Catch Command Prompt Errors In Code?

I am running ffmpeg.exe from command prompt through asp.net code. Is there any method to know success and errors of the ffmpeg.exe execution in asp.net code ?

My code is as follows:

string OutputFile, FilArgs;
//output file format in swf
//outputfile = SavePath + "SWF\" + withoutext + ".swf";
OutputFile = SavePath + "SWF\" + WithOutExt + ".flv";
//file orguments for FFMEPG
//filargs = "-i "" + inputfile + "" -ar 22050 "" + outputfile;
FilArgs = "-i "" + InputFile + "" -ar 22050 "" + OutputFile;
//string spath;
//spath = Server.MapPath(".");
Process proc;
proc = new Process();
proc.StartInfo.FileName = spath + "\ffmpeg\ffmpeg.exe";
proc.StartInfo.Arguments = FilArgs;
proc.StartInfo.UseShellExecute = false;
proc.StartInfo.CreateNoWindow = false;
proc.StartInfo.RedirectStandardOutput = false;
try
{
proc.Start();
}
catch (Exception ex)
{
Response.Write(ex.Message);
}
proc.WaitForExit();
proc.Close();