to be 0.5

// of it's previous value - so the watermark is 50% transparent.

watermarkClip.AddEffect(0, watermarkClip.Duration, StandardEffects.CreateAlphaSetterRamp(((double)Drow["Opacity"])));



// add a transition to the watermark track, this allows the video clip to "shine through" the watermark,

// base on the values present in the alpha channel of the watermark track.

watermarkTrack.AddTransition(0, videoTrack.Duration,

StandardTransitions.CreateKey(KeyTransitionType.Alpha, null, null, null, null, null),

false);

//using (

// render it to windows media

IRenderer renderer = new WindowsMediaRenderer(timeline, outputFile, WindowsMediaProfiles.HighQualityVideo);

// {
using ((System.IDisposable)renderer)
{
renderer.Render();
}

//}
//}

}
Drow["filePath"] = outputFile;
}
#endregion

Please help me if any possible suggestions..thank you