Video Merging using Splicer Lib

Hi.
I tried to merge two videos into one using Splicer library. When I ran the code (below), the code got non-responsive, so after awhile I stopped the code from executing. The resulting file (which was created by the code while it has became non-responsive) was over 11GB. I'm not sure how to fix that. Could anyone guide me please? Thanks.

Code:

---


...
//Create a string array to store file paths
string[] filepaths = new string[10];
filepaths.SetValue(textBox_Source1.Text, 0);
filepaths.SetValue(textBox_Source2.Text, 1);
//Call the video merging function
MergeVideos(filepaths, filepaths[0] + "_merged");


....
using (ITimeline timeline = new DefaultTimeline())
{
    IGroup group = timeline.AddVideoGroup(32, 720, 576); // Set bitrate, width, height


    var firstClip = group.AddTrack().AddVideo(videoPaths[0]);
    var secondClip = group.AddTrack().AddVideo(videoPaths[1], firstClip.Duration /* offset */);


    using (AviFileRenderer renderer = new AviFileRenderer(timeline, outputFilePath))
    {
        renderer.Render();
    }
}

---