C#调用mmpeg进行各种视频转换的类实例
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
usingSystem.Web;
usingSystem.Configuration;
namespaceDotNet.Utilities
{
//if(this.fload.HasFile)
//{
//stringupFileName=HttpContext.Current.Server.MapPath("~/savefile")+"\\"+this.fload.PostedFile.FileName;
//stringsaveName=DateTime.Now.ToString("yyyyMMddHHmmssffff");
//stringplayFile=Server.MapPath(VideoConvert.savefile+saveName);
//stringimgFile=Server.MapPath(VideoConvert.savefile+saveName);
//VideoConvertpm=newVideoConvert();
//stringm_strExtension=VideoConvert.GetExtension(this.fload.PostedFile.FileName).ToLower();
//if(m_strExtension=="flv")
//{
//System.IO.File.Copy(upFileName,playFile+".flv");
//pm.CatchImg(upFileName,imgFile);
//}
//stringExtension=pm.CheckExtension(m_strExtension);
//if(Extension=="ffmpeg")
//{
//pm.ChangeFilePhy(upFileName,playFile,imgFile);
//}
//elseif(Extension=="mencoder")
//{
//pm.MChangeFilePhy(upFileName,playFile,imgFile);
//}
//}
publicclassVideoConvert:System.Web.UI.Page
{
publicVideoConvert()
{}
string[]strArrMencoder=newstring[]{"wmv","rmvb","rm"};
string[]strArrFfmpeg=newstring[]{"asf","avi","mpg","3gp","mov"};
#region配置
publicstaticstringffmpegtool=ConfigurationManager.AppSettings["ffmpeg"];
publicstaticstringmencodertool=ConfigurationManager.AppSettings["mencoder"];
publicstaticstringsavefile=ConfigurationManager.AppSettings["savefile"]+"/";
publicstaticstringsizeOfImg=ConfigurationManager.AppSettings["CatchFlvImgSize"];
publicstaticstringwidthOfFile=ConfigurationManager.AppSettings["widthSize"];
publicstaticstringheightOfFile=ConfigurationManager.AppSettings["heightSize"];
#endregion
#region获取文件的名字
///<summary>
///获取文件的名字
///</summary>
publicstaticstringGetFileName(stringfileName)
{
inti=fileName.LastIndexOf("\\")+1;
stringName=fileName.Substring(i);
returnName;
}
#endregion
#region获取文件扩展名
///<summary>
///获取文件扩展名
///</summary>
publicstaticstringGetExtension(stringfileName)
{
inti=fileName.LastIndexOf(".")+1;
stringName=fileName.Substring(i);
returnName;
}
#endregion
#region获取文件类型
///<summary>
///获取文件类型
///</summary>
publicstringCheckExtension(stringextension)
{
stringm_strReturn="";
foreach(stringvarinthis.strArrFfmpeg)
{
if(var==extension)
{
m_strReturn="ffmpeg";break;
}
}
if(m_strReturn=="")
{
foreach(stringvarinstrArrMencoder)
{
if(var==extension)
{
m_strReturn="mencoder";break;
}
}
}
returnm_strReturn;
}
#endregion
#region视频格式转为Flv
///<summary>
///视频格式转为Flv
///</summary>
///<paramname="vFileName">原视频文件地址</param>
///<paramname="ExportName">生成后的Flv文件地址</param>
publicboolConvertFlv(stringvFileName,stringExportName)
{
if((!System.IO.File.Exists(ffmpegtool))||(!System.IO.File.Exists(HttpContext.Current.Server.MapPath(vFileName))))
{
returnfalse;
}
vFileName=HttpContext.Current.Server.MapPath(vFileName);
ExportName=HttpContext.Current.Server.MapPath(ExportName);
stringCommand="-i\""+vFileName+"\"-y-ab32-ar22050-b800000-s480*360\""+ExportName+"\"";//Flv格式
System.Diagnostics.Processp=newSystem.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();
returntrue;
}
#endregion
#region生成Flv视频的缩略图
///<summary>
///生成Flv视频的缩略图
///</summary>
///<paramname="vFileName">视频文件地址</param>
publicstringCatchImg(stringvFileName)
{
if((!System.IO.File.Exists(ffmpegtool))||(!System.IO.File.Exists(HttpContext.Current.Server.MapPath(vFileName))))return"";
try
{
stringflv_img_p=vFileName.Substring(0,vFileName.Length-4)+".jpg";
stringCommand="-i"+HttpContext.Current.Server.MapPath(vFileName)+"-y-fimage2-t0.1-s"+sizeOfImg+""+HttpContext.Current.Server.MapPath(flv_img_p);
System.Diagnostics.Processp=newSystem.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)))
{
returnflv_img_p;
}
return"";
}
catch
{
return"";
}
}
#endregion
#region运行FFMpeg的视频解码(绝对路径)
