本文实例讲述了c#调用mmpeg进行各种视频转换的类。分享给大家供大家参考。具体如下：
这个c#类封装了视频转换所需的各种方法，基本上是围绕着如何通过mmpeg工具来进行视频转换
using system.web;
using system.configuration;
namespace dotnet.utilities
{
//if (this.fload.hasfile)
//{
// string upfilename = httpcontext.current.server.mappath("~/savefile") "\\" this.fload.postedfile.filename;
// string savename = datetime.now.tostring("yyyymmddhhmmssffff");
// string playfile = server.mappath(videoconvert.savefile savename);
// string imgfile = server.mappath(videoconvert.savefile savename);
// videoconvert pm = new videoconvert();
// string m_strextension = videoconvert.getextension(this.fload.postedfile.filename).tolower();
// if (m_strextension == "flv")
// {
// system.io.file.copy(upfilename, playfile ".flv");
// pm.catchimg(upfilename, imgfile);
// }
// string extension = pm.checkextension(m_strextension);
// if (extension == "ffmpeg")
// {
// pm.changefilephy(upfilename, playfile, imgfile);
// }
// else if (extension == "mencoder")
// {
// pm.mchangefilephy(upfilename, playfile, imgfile);
// }
//}
public class videoconvert : system.web.ui.page
{
public videoconvert()
{ }
string[] strarrmencoder = new string[] { "wmv", "rmvb", "rm" };
string[] strarrffmpeg = new string[] { "asf", "avi", "mpg", "3gp", "mov" };
#region 配置
public static string ffmpegtool = configurationmanager.appsettings["ffmpeg"];
public static string mencodertool = configurationmanager.appsettings["mencoder"];
public static string savefile = configurationmanager.appsettings["savefile"] "/";
public static string sizeofimg = configurationmanager.appsettings["catchflvimgsize"];
public static string widthoffile = configurationmanager.appsettings["widthsize"];
public static string heightoffile = configurationmanager.appsettings["heightsize"];
#endregion
#region 获取文件的名字
///
/// 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;
}
#endregion
#region 获取文件扩展名
///
/// 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;
}
#endregion
#region 获取文件类型
///
/// 获取文件类型
///
public string checkextension(string extension)
{
string m_strreturn = "";
foreach (string var in this.strarrffmpeg)
{
if (var == extension)
{
m_strreturn = "ffmpeg"; break;
}
}
if (m_strreturn == "")
{
foreach (string var in strarrmencoder)
{
if (var == extension)
{
m_strreturn = "mencoder"; break;
}
}
}
return m_strreturn;
}
#endregion
#region 视频格式转为flv
///
/// 视频格式转为flv
///
/// 原视频文件地址
/// 生成后的flv文件地址
public bool convertflv(string vfilename, string exportname)
{
if ((!system.io.file.exists(ffmpegtool)) || (!system.io.file.exists(httpcontext.current.server.mappath(vfilename))))
{
return false;
}
vfilename = httpcontext.current.server.mappath(vfilename);
exportname = httpcontext.current.server.mappath(exportname);
string command = " -i \"" vfilename "\" -y -ab 32 -ar 22050 -b 800000 -s 480*360 \"" exportname "\""; //flv格式
system.diagnostics.process p = new system.diagnostics.process();
p.startinfo.filename = ffmpegtool;
p.startinfo.arguments = command;
p.startinfo.workingdirectory = httpcontext.current.server.mappath("~/tools/");
p.startinfo.useshellexecute = false;
p.startinfo.redirectstandardinput = true;
p.startinfo.redirectstandardoutput = true;
p.startinfo.redirectstandarderror = true;
p.startinfo.createnowindow = false;
p.start();
p.beginerrorreadline();
p.waitforexit();
p.close();
p.dispose();
return true;
}
#endregion
#region 生成flv视频的缩略图
///
/// 生成flv视频的缩略图
///
/// 视频文件地址
public string catchimg(string vfilename)
{
if ((!system.io.file.exists(ffmpegtool)) || (!system.io.file.exists(httpcontext.current.server.mappath(vfilename)))) return "";
try
{
string flv_img_p = vfilename.substring(0, vfilename.length - 4) ".jpg";
string command = " -i " httpcontext.current.server.mappath(vfilename) " -y -f image2 -t 0.1 -s " sizeofimg " " httpcontext.current.server.mappath(flv_img_p);
system.diagnostics.process p = new system.diagnostics.process();
p.startinfo.filename = ffmpegtool;
p.startinfo.arguments = command;
p.startinfo.windowstyle = system.diagnostics.processwindowstyle.normal;
try
{
p.start();
}
catch
{
return "";
}
finally
{
p.close();
p.dispose();
}
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(httpcontext.current.server.mappath(flv_img_p)))
{
return flv_img_p;
}
return "";
}
catch
{
return "";
}
}
#endregion
#region 运行ffmpeg的视频解码(绝对路径)
///
/// 转换文件并保存在指定文件夹下
///
/// 上传视频文件的路径（原文件）
/// 转换后的文件的路径（网络播放文件）
/// 从视频文件中抓取的图片路径
/// 成功:返回图片虚拟地址;失败:返回空字符串
public string changefilephy(string filename, string playfile, string imgfile)
{
string ffmpeg = server.mappath(videoconvert.ffmpegtool);
if ((!system.io.file.exists(ffmpeg)) || (!system.io.file.exists(filename)))
{
return "";
}
string flv_file = system.io.path.changeextension(playfile, ".flv");
string flvimgsize = videoconvert.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
{
system.diagnostics.process.start(filestartinfo);//转换
catchimg(filename, imgfile); //截图
}
catch
{
return "";
}
return "";
}
public string catchimg(string filename, string imgfile)
{
string ffmpeg = server.mappath(videoconvert.ffmpegtool);
string flv_img = imgfile ".jpg";
string flvimgsize = videoconvert.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(相对路径)
///
/// 转换文件并保存在指定文件夹下
///
/// 上传视频文件的路径（原文件）
/// 转换后的文件的路径（网络播放文件）
/// 从视频文件中抓取的图片路径
/// 成功:返回图片虚拟地址;失败:返回空字符串
public string changefilevir(string filename, string playfile, string imgfile)
{
string ffmpeg = server.mappath(videoconvert.ffmpegtool);
if ((!system.io.file.exists(ffmpeg)) || (!system.io.file.exists(filename)))
{
return "";
}
string flv_img = system.io.path.changeextension(server.mappath(imgfile), ".jpg");
string flv_file = system.io.path.changeextension(server.mappath(playfile), ".flv");
string flvimgsize = videoconvert.sizeofimg;
system.diagnostics.processstartinfo imgstartinfo = new system.diagnostics.processstartinfo(ffmpeg);
imgstartinfo.windowstyle = system.diagnostics.processwindowstyle.hidden;
imgstartinfo.arguments = " -i " filename " -y -f image2 -t 0.001 -s " flvimgsize " " flv_img;
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
{
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;
if (system.io.file.exists(flv_img))
{
return flv_img;
}
return "";
}
#endregion
#region 运行mencoder的视频解码器转换(绝对路径)
///
/// 运行mencoder的视频解码器转换
///
public string mchangefilephy(string vfilename, string playfile, string imgfile)
{
string tool = server.mappath(videoconvert.mencodertool);
if ((!system.io.file.exists(tool)) || (!system.io.file.exists(vfilename)))
{
return "";
}
string flv_file = system.io.path.changeextension(playfile, ".flv");
string flvimgsize = videoconvert.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
}
}
希望本文所述对大家的c#程序设计有所帮助。
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