截取视频文件第一桢的图片和转换视频格式文件为flv(支持文件格式:asf,avi,mpg,flv,3gp,mov,wmv)
前段时间写过一篇抓取视频文件中图片的帖子,如下痛并努力着-在asp.net中如何从视频文件中抓取一桢并生成图像文件
另外一种方法是采用ffmpeg解码器,来实现如功能。
代码如下:
另外一种方法是采用ffmpeg解码器,来实现如功能。
代码如下:
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public class CatchFlv
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{
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public CatchFlv()
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{
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}
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/// <summary>
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/// @从视频文件截图,生成在视频文件所在文件夹
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/// 支持文件格式:asf,avi,mpg,flv,3gp,mov,wmv
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/// 在Web.Config 中需要两个前置配置项:
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/// 1.ffmpeg.exe文件的路径
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/// <add key="ffmpeg" value="\thread\ffmpeg\ffmpeg.exe" />
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/// 2.截图的尺寸大小
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/// <add key="CatchFlvImgSize" value="140x110" />
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/// 3.视频处理程序ffmpeg.exe
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/// </summary>
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/// <param name="vFileName">视频文件绝对或相对地址,如:(..)/Web/FlvFile/User1/001.avi</param>
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/// <returns>成功:返回图片绝对/相对地址; 失败:返回空字符串</returns>
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public static string CatchImg(string vFileName)
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{
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try
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{
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string ffmpeg = System.Configuration.ConfigurationSettings.AppSettings["ffmpeg"];
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ffmpeg = HttpContext.Current.Server.MapPath(ffmpeg);
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if ((!System.IO.File.Exists(ffmpeg)) || (!System.IO.File.Exists(System.Web.HttpContext.Current.Server.MapPath(vFileName))))
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{
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return "";
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}
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//获得图片相对路径/最后存储到数据库的路径,如:/Web/FlvFile/User1/00001.jpg
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string flv_img = System.IO.Path.ChangeExtension(vFileName, ".jpg");
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//图片绝对路径,如:D:\Video\Web\FlvFile\User1\0001.jpg
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string flv_img_p = HttpContext.Current.Server.MapPath(flv_img);
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//截图的尺寸大小,配置在Web.Config中,如:<add key="CatchFlvImgSize" value="140x110" />
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string FlvImgSize = System.Configuration.ConfigurationSettings.AppSettings["CatchFlvImgSize"];
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System.Diagnostics.ProcessStartInfo startInfo = new System.Diagnostics.ProcessStartInfo(ffmpeg);
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startInfo.WindowStyle = System.Diagnostics.ProcessWindowStyle.Normal;
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//此处组合成ffmpeg.exe文件需要的参数即可,此处命令在ffmpeg 0.4.9调试通过
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startInfo.Arguments = " -i " + System.Web.HttpContext.Current.Server.MapPath(vFileName) + " -y -f image2 -t 0.001 -s " + FlvImgSize + " " + flv_img_p;
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try
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{
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System.Diagnostics.Process.Start(startInfo);
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}
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catch
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{
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return "";
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}
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System.Threading.Thread.Sleep(4000);
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///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;
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if (System.IO.File.Exists(flv_img_p))
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{
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return flv_img;
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}
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return "";
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}
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catch
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{
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return "";
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}
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}
66![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
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/// <summary>
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/// @视频文件格式转换,生成在视频文件所在文件夹
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/// 支持文件格式:asf,avi,mpg,flv,3gp,mov,wmv
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/// 在Web.Config 中需要两个前置配置项:
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/// 1.ffmpeg.exe文件的路径
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/// <add key="ffmpeg" value="\thread\ffmpeg\ffmpeg.exe" />
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/// 2.截图的尺寸大小
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/// <add key="CatchFlvSize" value="240x180" />
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/// 3.视频处理程序ffmpeg.exe
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/// </summary>
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/// <param name="vFileName">视频文件绝对或相对地址,如:(..)/Web/FlvFile/User1/001.avi</param>
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/// <returns>成功:返回flv文件绝对/相对地址; 失败:返回空字符串</returns>
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public static string ChangeMediaFormat(string vFileName)
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{
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try
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{
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string ffmpeg = System.Configuration.ConfigurationSettings.AppSettings["ffmpeg"];
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string wks_url = System.Configuration.ConfigurationSettings.AppSettings["wks_local"];
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ffmpeg = wks_url+ffmpeg;
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if ((!System.IO.File.Exists(ffmpeg)) || (!System.IO.File.Exists(wks_url+vFileName)))
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{
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return "";
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}
90![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
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string flv_fot = System.IO.Path.ChangeExtension(vFileName, ".flv");
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string flv_fot_p = wks_url+flv_fot;
93![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
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//尺寸大小,配置在Web.Config中,如:<add key="CatchFlvSize" value="240x180" />
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string FlvImgSize = System.Configuration.ConfigurationSettings.AppSettings["CatchFlvSize"];
96![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
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System.Diagnostics.ProcessStartInfo startInfo = new System.Diagnostics.ProcessStartInfo(ffmpeg);
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startInfo.WindowStyle = System.Diagnostics.ProcessWindowStyle.Normal;
99![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
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//此处组合成ffmpeg.exe文件需要的参数即可,此处命令在ffmpeg 0.4.9调试通过
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startInfo.Arguments = " -i " + wks_url+vFileName + " -ab 56 -ar 22050 -b 500 -r 15 -s " + FlvImgSize + " " + flv_fot_p;
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try
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{
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System.Diagnostics.Process.Start(startInfo);
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}
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catch
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{
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return "";
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}
111![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
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///注意:文件格式转换成功后,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;
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System.Threading.Thread.Sleep(6000);
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if (System.IO.File.Exists(flv_fot_p))
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{
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WKS.Common.ImagesSet.DeleteOleImg(wks_url+vFileName);
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return flv_fot;
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}
119![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
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return "";
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}
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catch
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{
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return "";
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}
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}
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}
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但是,这种方法不知道ffmpeg什么时候生成结果,生成什么样的结果,因此也存在一定局限性.
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作者:jillzhang
出处:http://jillzhang.cnblogs.com/
本文版权归作者和博客园共有,欢迎转载,但未经作者同意必须保留此段声明,且在文章页面明显位置给出原文连接,否则保留追究法律责任的权利。
出处:http://jillzhang.cnblogs.com/
本文版权归作者和博客园共有,欢迎转载,但未经作者同意必须保留此段声明,且在文章页面明显位置给出原文连接,否则保留追究法律责任的权利。