在做視頻項目時一般是把視頻轉換爲flv格式進行播放，還會在上傳的時候對視頻進行截圖以顯示此視頻。爲了方便大家，提供C#(asp.net)上傳視頻轉換爲flv格式並給視頻截圖代碼。
以下代碼是在添加視頻的操作代碼：
string fileName = PublicMethod.GetFileName(_files[i].FileName);// GetFileName();
string upFileName = Server.MapPath(PublicMethod.upFile + fileName);
_files[i].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(_files[i].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);
//pm.CatchImg(upFileName, imgFile);
}
else if (Extension == "mencoder")
{
pm.MChangeFilePhy(upFileName, playFile, imgFile);
pm.CatchImg(upFileName, imgFile);
}
else if (Extension == "error")
{
Page.ClientScript.RegisterStartupScript(this.GetType(), "error", "<script language='javascript'>alert('不支持此視頻格式的上傳!');location.href('AddVideo.aspx');</script>");
}
string VideoUrl = PublicMethod.upFile + fileName;
string VideoFlvUrl = PublicMethod.playFile + saveName + ".flv";
string VideoImg = PublicMethod.imgFile + saveName + ".jpg";
ProductImage = VideoUrl + "," + VideoFlvUrl + "," + VideoImg;
PublicMethod類詳細代碼：
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;
namespace Company.COMM
{
public class PublicMethod
{
public PublicMethod()
{
//
// TODO: 在此處添加構造函數邏輯
//
}
//文件路徑
public static string ffmpegtool ="../../ffmpeg/ffmpeg.exe";
public static string mencodertool = "../../mencoder/mencoder.exe";
public static string upFile = "../../UpFiles" + "/";
public static string imgFile = "../../ImgFile" + "/";
public static string playFile = "../../PlayFiles" + "/";
//文件圖片大小
public static string sizeOfImg = "240x180";
//文件大小
public static string widthOfFile = "400";
public static string heightOfFile = "350";
// // //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:\aspx1\ffmpeg.exe" />
string ffmpeg = HttpContext.Current.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 = HttpContext.Current.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:\aspx1\ffmpeg.exe" />
string ffmpeg = HttpContext.Current.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(HttpContext.Current.Server.MapPath(imgFile), ".jpg");
string flv_file = System.IO.Path.ChangeExtension(HttpContext.Current.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 = HttpContext.Current.Server.MapPath(PublicMethod.mencodertool);
//string mplaytool = HttpContext.Current.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
}
}
把上述代碼直接進行復制既可實現C#(asp.net)上傳視頻轉換爲flv格式並給視頻截圖。