本文實例講述了C#調用mmpeg進行各種視頻轉換的類。分享給大家供大家參考。具體如下：
這個C#類封裝了視頻轉換所需的各種方法，基本上是圍繞著如何通過mmpeg工具來進行視頻轉換
using System.Web;using System.Configuration;namespace DotNet.Utilities{ //if (this.fload.HasFile) //{ // string upFileName = HttpContext.Current.Server.MapPath("~/savefile") + "http://" + this.fload.PostedFile.FileName; // string saveName = DateTime.Now.ToString("yyyyMMddHHmmssffff"); // string playFile = Server.MapPath(VideoConvert.savefile + saveName); // string imgFile = Server.MapPath(VideoConvert.savefile + saveName); // VideoConvert pm = new VideoConvert(); // string m_strExtension = VideoConvert.GetExtension(this.fload.PostedFile.FileName).ToLower(); // if (m_strExtension == "flv") // { // System.IO.File.Copy(upFileName, playFile + ".flv"); // pm.CatchImg(upFileName, imgFile); // } // string Extension = pm.CheckExtension(m_strExtension); // if (Extension == "ffmpeg") // { // pm.ChangeFilePhy(upFileName, playFile, imgFile); // } // else if (Extension == "mencoder") // { // pm.MChangeFilePhy(upFileName, playFile, imgFile); // } //} public class VideoConvert : System.Web.UI.Page { public VideoConvert() { } string[] strArrMencoder = new string[] { "wmv", "rmvb", "rm" }; string[] strArrFfmpeg = new string[] { "asf", "avi", "mpg", "3gp", "mov" }; #region 配置 public static string ffmpegtool = ConfigurationManager.AppSettings["ffmpeg"]; public static string mencodertool = ConfigurationManager.AppSettings["mencoder"]; public static string savefile = ConfigurationManager.AppSettings["savefile"] + "/"; public static string sizeOfImg = ConfigurationManager.AppSettings["CatchFlvImgSize"]; public static string widthOfFile = ConfigurationManager.AppSettings["widthSize"]; public static string heightOfFile = ConfigurationManager.AppSettings["heightSize"]; #endregion #region 獲取文件的名字 /// <summary> /// 獲取文件的名字 /// </summary> public static string GetFileName(string fileName) { int i = fileName.LastIndexOf("http://") + 1; string Name = fileName.Substring(i); return Name; } #endregion #region 獲取文件擴展名 /// <summary> /// 獲取文件擴展名 /// </summary> public static string GetExtension(string fileName) { int i = fileName.LastIndexOf(".") + 1; string Name = fileName.Substring(i); return Name; } #endregion #region 獲取文件類型 /// <summary> /// 獲取文件類型 /// </summary> public string CheckExtension(string extension) { string m_strReturn = ""; foreach (string var in this.strArrFfmpeg) { if (var == extension) { m_strReturn = "ffmpeg"; break; } } if (m_strReturn == "") { foreach (string var in strArrMencoder) { if (var == extension) { m_strReturn = "mencoder"; break; } } } return m_strReturn; } #endregion #region 視頻格式轉為Flv /// <summary> /// 視頻格式轉為Flv /// </summary> /// <param name="vFileName">原視頻文件地址</param> /// <param name="ExportName">生成后的Flv文件地址</param> public bool ConvertFlv(string vFileName, string ExportName) { if ((!System.IO.File.Exists(ffmpegtool)) || (!System.IO.File.Exists(HttpContext.Current.Server.MapPath(vFileName)))) { return false; } vFileName = HttpContext.Current.Server.MapPath(vFileName); ExportName = HttpContext.Current.Server.MapPath(ExportName); string