asp.net上传视频自动生成缩略图

[freexiaoyu]

asp.net上传视频自动生成缩略图

[SeerMi]

缩略图代码：
ImageThumbnail.cs
using System;
using System.IO;
using System.Drawing;
using System.Drawing.Imaging;

public class ImageThumbnail
{
public Image ResourceImage;
private int ImageWidth;
private int ImageHeight;
public string ErrorMessage;

public ImageThumbnail(string ImageFileName)
{
ResourceImage = Image.FromFile(ImageFileName);
ErrorMessage = "";
}

public bool ThumbnailCallback()
{
return false;
}


// 方法1，按大小
public bool ReducedImage(int Width, int Height, string targetFilePath)
{
try
{
Image ReducedImage;
Image.GetThumbnailImageAbort callb = new Image.GetThumbnailImageAbort(ThumbnailCallback);
ReducedImage = ResourceImage.GetThumbnailImage(Width, Height, callb, IntPtr.Zero);
ReducedImage.Save(@targetFilePath, ImageFormat.Jpeg);
ReducedImage.Dispose();
return true;
}
catch (Exception e)
{
ErrorMessage = e.Message;
return false;
}
}


// 方法2，按百分比 缩小60% Percent为0.6 targetFilePath为目标路径
public bool ReducedImage(double Percent, string targetFilePath)
{
try
{
Image ReducedImage;
Image.GetThumbnailImageAbort callb = new Image.GetThumbnailImageAbort(ThumbnailCallback);
ImageWidth = Convert.ToInt32(ResourceImage.Width * Percent);
ImageHeight = (ResourceImage.Height)*ImageWidth/ ResourceImage.Width;//等比例缩放
ReducedImage = ResourceImage.GetThumbnailImage(ImageWidth, ImageHeight, callb, IntPtr.Zero);
ReducedImage.Save(@targetFilePath, ImageFormat.Jpeg);
ReducedImage.Dispose();
return true;
}
catch (Exception e)
{
ErrorMessage = e.Message;
return false;
}
}


}

后台代码：
using System;
using System.Data;
using System.Configuration;
using System.Collections;
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
{

protected void Page_Load(object sender, EventArgs e)
{

}
protected void bt_upload_Click(object sender, EventArgs e)
{
try
{
if (FileUpload1.PostedFile.FileName == "")
{
this.lb_info.Text = "请选择文件！";
}
else
{
string filepath = FileUpload1.PostedFile.FileName;
string filename = filepath.Substring(filepath.LastIndexOf("\") + 1);
string serverpath1 = Server.MapPath("images/") + filename;
string serverpath2 = Server.MapPath("images/") + System.DateTime.Now.ToString("yyy-MM-dd-hh-mm-ss") + Session.SessionID + filename;
FileUpload1.PostedFile.SaveAs(serverpath1);
ImageThumbnail img = new ImageThumbnail(filepath);
img.ReducedImage(0.4, serverpath2);//0.4表示缩小40%
this.lb_info.Text = "上传成功！";
}
}
catch (Exception error)
{
this.lb_info.Text = "上传发生错误！原因：" + error.ToString();
}
}


}

[SeerMi]

这个代码你修改后,img.ReducedImage(100,200, serverpath2) 可用,就是说,定制宽高的可用,那个按照比例的,不好用,你可以修改一下 :) ,我也是在网上看到的

[freexiaoyu]

这个是上传图片吧，
那视频呢

[SeerMi]

视频自动生成缩放??

有那么狠的方法?

[Animatrix]

楼上的，有这个方法的
具体我也不是很记得了
我是看一个英文的BLOG的时候看到的
当时也没收藏起来
现在找不到了，遗憾了，帮顶

[sjsoo]

晕列 人家说的是视频 要调用 ffmpeg这个文件 执行这个exe文件来抓图滴
上次做过代码在公司

[Animatrix]

ffmpeg -i video.flv -an -ss 00:00:03 -t 00:00:01 -r 1 -y -s 320x240 video%d.jpg
-ss record start time
-t record end time last for
So if you want to save frame 4 (00:00:04) -ss 00:00:03 -t 00:00:01.
Note: it is count from 00:00:00.
Even you want to save one jpg, you still need to use %d for naming,
it is strange that I grab one frame for one second,
it will return two identical jpg files for me