ASP中将视频文件转换成.flv格式

<appSettings>
<!--工具文件夹-->
<add key="ffmpeg" value="ffmpeg/ffmpeg.exe"/>
<add key="mencoder" value="mencoder/mencoder.exe"/>
<add key="mplayer" value="mencoder/mplayer.exe"/>
<!--上传文件的路径-->
<add key="upfile" value="UpFiles"/>
<!--上专文件图片路径-->
<add key="imgfile" value="ImgFile"/>
<!--上传文件图片大小-->
<add key="CatchFlvImgSize" value="240x180"/>
<add key="widthSize" value="400"/>
<add key="heightSize" value="350"/>
<!--转换后文件路径-->
<add key="playfile" value="PlayFiles"/>
</appSettings>在上传.ASPX页面中

标题：<asp:TextBox ID="txtTitle" runat="server" Width="358px"></asp:TextBox>
<asp:RequiredFieldValidator ID="RequiredFieldValidator2" runat="server" ControlToValidate="txtTitle"
ErrorMessage="标题不为空"></asp:RequiredFieldValidator>
<br />
<asp:FileUpload ID="FileUpload1" runat="server" Width="339px" />
<asp:Button ID="btnUpload" runat="server" OnClick="btnUpload_Click" Text="上传视频" Width="70px" />
文件类型<span style="color:Red;">(.asf　.flv　.avi　.mpg　.3gp　.mov　.wmv　.rm　.rmvb)</span>
<asp:RegularExpressionValidator ID="imagePathValidator" runat="server" ErrorMessage="文件类型不正确"
ValidationGroup="vgValidation" Display="Dynamic" ValidationExpression="^[a-zA-Z]:(\\.+)(.asf　.flv　.avi　.mpg　.3gp　.mov　.wmv　.rm　.rmvb)$"
ControlToValidate="FileUpload1">
</asp:RegularExpressionValidator>
<asp:RequiredFieldValidator ID="RequiredFieldValidator1" runat="server" ControlToValidate="FileUpload1"
ErrorMessage="文件不为空"></asp:RequiredFieldValidator></div>
<div style=" height:0px; border-top:solid 1px red; font-size:0px;"></div>

public partial class _Default : System.Web.UI.Page
{
// 扩展名定义
string[] strArrFfmpeg = new string[] {"asf","avi","mpg","3gp","mov" };
string[] strArrMencoder = new string[] {"wmv","rm","rmvb" };
protected void Page_Load(object sender, EventArgs e)
{

}
//
protected void btnUpload_Click(object sender, EventArgs e)
{

string upFileName = "";
if (this.FileUpload1.HasFile)
{
string fileName = PublicMethod.GetFileName(this.FileUpload1.FileName);// GetFileName();
if ((string)Session["file"] == fileName)
{
return;
}
upFileName = Server.MapPath(PublicMethod.upFile + fileName);
this.FileUpload1.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(this.FileUpload1.PostedFile.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);
}
else if (Extension == "mencoder")
{
pm.MChangeFilePhy(upFileName, playFile, imgFile);
}
InsertData(this.txtTitle.Text, fileName,saveName);
Session["file"] = fileName;
}

}

//
private 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;
}
#region 插入数据到数据库中
private void InsertData(string MediaName,string fileName,string saveName)
{
//string name=fileName.Substring(0, fileName.LastIndexOf('.'));
string imgName = saveName + ".jpg";//图片文件名;
string playName = saveName + ".flv";
string sqlstr = "insert into Media(FMediaName,FMediaUpPath,FMediaPlayPath,FMediaImgPath) values(@MName,@MUppath,@MPlaypath,@MImgpath)";
//string constr = ConfigurationManager.ConnectionStrings["sqlcon"].ToString();
SqlDataSource1.InsertCommand = sqlstr;
SqlDataSource1.InsertCommandType = SqlDataSourceCommandType.Text;// CommandType.Text;
SqlDataSource1.InsertParameters.Add("MName",MediaName);
SqlDataSource1.InsertParameters.Add("MUppath",PublicMethod.upFile+fileName);
SqlDataSource1.InsertParameters.Add("MPlaypath",PublicMethod.playFile+playName);
SqlDataSource1.InsertParameters.Add("MImgpath",PublicMethod.imgFile+imgName);
SqlDataSource1.Insert();
}
#endregion

}

/// <summary>
/// Summary description for PublicMethod
/// </summary>
public class PublicMethod:System.Web.UI.Page
{
public PublicMethod()
{

string flv_file = System.IO.Path.ChangeExtension(playFile, ".flv");

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 = 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:\51aspx\ffmpeg.exe" />
string ffmpeg = Server.MapPath(PublicMethod.ffmpegtool);
if ((!System.IO.File.Exists(ffmpeg)) 　　 (!System.IO.File.Exists(fileName)))
{
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