如何获取mp4文件的信息(h.264标准)

问题描述

我想获取mp4文件的一些信息(例如持续时间，文件大小，标题等)，我尝试使用Shell32，但它不支持mp4格式，我在网站上找到了一些dll，但是它们都不是COM组件，那么我尝试使用IBMToolkitForMpeg4SDK.jar，然后遇到一些问题线程主"中的异常java.net.MalformedURLException:无法识别的文件扩展名:

I want to get some information of an mp4 file(such as duration,file size,title and so on) , I try to use Shell32 , but it does not support mp4 format , I have found some dlls in the website , but all they are not COM component , then I try to use IBMToolkitForMpeg4SDK.jar , and then meets some problems Exception in thread "main" java.net.MalformedURLException: Unrecognized extension of file:

e:\1.mpeg at I4g.d(Unknown Source) at I4g.a(Unknown Source) at I4i.a(Unknown Source) at I4b.a(Unknown Source) at I4b.open(Unknown Source) at AVgenSample.getMp4Duration(AVgenSample.java:48) at AVgenSample.main(AVgenSample.java:36)

所以我想获取mp4文件的信息，任何人都有任何方法，请帮忙！全部解决！

So I want to get the information of mp4 file , anyone have any methods , please help!Thsnks all!

推荐答案

using System.Runtime.InteropServices;
using DirectShowLib;
using DirectShowLib.DES;

public static string GetDuration(string fileName)
            {
                var mediaDet = (IMediaDet)new MediaDet();
                DsError.ThrowExceptionForHR(mediaDet.put_Filename(fileName));

                // find the video stream in the file
                int index;
                var type = Guid.Empty;
                for (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;
                mediaDet.get_StreamLength(out mediaLength);
                //var frameCount = (int)(frameRate * mediaLength);
                //var duration = frameCount / frameRate;

                return mediaLength.ToString();
            }

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