C#实现通过ffmpeg从flv视频文件中截图的方法
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2023-12-13 10:09:10
本文实例讲述了c#实现通过ffmpeg从flv视频文件中截图的方法。分享给大家供大家参考。具体分析如下：
需要先下载ffmpeg，这是开源的，代码如下所示：
复制代码...
本文实例讲述了c#实现通过ffmpeg从flv视频文件中截图的方法。分享给大家供大家参考。具体分析如下：
需要先下载ffmpeg，这是开源的，代码如下所示：
复制代码 代码如下:
using system;
using system.configuration;
public class publicmethod:system.web.ui.page
{
public publicmethod()
{
}
//文件路径
public static string ffmpegtool = "ffmpeg/ffmpeg.exe";
public static string mencodertool = "mencoder/mencoder.exe";
public static string flvtool = "flvtool/flvtool2.exe";//flv标记工具
public static string upfile = "upfiles" + "/";//上传文件夹
public static string imgfile = "imgfile" + "/";//图片文件夹
public static string playfile = "playfiles" + "/";//flv文件夹
public static string xmlfile = "xmlfiles" + "/";//xml文件夹
public static string sizeofimg = "240x180";//图片的宽与高
public static string widthoffile = "400";//flv文件的宽度
public static string heightoffile = "350";//flv文件的高度
//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
private system.timers.timer mytimer = new system.timers.timer(3000);//记时器
public static string flvname = "";
public static string imgname = "";
public static string flvxml = "";
public static int pid = 0;
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 void 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:aspx1ffmpeg.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;
//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
{
}
}
#endregion
#region 截图
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 "";
}
//
catchflvtool(filename);
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 void 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(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);
filestartinfo.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;
try
{
system.diagnostics.process ps = new system.diagnostics.process();
ps.startinfo = filestartinfo;
ps.start();
session.add("processid", ps.id);
session.add("flv", flv_file);
session.add("img", imgfile);
mytimer.elapsed += new system.timers.elapsedeventhandler(mytimer_test);
mytimer.enabled = true;
}
catch
{
}
}
#endregion
#region //运行mencoder的视频解码器转换(这里是(绝对路径))
public void 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 -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 ps = new system.diagnostics.process();
ps.startinfo = filestartinfo;
ps.start();
session.add("processid", ps.id);
session.add("flv", flv_file);
session.add("img", imgfile);
//pid = ps.id;
//flvname = flv_file;
//imgname = imgfile;
mytimer.elapsed += new system.timers.elapsedeventhandler(mytimer_test);
mytimer.enabled = true;
}
catch
{
}
}
/// <summary>
/// 记时器功能，自动保存截图
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void mytimer_test(object sender, system.timers.elapsedeventargs e)
{
if (!object.equals(null, session["processid"]))
{
try
{
system.diagnostics.process prs = system.diagnostics.process.getprocessbyid(int.parse(session["processid"].tostring()));
if (prs.hasexited)
{
catchimg(session["flv"].tostring(), session["img"].tostring());
catchflvtool(session["flv"].tostring());
mytimer.enabled = false;
mytimer.close();
mytimer.dispose();
session.abandon();
}
}
catch
{
catchimg(session["flv"].tostring(), session["img"].tostring());
catchflvtool(session["flv"].tostring());
mytimer.enabled = false;
mytimer.close();
mytimer.dispose();
session.abandon();
}
}
}
#endregion
public string catchflvtool(string filename)
{
//
string flvtools = server.mappath(publicmethod.flvtool);
//
string flv_xml = filename.replace(".flv", ".xml").replace(publicmethod.upfile.replace("/", ""), publicmethod.xmlfile.replace("/", ""));
//
system.diagnostics.processstartinfo imgstartinfo = new system.diagnostics.processstartinfo(flvtools);
imgstartinfo.windowstyle = system.diagnostics.processwindowstyle.hidden;
//
imgstartinfo.arguments = " " + filename + " -upx " + filename + " > " + flv_xml;
try
{