Command = " -i /"" + vFileName + "/" -y -ab 32 -ar 22050 -b 800000 -s 480*360 /"" + ExportName + "/""; //Flv格式 System.Diagnostics.Process p = new System.Diagnostics.Process(); p.StartInfo.FileName = ffmpegtool; p.StartInfo.Arguments = Command; p.StartInfo.WorkingDirectory = HttpContext.Current.Server.MapPath("~/tools/"); p.StartInfo.UseShellExecute = false; p.StartInfo.RedirectStandardInput = true; p.StartInfo.RedirectStandardOutput = true; p.StartInfo.RedirectStandardError = true; p.StartInfo.CreateNoWindow = false; p.Start(); p.BeginErrorReadLine(); p.WaitForExit(); p.Close(); p.Dispose(); return true; } #endregion #region 生成Flv視頻的縮略圖 /// <summary> /// 生成Flv視頻的縮略圖 /// </summary> /// <param name="vFileName">視頻文件地址</param> public string CatchImg(string vFileName) { if ((!System.IO.File.Exists(ffmpegtool)) || (!System.IO.File.Exists(HttpContext.Current.Server.MapPath(vFileName)))) return ""; try { string flv_img_p = vFileName.Substring(0, vFileName.Length - 4) + ".jpg"; string Command = " -i " + HttpContext.Current.Server.MapPath(vFileName) + " -y -f image2 -t 0.1 -s " + sizeOfImg + " " + HttpContext.Current.Server.MapPath(flv_img_p); System.Diagnostics.Process p = new System.Diagnostics.Process(); p.StartInfo.FileName = ffmpegtool; p.StartInfo.Arguments = Command; p.StartInfo.WindowStyle = System.Diagnostics.ProcessWindowStyle.Normal; try { p.Start(); } catch { return ""; } finally { p.Close(); p.Dispose(); } System.Threading.Thread.Sleep(4000); //注意:圖片截取成功后,數據由內存緩存寫到磁盤需要時間較長,大概在3,4秒甚至更長; if (System.IO.File.Exists(HttpContext.Current.Server.MapPath(flv_img_p))) { return flv_img_p; } return ""; } catch { return ""; } } #endregion #region 運行FFMpeg的視頻解碼(絕對路徑) /// <summary> /// 轉換文件并保存在指定文件夾下 /// </summary> /// <param name="fileName">上傳視頻文件的路徑（原文件）</param> /// <param name="playFile">轉換后的文件的路徑（網絡播放文件）</param> /// <param name="imgFile">從視頻文件中抓取的圖片路徑</param> /// <returns>成功:返回圖片虛擬地址;失敗:返回空字符串</returns> public string ChangeFilePhy(string fileName, string playFile, string imgFile) { string ffmpeg = Server.MapPath(VideoConvert.ffmpegtool); if ((!System.IO.File.Exists(ffmpeg)) || (!System.IO.File.Exists(fileName))) { return ""; } string flv_file = System.IO.Path.ChangeExtension(playFile, ".flv"); string FlvImgSize = VideoConvert.sizeOfImg; System.Diagnostics.ProcessStartInfo FilestartInfo = new System.Diagnostics.ProcessStartInfo(ffmpeg); FilestartInfo.WindowStyle = System.Diagnostics.ProcessWindowStyle.Hidden; FilestartInfo.Arguments = " -i " + fileName + " -ab 56 -ar 22050 -b 500 -r 15 -s " + widthOfFile + "x" + heightOfFile + " " + flv_file; try { System.Diagnostics.Process.Start(FilestartInfo);//轉換 CatchImg(fileName, imgFile); //截圖 } catch { return ""; } return ""; } public string CatchImg(string fileName, string imgFile) { string ffmpeg = Server.MapPath(VideoConvert.ffmpegtool); string flv_img = imgFile + ".jpg"; string FlvImgSize = VideoConvert.sizeOfImg; System.Diagnostics.ProcessStartInfo ImgstartInfo = new System.Diagnostics.ProcessStartInfo(ffmpeg); ImgstartInfo.WindowStyle = System.Diagnostics.ProcessWindowStyle.Hidden; ImgstartInfo.Arguments = " -i " + fileName + " -y -f image2 -ss 2 -vframes 1 -s " + FlvImgSize + " " + flv_img; try { System.Diagnostics.Process.Start(ImgstartInfo); } catch { return ""; } if (System.IO.File.Exists(flv_img)) { return flv_img; } return ""; } #endregion #region 運行FFMpeg的視頻解碼(相對路徑) /// <summary> /// 轉換文件并保存在指定文件夾下 /// </summary> /// <param name="fileName">上傳視頻文件的路徑（原文件）</param> /// <param name="playFile">轉換后的文件的路徑（網絡播放文件）</param> /// <param name="imgFile">從視頻文件中抓取的圖片路徑</param> /// <returns>成功:返回圖片虛擬地址;失敗:返回空字符串</returns> public string ChangeFileVir(string fileName, string playFile, string imgFile) { string ffmpeg = Server.MapPath(VideoConvert.ffmpegtool); if ((!System.IO.File.Exists(ffmpeg)) || (!System.IO.File.Exists(fileName))) { return ""; } string flv_img = System.IO.Path.ChangeExtension(Server.MapPath(imgFile), ".jpg"); string flv_file = System.IO.Path.ChangeExtension(Server.MapPath(playFile), ".flv"); string FlvImgSize = VideoConvert.sizeOfImg; System.Diagnostics.ProcessStartInfo ImgstartInfo = new System.Diagnostics.ProcessStartInfo(ffmpeg); ImgstartInfo.WindowStyle = System.Diagnostics.ProcessWindowStyle.Hidden; ImgstartInfo.Arguments = " -i " + fileName + " -y -f image2 -t 0.001 -s " + FlvImgSize + " " + flv_img; System.Diagnostics.ProcessStartInfo FilestartInfo = new System.Diagnostics.ProcessStartInfo(ffmpeg); FilestartInfo.WindowStyle = System.Diagnostics.ProcessWindowStyle.Hidden; FilestartInfo.Arguments = " -i " + fileName + " -ab 56 -ar 22050 -b 500 -r 15 -s " + widthOfFile + "x" + heightOfFile + " " + flv_file; try { System.Diagnostics.Process.Start(FilestartInfo); System.Diagnostics.Process.Start(ImgstartInfo); } catch { return ""; } ///注意:圖片截取成功后,數據由內存緩存寫到磁盤需要時間較長,大概在3,4秒甚至更長; ///這兒需要延時后再檢測,我服務器延時8秒,即如果超過8秒圖片仍不存在,認為截圖失敗; if (System.IO.File.Exists(flv_img)) { return flv_img; } return ""; } #endregion #region 運行mencoder的視頻解碼器轉換(絕對路徑) /// <summary> /// 運行mencoder的視頻解碼器轉換 /// </summary> public string MChangeFilePhy(string vFileName, string playFile, string imgFile) { string tool = Server.MapPath(VideoConvert.mencodertool); if ((!System.IO.File.Exists(tool)) || (!System.IO.File.Exists(vFileName))) { return ""; } string flv_file = System.IO.Path.ChangeExtension(playFile, ".flv"); string FlvImgSize = VideoConvert.sizeOfImg; System.Diagnostics.ProcessStartInfo FilestartInfo = new System.Diagnostics.ProcessStartInfo(tool); FilestartInfo.WindowStyle = System.Diagnostics.ProcessWindowStyle.Hidden; FilestartInfo.Arguments = " " + vFileName + " -o " + flv_file + " -of lavf -lavfopts i_certify_that_my_video_stream_does_not_use_b_frames -oac mp3lame -lameopts abr:br=56 -ovc lavc -lavcopts vcodec=flv:vbitrate=200:mbd=2:mv0:trell:v4mv:cbp:last_pred=1:dia=-1:cmp=0:vb_strategy=1 -vf scale=" + widthOfFile + ":" + heightOfFile + " -ofps 12 -srate 22050"; try { System.Diagnostics.Process.Start(FilestartInfo); CatchImg(flv_file, imgFile); } catch { return ""; } return ""; } #endregion }}希望本文所述對大家的C#程序設計有所幫助。
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