/// <summary>Add a wave audio stream from another file to this file</summary>
/// <param name="waveFileName">Name of the wave file to add</param>
/// <param name="startAtFrameIndex">Index of the video frame at which the sound is going to start</param>
public void AddAudioStream(String waveFileName, int startAtFrameIndex)
{
AviManager audioManager = new AviManager(waveFileName, true);
AudioStream newStream = audioManager.GetWaveStream();
AddAudioStream(newStream, startAtFrameIndex);
audioManager.Close();
}