C#上传视频生成缩略图

来源：互联网发布：admair 知乎编辑：程序博客网时间：2024/06/10 03:14

注意：需要FFmpeg软件，用到ffmpeg.exe；FFmpeg是一个开源免费跨平台的视频和音频流方案，属于自由软件，采用LGPL或GPL许可证（依据你选择的组件）。它提供了录制、转换以及流化音视频的完整解决方案。

FFmpeg下载地址：http://download.csdn.net/detail/liuwen718/8043651

前台代码

<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="WebForm1.aspx.cs" Inherits="WebApplication1.WebForm1" %>    <!DOCTYPE html>    <html xmlns="http://www.w3.org/1999/xhtml">  <head runat="server">  <meta http-equiv="Content-Type" content="text/html; charset=utf-8"/>      <title></title>  </head>  <body>      <form id="form1" runat="server">      <div>          <asp:FileUpload ID="FileUpload1" runat="server" />          <asp:Button ID="Button1" runat="server" Text="Button" OnClick="Button1_Click" />      </div>      </form>  </body>  </html>

后台代码

using System;using System.Collections.Generic;using System.IO;using System.Linq;using System.Web;using System.Web.UI;using System.Web.UI.WebControls;namespace WebApplication1{    public partial class WebForm1 : System.Web.UI.Page    {        protected void Page_Load(object sender, EventArgs e)        {        }        protected void Button1_Click(object sender, EventArgs e)        {            string imgfileExp = this.FileUpload1.PostedFile.FileName.Substring(this.FileUpload1.PostedFile.FileName.LastIndexOf(".") + 1);            string filename = "11223344";            string fileName = Path.GetFileName(FileUpload1.PostedFile.FileName);                      //文件名称            string fileExtension = Path.GetExtension(FileUpload1.PostedFile.FileName).ToLower();      //文件的后缀名(小写)            if (imgfileExp.ToLower() == "flv" || imgfileExp.ToLower() == "mp4")            {                Response.Write("uploadfile\\" + filename + "." + imgfileExp);                this.FileUpload1.PostedFile.SaveAs(Server.MapPath("uploadfile") + "\\" + fileName);                string ffmpeg = Server.MapPath("ffmpeg.exe");//E:\视频缩略图测试\html                string filenames = Server.MapPath("uploadfile") + "\\" + filename + "." + imgfileExp;                //Response.Write("<br/>" + this.CatchImg("uploadfile/" + filename + "." + imgfileExp));//可以使用                CatchImg1("/uploadfile/" + fileName);//可以使用经过整理            }        }        /// <summary>        /// 上传视频生成缩略图        /// </summary>        /// <param name="vFileName"></param>        /// <param name="SmallPic"></param>        /// <returns></returns>        public string CatchImg(string vFileName)        {            try            {                string ffmpeg = "ffmpeg.exe";                ffmpeg = Server.MapPath(ffmpeg);                string aaa = System.Web.HttpContext.Current.Server.MapPath(vFileName);                if ((!System.IO.File.Exists(ffmpeg)) || (!System.IO.File.Exists(System.Web.HttpContext.Current.Server.MapPath(vFileName))))                {                    return "";                }                //获得图片相对路径/最后存储到数据库的路径,如:/Web/FlvFile/User1/00001.jpg                string flv_img = System.IO.Path.ChangeExtension(vFileName, ".jpg");                //图片绝对路径,如:D:\Video\Web\FlvFile\User1\0001.jpg                string flv_img_p = Server.MapPath("/uploadfile/1.jpg");                //截图的尺寸大小,配置在Web.Config中,如:<add key="CatchFlvImgSize" value="140x110" />                 string FlvImgSize = "140x110";                System.Diagnostics.ProcessStartInfo startInfo = new System.Diagnostics.ProcessStartInfo(ffmpeg);                startInfo.WindowStyle = System.Diagnostics.ProcessWindowStyle.Normal;                //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                startInfo.Arguments = " -i " + Server.MapPath(vFileName) + " -y -f image2 -t 0.1 -s " + FlvImgSize + " " + flv_img_p;                try                {                    System.Diagnostics.Process.Start(startInfo);                }                catch                {                    return "";                }                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(flv_img_p))                {                    return flv_img_p.Replace(Server.MapPath("~/"), ""); ;                }                return "";            }            catch            {                return "";            }        }        /// <summary>        /// 上传视频生成缩略图        /// </summary>        /// <param name="vFileName"></param>        /// <param name="SmallPic"></param>        /// <returns></returns>        public string CatchImg1(string vFileName)        {            try            {                string ffmpeg = "/ffmpeg.exe";                ffmpeg = Server.MapPath(ffmpeg);                if ((!System.IO.File.Exists(ffmpeg)) || (!System.IO.File.Exists(Server.MapPath(vFileName))))                {                    return "";                }                string flv_img = System.IO.Path.ChangeExtension(vFileName, ".jpg");                string flv_img_p = Server.MapPath(flv_img);                string FlvImgSize = "140x110";                System.Diagnostics.ProcessStartInfo startInfo = new System.Diagnostics.ProcessStartInfo(ffmpeg);                startInfo.WindowStyle = System.Diagnostics.ProcessWindowStyle.Normal;                startInfo.Arguments = " -i " + Server.MapPath(vFileName) + " -y -f image2 -t 0.1 -s " + FlvImgSize + " " + flv_img_p;                try                {                    System.Diagnostics.Process.Start(startInfo);                }                catch                {                    return "";                }                System.Threading.Thread.Sleep(4000);                if (System.IO.File.Exists(flv_img_p))                {                    return flv_img_p.Replace(Server.MapPath("~/"), ""); ;                }                return "";            }            catch            {                return "";            }        }    }}

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