Common下MadieHelper.cs

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本文介绍了一种使用FFmpeg和mencoder进行音视频文件转换的方法，包括文件路径配置、视频解码、转换及图片抓取等功能。适用于网络播放文件的处理。

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Configuration;

namespace Common
{
    public class MadieHelper : System.Web.UI.Page
    {
        //文件路径
        public static string ffmpegtool = ConfigurationManager.AppSettings["ffmpeg"];
        public static string mencodertool = ConfigurationManager.AppSettings["mencoder"];
        public static string upFile = ConfigurationManager.AppSettings["upfile"] + "/";
        public static string imgFile = ConfigurationManager.AppSettings["imgfile"] + "/";
        public static string playFile = ConfigurationManager.AppSettings["playfile"] + "/";
        //文件图片大小
        public static string sizeOfImg = ConfigurationManager.AppSettings["CatchFlvImgSize"];
        //文件大小
        public static string widthOfFile = ConfigurationManager.AppSettings["widthSize"];
        public static string heightOfFile = ConfigurationManager.AppSettings["heightSize"];
        //   // //获取文件的名字
        public static string GetFileName(string fileName)
        {
            int i = fileName.LastIndexOf("//") + 1;
            string Name = fileName.Substring(i);
            return Name;
        }
        //获取文件扩展名
        public static string GetExtension(string fileName)
        {
            int i = fileName.LastIndexOf(".") + 1;
            string Name = fileName.Substring(i);
            return Name;
        }
        //
        #region //运行FFMpeg的视频解码，(这里是绝对路径)
        /// <summary>
        /// 转换文件并保存在指定文件夹下面(这里是绝对路径)
        /// </summary>
        /// <param name="fileName">上传视频文件的路径（原文件）</param>
        /// <param name="playFile">转换后的文件的路径（网络播放文件）</param>
        /// <param name="imgFile">从视频文件中抓取的图片路径</param>
        /// <returns>成功:返回图片虚拟地址;   失败:返回空字符串</returns>
        public string ChangeFilePhy(string fileName, string playFile, string imgFile)
        {
            //取得ffmpeg.exe的路径,路径配置在Web.Config中,如:<add   key="ffmpeg"   value="E:/aspx1/ffmpeg.exe"   />
            string ffmpeg = Server.MapPath(ffmpegtool);
            if ((!System.IO.File.Exists(ffmpeg)) || (!System.IO.File.Exists(fileName)))
            {
                return "";
            }

//获得图片和(.flv)文件相对路径/最后存储到数据库的路径,如:/Web/User1/00001.jpg

string flv_file = System.IO.Path.ChangeExtension(playFile, ".flv");

//截图的尺寸大小,配置在Web.Config中,如:<add key="CatchFlvImgSize" value="240x180" />
string FlvImgSize =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;
//ImgstartInfo.Arguments = " -i " + fileName + " -y -f image2 -t 0.05 -s " + FlvImgSize + " " + flv_img;

            try
            {
                //转换
                System.Diagnostics.Process.Start(FilestartInfo);

                //截图
                return CatchImg(fileName, imgFile);
                //System.Diagnostics.Process.Start(ImgstartInfo);
            }
            catch
            {
                return "";
            }

        }
        //
        public string CatchImg(string fileName, string imgFile)
        {
            //
            string ffmpeg = Server.MapPath(ffmpegtool);
            //
            string flv_img = imgFile + ".jpg";
            //
            string FlvImgSize = 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
        /// <summary>
        /// 转换文件并保存在指定文件夹下面(这里是相对路径)
        /// </summary>
        /// <param name="fileName">上传视频文件的路径（原文件）</param>
        /// <param name="playFile">转换后的文件的路径（网络播放文件）</param>
        /// <param name="imgFile">从视频文件中抓取的图片路径</param>
        /// <returns>成功:返回图片虚拟地址;   失败:返回空字符串</returns>
        public string ChangeFileVir(string fileName, string playFile, string imgFile)
        {
            //取得ffmpeg.exe的路径,路径配置在Web.Config中,如:<add   key="ffmpeg"   value="E:/aspx1/ffmpeg.exe"   />
            string ffmpeg = Server.MapPath(ffmpegtool);
            if ((!System.IO.File.Exists(ffmpeg)) || (!System.IO.File.Exists(fileName)))
            {
                return "";
            }

            //获得图片和(.flv)文件相对路径/最后存储到数据库的路径,如:/Web/User1/00001.jpg
            string flv_img = System.IO.Path.ChangeExtension(Server.MapPath(imgFile), ".jpg");
            string flv_file = System.IO.Path.ChangeExtension(Server.MapPath(playFile), ".flv");

//截图的尺寸大小,配置在Web.Config中,如:<add key="CatchFlvImgSize" value="240x180" />
string FlvImgSize = sizeOfImg;

System.Diagnostics.ProcessStartInfo FilestartInfo = new System.Diagnostics.ProcessStartInfo(ffmpeg);
System.Diagnostics.ProcessStartInfo ImgstartInfo = new System.Diagnostics.ProcessStartInfo(ffmpeg);

            FilestartInfo.WindowStyle = System.Diagnostics.ProcessWindowStyle.Hidden;
            ImgstartInfo.WindowStyle = System.Diagnostics.ProcessWindowStyle.Hidden;
            //此处组合成ffmpeg.exe文件需要的参数即可,此处命令在ffmpeg   0.4.9调试通过
            //ffmpeg -i F:/01.wmv -ab 56 -ar 22050 -b 500 -r 15 -s 320x240 f:/test.flv
            FilestartInfo.Arguments = " -i " + fileName + " -ab 56 -ar 22050 -b 500 -r 15 -s " + widthOfFile + "x" + heightOfFile + " " + flv_file;
            ImgstartInfo.Arguments = "   -i   " + fileName + "   -y   -f   image2   -t   0.001   -s   " + FlvImgSize + "   " + flv_img;

            try
            {
                System.Diagnostics.Process.Start(FilestartInfo);
                System.Diagnostics.Process.Start(ImgstartInfo);
            }
            catch
            {
                return "";
            }

            /**/
            ///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;
            ///这儿需要延时后再检测,我服务器延时8秒,即如果超过8秒图片仍不存在,认为截图失败;
            ///此处略去延时代码.如有那位知道如何捕捉ffmpeg.exe截图失败消息,请告知,先谢过!
            if (System.IO.File.Exists(flv_img))
            {
                return flv_img;
            }

            return "";
        }
        #endregion

        #region
        /// <summary>
        /// 运行mencoder的视频解码器转换(这里是(绝对路径))
        /// </summary>
        /// <param name="vFileName"></param>
        /// <param name="playFile"></param>
        /// <param name="imgFile"></param>
        /// <returns></returns>
        public string MChangeFilePhy(string vFileName, string playFile, string imgFile)
        {
            string tool = Server.MapPath(mencodertool);
            //string mplaytool = Server.MapPath(PublicMethod.ffmpegtool);

            if ((!System.IO.File.Exists(tool)) || (!System.IO.File.Exists(vFileName)))
            {
                return "";
            }

string flv_file = System.IO.Path.ChangeExtension(playFile, ".flv");

//截图的尺寸大小,配置在Web.Config中,如:<add key="CatchFlvImgSize" value="240x180" />
string FlvImgSize =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);
                return CatchImg(flv_file, imgFile);
            }
            catch
            {
                return "";
            }
        }
        #endregion

}
}