private void convertProcess() { char comm = '"'; string filename = Path.GetFileNameWithoutExtension(mp3txt.Text); convertBtn.Enabled = false; stopBtn.Enabled = true; Conversion convert = new Conversion(); convert.AddParameter(@"-r 1 -loop 1 -i " + comm + imgtxt.Text + comm + " -i " + comm + mp3txt.Text + comm + " -acodec copy -r 1 -shortest -vf scale=1280:-1 " + comm + outputtxt.Text + "\\" + filename + "_(video).flv" + comm); convert.OnProgress += Convert_OnProgress; convert.Start(); }