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

/// <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

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 "";
}