在做视频项目时一般是把视频转换为flv格式进行播放，还会在上传的时候对视频进行截图以显示此视频。为了方便大家，提供C#(asp.net)上传视频转换为flv格式并给视频截图代码。
以下代码是在添加视频的操作代码：
string fileName = PublicMethod.GetFileName(_files[i].FileName);// GetFileName();
string upFileName = Server.MapPath(PublicMethod.upFile + fileName);
_files[i].SaveAs(upFileName);
string saveName = DateTime.Now.ToString("yyyyMMddHHmmssffff");
string playFile = Server.MapPath(PublicMethod.playFile + saveName);
string imgFile = Server.MapPath(PublicMethod.imgFile + saveName);
//System.IO.File.Copy(Server.MapPath(PublicMethod.playFile + "00000002.jpg"), Server.MapPath(PublicMethod.imgFile+"aa.jpg"));
PublicMethod pm = new PublicMethod();
string m_strExtension = PublicMethod.GetExtension(_files[i].FileName).ToLower();
if (m_strExtension == "flv")
{//直接拷贝到播放文件夹下
System.IO.File.Copy(upFileName, playFile + ".flv");
pm.CatchImg(upFileName, imgFile);
}
string Extension = CheckExtension(m_strExtension);
if (Extension == "ffmpeg")
{
pm.ChangeFilePhy(upFileName, playFile, imgFile);
//pm.CatchImg(upFileName, imgFile);
}
else if (Extension == "mencoder")
{
pm.MChangeFilePhy(upFileName, playFile, imgFile);
pm.CatchImg(upFileName, imgFile);
}
else if (Extension == "error")
{
Page.ClientScript.RegisterStartupScript(this.GetType(), "error", "<script language='javascript'>alert('不支持此视频格式的上传!');location.href('AddVideo.aspx');</script>");
}
string VideoUrl = PublicMethod.upFile + fileName;
string VideoFlvUrl = PublicMethod.playFile + saveName + ".flv";
string VideoImg = PublicMethod.imgFile + saveName + ".jpg";
ProductImage = VideoUrl + "," + VideoFlvUrl + "," + VideoImg;
PublicMethod类详细代码：
using System;
using System.Data;
using System.Configuration;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
namespace Company.COMM
{
public class PublicMethod
{
public PublicMethod()
{
//
// TODO: 在此处添加构造函数逻辑
//
}
//文件路径
public static string ffmpegtool ="../../ffmpeg/ffmpeg.exe";
public static string mencodertool = "../../mencoder/mencoder.exe";
public static string upFile = "../../UpFiles" + "/";
public static string imgFile = "../../ImgFile" + "/";
public static string playFile = "../../PlayFiles" + "/";
//文件图片大小
public static string sizeOfImg = "240x180";
//文件大小
public static string widthOfFile = "400";
public static string heightOfFile = "350";
// // //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 = HttpContext.Current.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;
//ImgstartInfo.Arguments = " -i " + fileName + " -y -f image2 -t 0.05 -s " + FlvImgSize + " " + flv_img;
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 = HttpContext.Current.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:\aspx1\ffmpeg.exe" />
string ffmpeg = HttpContext.Current.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(HttpContext.Current.Server.MapPath(imgFile), ".jpg");
string flv_file = System.IO.Path.ChangeExtension(HttpContext.Current.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 = HttpContext.Current.Server.MapPath(PublicMethod.mencodertool);
//string mplaytool = HttpContext.Current.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 -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
}
}
把上述代码直接进行复制既可实现C#(asp.net)上传视频转换为flv格式并给视频截图。如有疑问，可以官方技术社区(http://bbs.25yi.com)提问。
作者: 网站设计@ CMS系统
原载: 25亿企业网站管理系统
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