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 + 1, indexOfEnd - indexOfBegin - 1);
                    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 + 1, indexOfEnd - indexOfBegin - 1);
                    var time =Convert.ToDouble(timeStr);
                    var process = time / timeCount*100;
                    process = Math.Round(process);
                    Console.Write("{0}% ", process);
                }
                //Console.WriteLine(e.Data);
            }
        }

        private static int ConvertStringtoSecond(string input)
        {
            int totalSecond = 0;
            try
            {
                string[] split = input.Split(new char[] { ':', '.' });
                int hour = int.Parse(split[0]) * 3600;
                int min = int.Parse(split[1]) * 60;
                int second = int.Parse(split[2]);
                int millisecond = int.Parse(split[3]) / 1000;
                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);
        }
    }