c# ffmpeg视频转换

c#  ffmpeg视频转换

什么是ffmpeg，它有什么作用呢，怎么可以使用它呢，带着问题去找答案吧！先参考百度百科把，我觉得它很强大无奇不有，为了方便大家我就把链接提供了！

http://baike.baidu.com/link?url=bD4xX59DgppfdclpyGfmC38WTeEkOTM9yc35XGi4OLnQYY7BqmPJSIZHyPKp0imUdI2yujK76Nm047ACZW2hHa

今天工作中遇到这么个问题，这个问题很屌，我通过搜索引擎找了个遍，几乎没有找到理想的答案，于是被逼无奈之下，自己研究参数，于是就有了如下的成就，所以，遇到问题不要害怕，这才是成长最快的时刻。当问题解决了的时候，会有种无比的成就感，把自己的成果分享给他人，供他人参考，这也是种喜悦！

------------没有做不到的，只有想不到的。

转码进度公式=当前时间/总时间*100%；

   public class FFmpeg
     {
         static int timeCount;
         public static void Execute()
         {
             Process p = new Process();
             p.StartInfo.FileName = @"E:\张立平资料\Demo\FFmpeg_Demo\ffmpeg\ffmpeg.exe";
             p.StartInfo.UseShellExecute = false;
             string srcFileName = @"E:\张立平资料\Demo\FFmpeg_Demo\videoold\test.mov";
             string destFileName = @"E:\张立平资料\Demo\FFmpeg_Demo\videonew\test.mp4";
             p.StartInfo.Arguments = "-i " + srcFileName + " -y -ab 56 -ar 22050 -b 800 -r 29.97 -s 420x340 " + destFileName;    //执行参数
             //-i D:/vts-collector/test/swap/7a3c9800-2e2f-42fe-ba39-56b25f972e06.mov -y -ab 56 -ar 22050 -b 800 -r 29.97 -s 420x340 D:/vts-collector/test/swap/7a3c9800-2e2f-42fe-ba39-56b25f972e06_mov_stream.mp4

             p.StartInfo.RedirectStandardInput = true;
             p.StartInfo.RedirectStandardOutput = true;
             p.StartInfo.RedirectStandardError = true;//把外部程序错误输出写到StandardError流中
             p.ErrorDataReceived += new DataReceivedEventHandler(p_ErrorDataReceived);
             p.OutputDataReceived += new DataReceivedEventHandler(p_OutputDataReceived);

             using (p)
             {
                 p.Start();
                 p.BeginErrorReadLine();//开始异步读取
                 p.WaitForExit();//阻塞等待进程结束
                 p.Close();//关闭进程
             }
         }

         private static void p_ErrorDataReceived(object sender, DataReceivedEventArgs e)
         {

             var output = e.Data;
             if (output != null)
             {
                 if (output.Contains("Duration"))
                 {
                     Int32 indexOfDuration = output.IndexOf("Duration");
                     Int32 indexOfBegin = output.IndexOf(":", indexOfDuration);
                     Int32 indexOfEnd = output.IndexOf(",", indexOfBegin);
                     var duration = output.Substring(indexOfBegin + , indexOfEnd - indexOfBegin - );
                     timeCount =ConvertStringtoSecond(duration);
                 }
                 if (output.Contains("time="))
                 {
                     Int32 indexOfTime = output.IndexOf("time=");
                     Int32 indexOfBegin = output.IndexOf("=", indexOfTime);
                     Int32 indexOfEnd = output.IndexOf("bitrate", indexOfBegin);
                     string timeStr = output.Substring(indexOfBegin + , indexOfEnd - indexOfBegin - );
                     var time =Convert.ToDouble(timeStr);
                     var process = time / timeCount*;
                     process = Math.Round(process);
                     Console.Write("{0}% ", process);
                 }
                 //Console.WriteLine(e.Data);
             }
         }

         private static int ConvertStringtoSecond(string input)
         {
             int totalSecond = ;
             try
             {
                 string[] split = input.Split(new char[] { ':', '.' });
                 int hour = int.Parse(split[]) * ;
                 int min = int.Parse(split[]) * ;
                 int second = int.Parse(split[]);
                 int millisecond = int.Parse(split[]) / ;
                 totalSecond = hour + min + second + millisecond;
             }
             catch (System.Exception ex)
             {
                 Console.Write(ex.Message);

             }
             return totalSecond;
         }

         private static void p_OutputDataReceived(object sender, DataReceivedEventArgs e)
         {
             Console.WriteLine(e.Data);
         }
     }