///<summary>
///转换文件并保存在指定文件夹下
///</summary>
///<paramname="fileName">上传视频文件的路径（原文件）</param>
///<paramname="playFile">转换后的文件的路径（网络播放文件）</param>
///<paramname="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>
publicstringChangeFilePhy(stringfileName,stringplayFile,stringimgFile)
{
stringffmpeg=Server.MapPath(VideoConvert.ffmpegtool);
if((!System.IO.File.Exists(ffmpeg))||(!System.IO.File.Exists(fileName)))
{
return"";
}
stringflv_file=System.IO.Path.ChangeExtension(playFile,".flv");
stringFlvImgSize=VideoConvert.sizeOfImg;
System.Diagnostics.ProcessStartInfoFilestartInfo=newSystem.Diagnostics.ProcessStartInfo(ffmpeg);
FilestartInfo.WindowStyle=System.Diagnostics.ProcessWindowStyle.Hidden;
FilestartInfo.Arguments="-i"+fileName+"-ab56-ar22050-b500-r15-s"+widthOfFile+"x"+heightOfFile+""+flv_file;
try
{
System.Diagnostics.Process.Start(FilestartInfo);//转换
CatchImg(fileName,imgFile);//截图
}
catch
{
return"";
}
return"";
}
publicstringCatchImg(stringfileName,stringimgFile)
{
stringffmpeg=Server.MapPath(VideoConvert.ffmpegtool);
stringflv_img=imgFile+".jpg";
stringFlvImgSize=VideoConvert.sizeOfImg;
System.Diagnostics.ProcessStartInfoImgstartInfo=newSystem.Diagnostics.ProcessStartInfo(ffmpeg);
ImgstartInfo.WindowStyle=System.Diagnostics.ProcessWindowStyle.Hidden;
ImgstartInfo.Arguments="-i"+fileName+"-y-fimage2-ss2-vframes1-s"+FlvImgSize+""+flv_img;
try
{
System.Diagnostics.Process.Start(ImgstartInfo);
}
catch
{
return"";
}
if(System.IO.File.Exists(flv_img))
{
returnflv_img;
}
return"";
}
#endregion
#region运行FFMpeg的视频解码(相对路径)
///<summary>
///转换文件并保存在指定文件夹下
///</summary>
///<paramname="fileName">上传视频文件的路径（原文件）</param>
///<paramname="playFile">转换后的文件的路径（网络播放文件）</param>
///<paramname="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>
publicstringChangeFileVir(stringfileName,stringplayFile,stringimgFile)
{
stringffmpeg=Server.MapPath(VideoConvert.ffmpegtool);
if((!System.IO.File.Exists(ffmpeg))||(!System.IO.File.Exists(fileName)))
{
return"";
}
stringflv_img=System.IO.Path.ChangeExtension(Server.MapPath(imgFile),".jpg");
stringflv_file=System.IO.Path.ChangeExtension(Server.MapPath(playFile),".flv");
stringFlvImgSize=VideoConvert.sizeOfImg;
System.Diagnostics.ProcessStartInfoImgstartInfo=newSystem.Diagnostics.ProcessStartInfo(ffmpeg);
ImgstartInfo.WindowStyle=System.Diagnostics.ProcessWindowStyle.Hidden;
ImgstartInfo.Arguments="-i"+fileName+"-y-fimage2-t0.001-s"+FlvImgSize+""+flv_img;
System.Diagnostics.ProcessStartInfoFilestartInfo=newSystem.Diagnostics.ProcessStartInfo(ffmpeg);
FilestartInfo.WindowStyle=System.Diagnostics.ProcessWindowStyle.Hidden;
FilestartInfo.Arguments="-i"+fileName+"-ab56-ar22050-b500-r15-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))
{
returnflv_img;
}
return"";
}
#endregion
#region运行mencoder的视频解码器转换(绝对路径)
///<summary>
///运行mencoder的视频解码器转换
///</summary>
publicstringMChangeFilePhy(stringvFileName,stringplayFile,stringimgFile)
{
stringtool=Server.MapPath(VideoConvert.mencodertool);
if((!System.IO.File.Exists(tool))||(!System.IO.File.Exists(vFileName)))
{
return"";
}
stringflv_file=System.IO.Path.ChangeExtension(playFile,".flv");
stringFlvImgSize=VideoConvert.sizeOfImg;
System.Diagnostics.ProcessStartInfoFilestartInfo=newSystem.Diagnostics.ProcessStartInfo(tool);
FilestartInfo.WindowStyle=System.Diagnostics.ProcessWindowStyle.Hidden;
FilestartInfo.Arguments=""+vFileName+"-o"+flv_file+"-oflavf-lavfoptsi_certify_that_my_video_stream_does_not_use_b_frames-oacmp3lame-lameoptsabr:br=56-ovclavc-lavcoptsvcodec=flv:vbitrate=200:mbd=2:mv0:trell:v4mv:cbp:last_pred=1:dia=-1:cmp=0:vb_strategy=1-vfscale="+widthOfFile+":"+heightOfFile+"-ofps12-srate22050";
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。