system.diagnostics.process.start(imgstartinfo);
}
catch
{
return "";
}
//
if (system.io.file.exists(flv_xml))
{
return flv_xml;
}
return "";
}
}
using system.configuration;
public class publicmethod:system.web.ui.page
{
public publicmethod()
{
}
//文件路径
public static string ffmpegtool = "ffmpeg/ffmpeg.exe";
public static string mencodertool = "mencoder/mencoder.exe";
public static string flvtool = "flvtool/flvtool2.exe";//flv标记工具
public static string upfile = "upfiles" + "/";//上传文件夹
public static string imgfile = "imgfile" + "/";//图片文件夹
public static string playfile = "playfiles" + "/";//flv文件夹
public static string xmlfile = "xmlfiles" + "/";//xml文件夹
public static string sizeofimg = "240x180";//图片的宽与高
public static string widthoffile = "400";//flv文件的宽度
public static string heightoffile = "350";//flv文件的高度
//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
private system.timers.timer mytimer = new system.timers.timer(3000);//记时器
public static string flvname = "";
public static string imgname = "";
public static string flvxml = "";
public static int pid = 0;
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 void 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:aspx1ffmpeg.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;
//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
{
}
}
#endregion
#region 截图
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 "";
}
//
catchflvtool(filename);
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 void 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(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);
filestartinfo.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;
try
{
system.diagnostics.process ps = new system.diagnostics.process();
ps.startinfo = filestartinfo;
ps.start();
session.add("processid", ps.id);
session.add("flv", flv_file);
session.add("img", imgfile);
mytimer.elapsed += new system.timers.elapsedeventhandler(mytimer_test);
mytimer.enabled = true;
}
catch
{
}
}
#endregion
#region //运行mencoder的视频解码器转换(这里是(绝对路径))
public void 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 -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 ps = new system.diagnostics.process();
ps.startinfo = filestartinfo;
ps.start();
session.add("processid", ps.id);
session.add("flv", flv_file);
session.add("img", imgfile);
//pid = ps.id;
//flvname = flv_file;
//imgname = imgfile;
mytimer.elapsed += new system.timers.elapsedeventhandler(mytimer_test);
mytimer.enabled = true;
}
catch
{
}
}
/// <summary>
/// 记时器功能，自动保存截图
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void mytimer_test(object sender, system.timers.elapsedeventargs e)
{
if (!object.equals(null, session["processid"]))
{
try
{
system.diagnostics.process prs = system.diagnostics.process.getprocessbyid(int.parse(session["processid"].tostring()));
if (prs.hasexited)
{
catchimg(session["flv"].tostring(), session["img"].tostring());
catchflvtool(session["flv"].tostring());
mytimer.enabled = false;
mytimer.close();
mytimer.dispose();
session.abandon();
}
}
catch
{
catchimg(session["flv"].tostring(), session["img"].tostring());
catchflvtool(session["flv"].tostring());
mytimer.enabled = false;
mytimer.close();
mytimer.dispose();
session.abandon();
}
}
}
#endregion
public string catchflvtool(string filename)
{
//
string flvtools = server.mappath(publicmethod.flvtool);
//
string flv_xml = filename.replace(".flv", ".xml").replace(publicmethod.upfile.replace("/", ""), publicmethod.xmlfile.replace("/", ""));
//
system.diagnostics.processstartinfo imgstartinfo = new system.diagnostics.processstartinfo(flvtools);
imgstartinfo.windowstyle = system.diagnostics.processwindowstyle.hidden;
//
imgstartinfo.arguments = " " + filename + " -upx " + filename + " > " + flv_xml;
try
{
system.diagnostics.process.start(imgstartinfo);
}
catch
{
return "";
}
//
if (system.io.file.exists(flv_xml))
{
return flv_xml;
}
return "";
}
}
希望本文所述对大家的c#程序设计有所帮助。