這個是我今天整理項目的時候無意發現的，當時主要是用它來轉換flv文件在手機上使用，后來買了psp之后就沒有用了，記錄一下，以后寫這種類似的程序可以參考。

class VideoConverter : IDisposable
{
????public string InputFile { get; private set; }
????public string OutPutFile { get; private set; }
????public int Progress { get; private set; }
????public object Tag { get; set; }

????double totalTime;

????public VideoConverter(string input, string output)
????{
????????InputFile = input;
????????OutPutFile = output;
????}

????~VideoConverter()
????{
????????Dispose();
????}

????const string ffmpeg_exe = "ffmpeg.exe";

????/// <summary>
????/// 這個是個阻塞調用，切勿在ui線程上調用
????/// </summary>
????public void Process()
????{
????????var sb = new StringBuilder();
????????ExcuteProcess(ffmpeg_exe, string.Format(" -i \"{0}\"", InputFile), (s, e) => sb.AppendLine(e.Data));
????????var totalT = SimpleMatch(sb.ToString(), @"Duration:\s+(\S+?)[,\s]");
????????var totalTs = TimeSpan.Parse(totalT);
????????totalTime = totalTs.TotalSeconds;
????????ExcuteProcess(ffmpeg_exe, string.Format(" -i \"{0}\" \"{1}\" ", InputFile, OutPutFile), (s, e) => ProcessOutPut(e.Data));????????
????????Progress = 100;
????????Console.WriteLine("-----------{0}---------", Progress);
????}

????string SimpleMatch(string data, string patten)
????{
????????Console.WriteLine(data);
????????var m = System.Text.RegularExpressions.Regex.Match(data, patten);
????????return m.Groups[1].Value;
????}

????void ExcuteProcess(string exe, string arg, DataReceivedEventHandler output)
????{
????????Console.WriteLine(exe + " " + arg);
????????using (var p = new Process())
????????{
????????????killHanlder = p.Kill;
????????????p.StartInfo.FileName = exe;
????????????p.StartInfo.Arguments = arg;

????????????p.StartInfo.UseShellExecute = false;????//輸出信息重定向
????????????p.StartInfo.CreateNoWindow = true;
????????????p.StartInfo.RedirectStandardError = true;
????????????p.StartInfo.RedirectStandardOutput = true;

????????????p.OutputDataReceived += output;
????????????p.ErrorDataReceived += output;

????????????p.Start();????????????????????//啟動線程
????????????p.BeginOutputReadLine();
????????????p.BeginErrorReadLine();
????????????p.WaitForExit();????????????//等待進程結束
????????}

????????killHanlder = null;
????}

????void ProcessOutPut(string output)
????{
????????Console.WriteLine(output);
????????if (string.IsNullOrEmpty(output))
????????????return;

????????if (!output.Contains("time="))
????????????return;

????????var current = SimpleMatch(output, @"time=(\S+)");
????????var currentTime = double.Parse(current);

????????Progress = (int)(currentTime * 100 / totalTime);
????????if (Progress > 100)
????????????Progress = 100;

????????Console.WriteLine("-----------{0}---------", Progress);
????}

????#region IDisposable 成員

????Action killHanlder;
????public void Dispose()
????{
????????if (killHanlder == null)
????????????return;

????????killHanlder();
????????killHanlder = null;
????}

????#endregion
}

ffmpeg下載地址：http://ffdshow.faireal.net/mirror/ffmpeg/

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