asp.net 在線上傳視頻（把其他格式轉化爲flv格式）

首先，我們部署一下文件夾.在工程的目錄下新建幾個文件夾如下

UpFiles，ffmpeg，mencoder，mencoder，UpFiles，ImgFile
UpFiles文件夾是要保存你上傳的文件，PlayFiles文件夾是用於你轉換後保存的文件（用於網上播放）
ImgFile文件夾是保存截取視頻文件的圖片，然後那兩個mencoder和ffmpeg文件夾是視頻轉換工具.此視頻轉換也
可叫做mencoder+ffmpeg視頻轉換.
首先，在配置文件中給這些文件夾進行路徑的配置.如下

<appSettings>
<!--工具文件夾-->
<add key="ffmpeg" value="ffmpeg/ffmpeg.exe"/>
<add key="mencoder" value="mencoder/mencoder.exe"/>
<add key="mplayer" value="mencoder/mplayer.exe"/>
<!--上傳文件的路徑-->
<add key="upfile" value="UpFiles"/>
<!--上專文件圖片路徑-->
<add key="imgfile" value="ImgFile"/>
<!--上傳文件圖片大小-->
<add key="CatchFlvImgSize" value="240x180"/>
<add key="widthSize" value="400"/>
<add key="heightSize" value="350"/>
<!--轉換後文件路徑-->
<add key="playfile" value="PlayFiles"/>
</appSettings>

在上傳.ASPX頁面中

<httpRuntime useFullyQualifiedRedirectUrl="false" maxRequestLength="51400" executionTimeout="300"/>限制上傳文件的大小，1M=1028，50M=51400

標題：
<asp:FileUpload ID="FileUpload1" runat="server" Width="339px" />
<asp:Button ID="btnUpload" runat="server" OnClick="btnUpload_Click" Text="上傳視頻" Width="70px" />
文件類型<span style="color:Red;">(.asf|.flv|.avi|.mpg|.3gp|.mov|.wmv|.rm|.rmvb)</span>
<asp:RegularExpressionValidator ID="imagePathValidator" runat="server" ErrorMessage="文件類型不正確"
ValidationGroup="vgValidation" Display="Dynamic" ValidationExpression="^[a-zA-Z]:(\\.+)(.asf|.flv|.avi|.mpg|.3gp|.mov|.wmv|.rm|.rmvb){$article$}quot;
ControlToValidate="FileUpload1">
</asp:RegularExpressionValidator>
<asp:RequiredFieldValidator ID="RequiredFieldValidator1" runat="server" ControlToValidate="FileUpload1"
ErrorMessage="文件不爲空"></asp:RequiredFieldValidator></div>
<div style=" height:0px; border-top:solid 1px red; font-size:0px;"></div>
<div>上傳列表.</div>

程序工作的原理是：視頻先上傳上去，然後跟着就是開始轉換.
所以.在CS 文件中有
這裏爲了方便我是用sqlDatasource數據控件做數據的操作.
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;
public partial class _Default : System.Web.UI.Page 
{
// 擴展名定義
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")
{//直接拷貝到播放文件夾下
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 插入數據到數據庫中
private void InsertData(string MediaName,string fileName,string saveName)
{
//string name=fileName.Substring(0, fileName.LastIndexOf(.));
string imgName = saveName + ".jpg";//圖片文件名;
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
}
PublicMethod類如下：
在這個類裏面主要是做文件轉換和保存，在轉換文件的時候CPU的利用率可以達100%.
它的主要原理是另起一個進程在轉換的時候你會發現你的進程裏多了一個.
using System;
using System.Configuration;
/// <summary>
/// Summary description for PublicMethod
/// </summary>
public class PublicMethod:System.Web.UI.Page
{
public PublicMethod()
{
}
//文件路徑
public static string ffmpegtool = ConfigurationManager.AppSettings["ffmpeg"];
public static string mencodertool = ConfigurationManager.AppSettings["mencoder"];
public static string mplayertool = ConfigurationManager.AppSettings["mplayer"];
public static string upFile = ConfigurationManager.AppSettings["upfile"] + "/";
public static string imgFile = ConfigurationManager.AppSettings["imgfile"] + "/";
public static string playFile = ConfigurationManager.AppSettings["playfile"] + "/";
//文件圖片大小
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"];
// // //獲取文件的名字
public static string GetFileName(string fileName)
{
int i = fileName.LastIndexOf("\\") + 1;
string Name = fileName.Substring(i);
return Name;
}
//獲取文件擴展名
public static string GetExtension(string fileName)
{
int i = fileName.LastIndexOf(".")+1;
string Name = fileName.Substring(i);
return Name;
}
//
#region //運行FFMpeg的視頻解碼，(這裏是絕對路徑)
/// <summary>
/// 轉換文件並保存在指定文件夾下面(這裏是絕對路徑)
/// </summary>
/// <param name="fileName">上傳視頻文件的路徑（原文件）</param>
/// <param name="playFile">轉換後的文件的路徑（網絡播放文件）</param>
/// <param name="imgFile">從視頻文件中抓取的圖片路徑</param>
/// <returns>成功:返回圖片虛擬地址; 失敗:返回空字符串</returns>
public string ChangeFilePhy(string fileName, string playFile, string imgFile)
{
//取得ffmpeg.exe的路徑,路徑配置在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 "";
}
//獲得圖片和(.flv)文件相對路徑/最後存儲到數據庫的路徑,如:/Web/User1/00001.jpg 
string flv_file = System.IO.Path.ChangeExtension(playFile, ".flv");

//截圖的尺寸大小,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
{
//轉換
System.Diagnostics.Process.Start(FilestartInfo);
//截圖
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 //運行FFMpeg的視頻解碼，(這裏是(虛擬)相對路徑)
/// <summary>
/// 轉換文件並保存在指定文件夾下面(這裏是相對路徑)
/// </summary>
/// <param name="fileName">上傳視頻文件的路徑（原文件）</param>
/// <param name="playFile">轉換後的文件的路徑（網絡播放文件）</param>
/// <param name="imgFile">從視頻文件中抓取的圖片路徑</param>
/// <returns>成功:返回圖片虛擬地址; 失敗:返回空字符串</returns>
public string ChangeFileVir(string fileName, string playFile, string imgFile)
{
//取得ffmpeg.exe的路徑,路徑配置在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 "";
}
//獲得圖片和(.flv)文件相對路徑/最後存儲到數據庫的路徑,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");

//截圖的尺寸大小,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;
//此處組合成ffmpeg.exe文件需要的參數即可,此處命令在ffmpeg 0.4.9調試通過 
//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:圖片截取成功後,數據由內存緩存寫到磁盤需要時間較長,大概在3,4秒甚至更長; 
///這兒需要延時後再檢測,我服務器延時8秒,即如果超過8秒圖片仍不存在,認爲截圖失敗; 
///此處略去延時代碼.如有那位知道如何捕捉ffmpeg.exe截圖失敗消息,請告知,先謝過! 
if (System.IO.File.Exists(flv_img))
{
return flv_img;
}
return "";
}
#endregion
#region //運行mencoder的視頻解碼器轉換(這裏是(絕對路徑))
public string 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");

//截圖的尺寸大小,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
}