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asp.net下传视频截图

发布时间： 2013-02-24 17:58:57 作者： rapoo

asp.net上传视频截图
我做了一个视频上传的页面，可以截取视频的第一帧，发现好多视频截的图都是一样的，我想截取大约7分钟后的图片应该怎样修改
PublicMethod类如下：
using System;
using System.Configuration;
/// <summary>
/// Summary description for PublicMethod
/// </summary>
public class PublicMethod:System.Web.UI.Page
{
public PublicMethod()
{
}
//文件路径
public static string ffmpegtool = ConfigurationManager.AppSettings["ffmpeg"];
public static string mencodertool = ConfigurationManager.AppSettings["mencoder"];
public static string mplayertool = ConfigurationManager.AppSettings["mplayer"];
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:\51aspx\ffmpeg.exe" />
string ffmpeg = Server.MapPath(PublicMethod.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 = PublicMethod.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 {
//转换
System.Diagnostics.Process.Start(FilestartInfo);
//截图
CatchImg(fileName, imgFile);
//System.Diagnostics.Process.Start(ImgstartInfo);
}
catch {
return "";
}
//
return "";
}
//
public string CatchImg(string fileName,string imgFile)
{
//
string ffmpeg = Server.MapPath(PublicMethod.ffmpegtool);
//
string flv_img =imgFile+".jpg";
//
string FlvImgSize = PublicMethod.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 //运行FFMpeg的视频解码，(这里是(虚拟)相对路径)
/// <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:\51aspx\ffmpeg.exe" />
string ffmpeg = Server.MapPath(PublicMethod.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 = PublicMethod.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 //运行mencoder的视频解码器转换(这里是(绝对路径))
public string MChangeFilePhy(string vFileName, string playFile, string imgFile)
{
string tool = Server.MapPath(PublicMethod.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 = PublicMethod.sizeOfImg;
System.Diagnostics.ProcessStartInfo FilestartInfo = new System.Diagnostics.ProcessStartInfo(tool);
FilestartInfo.WindowStyle = System.Diagnostics.ProcessWindowStyle.Hidden;
FilestartInfo.Arguments = " " + vFileName + " -o " +


flv_file + " -of lavf -lavfoptsi_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
}

[解决办法]
我在做一个学校视频课程的项目,里面有视频截图. 调用的工具是 ffmpeg.exe


using System;
using System.Collections.Generic;
using System.Text;
using System.Diagnostics;

namespace YMHEdu.Utility
{
    public static class VideoCut
    {
        #region 公共属性

        /// <summary>
        /// 工具所在路径
        /// </summary>
        public static string ToolsPath { get; set; }
        /// <summary> 
        /// 截图起始时间段 格式 00:00:06
        /// </summary>
        public static string StartPoint { get; set; }
        /// <summary>
        /// 截图长度
        /// </summary>
        public static int CutImgWidth { get; set; }
        /// <summary>
        /// 截图宽度
        /// </summary>
        public static int CutImgHeight { get; set; }
        /// <summary>
        /// 截图文件格式
        /// </summary> 
 
        public static string CutImgExtend { get; set; }

        #endregion

        static VideoCut()
        {
            ToolsPath = System.Web.HttpContext.Current.Server.MapPath("~/Tools/ffmpeg.exe");
            StartPoint = "00:00:06";
            CutImgWidth = 500;
            CutImgHeight = 400;
            CutImgExtend = ".jpg";
        }
        public static bool Save(string strFullVideoFile)
        {
            //截图保存在同文件夹下面.名称仅扩展名不同
            string strOutputImg = strFullVideoFile.Substring(0, strFullVideoFile.LastIndexOf(".")) + CutImgExtend;
            return Save(strFullVideoFile, strOutputImg);
        }
        /// <summary>
        /// 保存截图
        /// </summary>
        /// <param name="strFullFileName"></param>
        public static bool Save(string strFullVideoFile, string strFullOutputImg)
        {
            return ExeCommand(ToolsPath + " -i " + strFullVideoFile + " -y -f image2 -ss " + StartPoint + " -t 0.001 -s " + CutImgWidth + "x" + CutImgHeight + " " + strFullOutputImg);
        }
        public static bool ExeCommand(string commandText)
        {
            return ExeCommand(new string[] { commandText });
        }
        public static bool ExeCommand(string[] commandTexts)
        {
            Process p = new Process();
            p.StartInfo.FileName = "cmd.exe";
            p.StartInfo.UseShellExecute = false;
            p.StartInfo.RedirectStandardInput = true;
            p.StartInfo.RedirectStandardOutput = true;
            p.StartInfo.RedirectStandardError = true;
            p.StartInfo.CreateNoWindow = true; 
 

            try
            {
                p.Start();
                foreach (string item in commandTexts)
                {
                    p.StandardInput.WriteLine(item);
                }
                p.StandardInput.WriteLine("exit");
                //strOutput = p.StandardOutput.ReadToEnd();
                p.WaitForExit();
                p.Close();

                return true;
            }
            catch (Exception e)
            {
                return false;//strOutput = e.Message;
            }
        }
    }
}

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