C#获取视频文件播放长度

下面两种方法只支持部分视频格式，一般格式mp3,wma等等支持

1.使用Shell32

添加引用，选择COM中的Microsoft Shell Controls And Automation引用

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/// <summary> /// 长度分钟(支持mp4?) /// </summary> /// <param name="path"></param> /// <returns></returns> public static string GetMediaTimeLenMinute(string path) {     try     {         Shell32.Shell shell = new Shell32.Shell();         //文件路径                       Shell32.Folder folder = shell.NameSpace(path.Substring(0, path.LastIndexOf("\\")));         //文件名称                     Shell32.FolderItem folderitem = folder.ParseName(path.Substring(path.LastIndexOf("\\") + 1));         if (Environment.OSVersion.Version.Major >= 6)         {             string mediaLength = folder.GetDetailsOf(folderitem, 27);             return mediaLength;         }         else         {             string mediaLength = folder.GetDetailsOf(folderitem, 21);             return mediaLength;         }     }     catch (Exception ex) { return null; } } /// <summary> /// 长度秒(支持mp4?) /// </summary> /// <param name="path"></param> /// <returns></returns> public static int GetMediaTimeLenSecond(string path) {     try     {         Shell32.Shell shell = new Shell32.Shell();         //文件路径                       Shell32.Folder folder = shell.NameSpace(path.Substring(0, path.LastIndexOf("\\")));         //文件名称                     Shell32.FolderItem folderitem = folder.ParseName(path.Substring(path.LastIndexOf("\\") + 1));         string len;         if (Environment.OSVersion.Version.Major >= 6)         {             len = folder.GetDetailsOf(folderitem, 27);         }         else         {             len = folder.GetDetailsOf(folderitem, 21);         }           string[] str = len.Split(new char[] { ':' });         int sum = 0;         sum = int.Parse(str[0]) * 60 * 60 + int.Parse(str[1]) * 60 + int.Parse(str[2]);           return sum;     }     catch (Exception ex) { return 0; } }

　　

 

1.使用DirectShowLib.dll

可在NuGet中搜索到DirectShowLib添加引用

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public static string GetMediaTimeLen(string path) {     var mediaDet = (IMediaDet)new MediaDet();     DsError.ThrowExceptionForHR(mediaDet.put_Filename(path));// find the video stream in the fileint index;     var type = Guid.Empty;     for (int index = 0; index < 1000 && type != MediaType.Video; index++)     {         mediaDet.put_CurrentStream(index);         mediaDet.get_StreamType(out type);     }     // retrieve some measurements from the video     double frameRate;     mediaDet.get_FrameRate(out frameRate);     var mediaType = new AMMediaType();     mediaDet.get_StreamMediaType(mediaType);     var videoInfo = (VideoInfoHeader)Marshal.PtrToStructure(mediaType.formatPtr, typeof(VideoInfoHeader));     DsUtils.FreeAMMediaType(mediaType);     var width = videoInfo.BmiHeader.Width;     var height = videoInfo.BmiHeader.Height;     double mediaLength;//这个是视频长度，单位秒     mediaDet.get_StreamLength(out mediaLength);     var frameCount = (int)(frameRate * mediaLength);     var duration = frameCount / frameRate;     return ""; }