public void Rewind()
		{
			Dispose();
			aviManager = new AviFile(filepath);
			video = aviManager.GetVideoStream();
			audio = aviManager.GetAudioStream();
		}
		public AviVideoStream(string filepath)
		{
			this.filepath = filepath;
			aviManager = new AviFile(filepath);
			video = aviManager.GetVideoStream();
			audio = aviManager.GetAudioStream();
		}
		public void Dispose()
		{
			if (aviManager != null)
				aviManager.Close();
			aviManager = null;
		}