private void btnExtractPart_Click(object sender, EventArgs e) { AviManager aviManager = new AviManager(txtAviFileName.Text, true); VideoStream aviStream = aviManager.GetVideoStream(); CopyForm dialog = new CopyForm(0, (int)Math.Floor(aviStream.CountFrames / aviStream.FrameRate)); if (dialog.ShowDialog() == DialogResult.OK) { int startSecond = dialog.Start; int stopSecond = dialog.Stop; txtReportCopy.Text = "Cutting seconds from " + txtAviFileName.Text + " to video.avi...\r\n"; AviManager newFile = aviManager.CopyTo("..\\..\\testdata\\video.avi", startSecond, stopSecond); newFile.Close(); txtReportCopy.Text += "...finished."; } aviManager.Close(); }