asp.net音频转换之.amr转.mp3(利用ffmpeg转换法)

using System;
using System.Threading;
using System.IO;
using System.Diagnostics;
using System.Security;

public partial class cowala_201512Chritmas_amrtest : System.Web.UI.Page
{
 protected void Page_Load(object sender, EventArgs e)
 {
　　　　if (!IsPostBack) 
　　　　{
　　　　　　changedPlay.Visible = false;
　　　　}
 }

 protected void Ffmpeg_Click(object sender, EventArgs e)
 {
 if (AmrFileUp.HasFile)
 {
  string key = AmrFileUp.FileName;
  string savepath = Server.MapPath("~/upload/amr/") + key;
  AmrFileUp.SaveAs(savepath);

  string mp3SavePth = Server.MapPath("~/upload/mp3/") + key.Split('.')[0].ToString() + ".mp3";

  if (!string.IsNullOrEmpty(ConvertToMp3(savepath, mp3SavePth)))
  {
  changedPlay.Visible = true;
  changedPlay.Attributes.Add("src", "upload/mp3/" + key.Split('.')[0].ToString() + ".mp3");
  Response.Write("<script>alert('转换成功！');</script>");
  }
 }
 }

 public string ConvertToMp3(string pathBefore, string pathLater)
 {
 string c = Server.MapPath("/ffmpeg/") + @"ffmpeg.exe -i " + pathBefore + " " + pathLater;
 string str = RunCmd(c);
 return str;
 }

 /// <summary>
 /// 执行Cmd命令
 /// </summary>
 private string RunCmd(string c)
 {
 try
 {
  ProcessStartInfo info = new ProcessStartInfo("cmd.exe");
  info.RedirectStandardOutput = false;
  info.UseShellExecute = false;
  Process p = Process.Start(info);
  p.StartInfo.UseShellExecute = false;
  p.StartInfo.RedirectStandardInput = true;
  p.StartInfo.RedirectStandardOutput = true;
  p.StartInfo.RedirectStandardError = true;
  p.Start();
  p.StandardInput.WriteLine(c);
  p.StandardInput.AutoFlush = true;
  Thread.Sleep(1000);
  p.StandardInput.WriteLine("exit");
  p.WaitForExit();
  string outStr = p.StandardOutput.ReadToEnd();
  p.Close();

  return outStr;
 }
 catch (Exception ex)
 {
  return "error" + ex.Message;
 }
 }
}