FFMPEG的.Net封装，FFmpeg.NET

柔光的暖阳◎ 2022-08-07 04:40 215阅读 0赞

原文地址：  [http://www.open-open.com/lib/view/open1354088827449.html][http_www.open-open.com_lib_view_open1354088827449.html]

### FFMPEG的.Net封装，FFmpeg.NET ###

这是FFMPEG库的一个.Net封装，设计为易于使用，并尽可能完整。具有以下功能：

*  Decode of video frames (can save them as BMPs or whatever format GDI+ supports, returns a Bitmap)
 *  Decode of audio into PCM (which can then be saved into a WAV file)
 *  The release will build into a single assembly - no FFMPEG dlls or any other files! Everything is linked in.
 *  Encoding support
 *  Some utilitiy classes to wrap WAV files.
 *  Weed out the memory leaks.

项目主页：[http://www.open-open.com/lib/view/home/1354088827449][http_www.open-open.com_lib_view_home_1354088827449]

相关文章： [http://www.cnblogs.com/xiaotie/archive/2013/01/05/2845576.html][http_www.cnblogs.com_xiaotie_archive_2013_01_05_2845576.html]

视频格式转Flv

using System;
    using System.Web;
    namespace JumboTCMS.Utils
    {
        /// <summary>
        /// ffmpeg.exe调用
        /// </summary>
        public static class ffmpegHelp
        {
            /// <summary>
            /// 视频格式转为Flv
            /// </summary>
            /// <param name="vFileName">原视频文件地址</param>
            /// <param name="WidthAndHeight">宽和高参数，如：480*360</param>
            /// <param name="ExportName">生成后的FLV文件地址</param>
            /// <returns></returns>
            public static bool Convert2Flv(string vFileName, string WidthAndHeight, string ExportName)
            {
                try
                {
                    vFileName = HttpContext.Current.Server.MapPath(vFileName);
                    ExportName = HttpContext.Current.Server.MapPath(ExportName);
                    string Command = " -i \"" + vFileName + "\" -y -ab 32 -ar 22050 -b 800000 -s " + WidthAndHeight + " \"" + ExportName + "\""; //Flv格式   
                    System.Diagnostics.Process p = new System.Diagnostics.Process();
                    p.StartInfo.FileName = @"ffmpeg.exe";
                    p.StartInfo.Arguments = Command;
                    p.StartInfo.WorkingDirectory = HttpContext.Current.Server.MapPath("~/bin/tools/");
                    #region 方法一
                    //p.StartInfo.UseShellExecute = false;//不使用操作系统外壳程序 启动 线程
                    //p.StartInfo.RedirectStandardError = true;//把外部程序错误输出写到StandardError流中(这个一定要注意,FFMPEG的所有输出信息,都为错误输出流,用 StandardOutput是捕获不到任何消息的...
                    //p.StartInfo.CreateNoWindow = false;//不创建进程窗口
                    //p.Start();//启动线程
                    //p.BeginErrorReadLine();//开始异步读取
                    //p.WaitForExit();//等待完成
                    //p.Close();//关闭进程
                    //p.Dispose();//释放资源
                    #endregion
                    #region 方法二
                    p.StartInfo.CreateNoWindow = true;
                    p.StartInfo.WindowStyle = System.Diagnostics.ProcessWindowStyle.Hidden;
                    p.Start();//启动线程
                    p.WaitForExit();//等待完成
                    p.Close();//关闭进程
                    p.Dispose();//释放资源
                    #endregion
                }
                catch (System.Exception e)
                {
                    throw e;
                }
                return true;
            }
            /// <summary>
            /// 生成FLV视频的缩略图
            /// </summary>
            /// <param name="vFileName">视频文件地址</param>
            /// <param name="FlvImgSize">宽和高参数，如：240*180</param>
            /// <returns></returns>
            public static string CatchImg(string vFileName, string FlvImgSize, string Second)
            {
                if (!System.IO.File.Exists(HttpContext.Current.Server.MapPath(vFileName)))
                    return "";
                try
                {
                    string flv_img_p = vFileName.Substring(0, vFileName.Length - 4) + "_thumb.jpg";
                    string Command = " -i \"" + HttpContext.Current.Server.MapPath(vFileName) + "\" -y -f image2 -ss " + Second + " -t 0.1 -s " + FlvImgSize + " \"" + HttpContext.Current.Server.MapPath(flv_img_p) + "\"";
                    System.Diagnostics.Process p = new System.Diagnostics.Process();
                    p.StartInfo.FileName = @"ffmpeg.exe";
                    p.StartInfo.Arguments = Command;
                    p.StartInfo.WindowStyle = System.Diagnostics.ProcessWindowStyle.Hidden;
                    p.StartInfo.WorkingDirectory = HttpContext.Current.Server.MapPath("~/bin/tools/");
                    //不创建进程窗口
                    p.StartInfo.CreateNoWindow = true;
                    p.Start();//启动线程
                    p.WaitForExit();//等待完成
                    p.Close();//关闭进程
                    p.Dispose();//释放资源
                    System.Threading.Thread.Sleep(4000);
                    //注意:图片截取成功后,数据由内存缓存写到磁盘需要时间较长,大概在3,4秒甚至更长;
                    if (System.IO.File.Exists(HttpContext.Current.Server.MapPath(flv_img_p)))
                    {
                        return flv_img_p;
                    }
                    return "";
                }
                catch
                {
                    return "";
                }
            }
        }
    }

[http_www.open-open.com_lib_view_open1354088827449.html]: http://www.open-open.com/lib/view/open1354088827449.html
[http_www.open-open.com_lib_view_home_1354088827449]: http://www.open-open.com/lib/view/home/1354088827449
[http_www.cnblogs.com_xiaotie_archive_2013_01_05_2845576.html]: http://www.cnblogs.com/xiaotie/archive/2013/01/05/2845576.html