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();
}