C#使用MediaInfo查看媒体信息

1.将MediaInfo.dll放入可执行目录。

2.将官网Demo里的MediaInfoDLL.cs放入项目中。（http://mediainfo.sourceforge.net/en/Download/Windows有官方的示例代码，你也可以到讨论区http://sourceforge.net/projects/mediainfo/forums/forum/297610
http://code.google.com/hosting/search?q=mediainfo&projectsearch=Search+projects
上也有很多基于mediainfo的开发项目）

/*  Copyright (c) MediaArea.net SARL. All Rights Reserved.
 *
 *  Use of this source code is governed by a BSD-style license that can
 *  be found in the License.html file in the root of the source tree.
 */

//+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
//
// Microsoft Visual C# wrapper for MediaInfo Library
// See MediaInfo.h for help
//
// To make it working, you must put MediaInfo.Dll
// in the executable folder
//
//+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++

using System;
using System.Runtime.InteropServices;

#pragma warning disable 1591 // Disable XML documentation warnings

namespace MediaInfoLib
{
    public enum StreamKind
    {
        General,
        Video,
        Audio,
        Text,
        Other,
        Image,
        Menu,
    }

    public enum InfoKind
    {
        Name,
        Text,
        Measure,
        Options,
        NameText,
        MeasureText,
        Info,
        HowTo
    }

    public enum InfoOptions
    {
        ShowInInform,
        Support,
        ShowInSupported,
        TypeOfValue
    }

    public enum InfoFileOptions
    {
        FileOption_Nothing      = 0x00,
        FileOption_NoRecursive  = 0x01,
        FileOption_CloseAll     = 0x02,
        FileOption_Max          = 0x04
    };

    public enum Status
    {
        None        =       0x00,
        Accepted    =       0x01,
        Filled      =       0x02,
        Updated     =       0x04,
        Finalized   =       0x08,
    }

    public class MediaInfo
    {
        //Import of DLL functions. DO NOT USE until you know what you do (MediaInfo DLL do NOT use CoTaskMemAlloc to allocate memory)
        [DllImport("MediaInfo.dll")]
        private static extern IntPtr MediaInfo_New();
        [DllImport("MediaInfo.dll")]
        private static extern void   MediaInfo_Delete(IntPtr Handle);
        [DllImport("MediaInfo.dll")]
        private static extern IntPtr MediaInfo_Open(IntPtr Handle, [MarshalAs(UnmanagedType.LPWStr)] string FileName);
        [DllImport("MediaInfo.dll")]
        private static extern IntPtr MediaInfoA_Open(IntPtr Handle, IntPtr FileName);
        [DllImport("MediaInfo.dll")]
        private static extern IntPtr MediaInfo_Open_Buffer_Init(IntPtr Handle, Int64 File_Size, Int64 File_Offset);
        [DllImport("MediaInfo.dll")]
        private static extern IntPtr MediaInfoA_Open(IntPtr Handle, Int64 File_Size, Int64 File_Offset);
        [DllImport("MediaInfo.dll")]
        private static extern IntPtr MediaInfo_Open_Buffer_Continue(IntPtr Handle, IntPtr Buffer, IntPtr Buffer_Size);
        [DllImport("MediaInfo.dll")]
        private static extern IntPtr MediaInfoA_Open_Buffer_Continue(IntPtr Handle, Int64 File_Size, byte[] Buffer, IntPtr Buffer_Size);
        [DllImport("MediaInfo.dll")]
        private static extern Int64  MediaInfo_Open_Buffer_Continue_GoTo_Get(IntPtr Handle);
        [DllImport("MediaInfo.dll")]
        private static extern Int64  MediaInfoA_Open_Buffer_Continue_GoTo_Get(IntPtr Handle);
        [DllImport("MediaInfo.dll")]
        private static extern IntPtr MediaInfo_Open_Buffer_Finalize(IntPtr Handle);
        [DllImport("MediaInfo.dll")]
        private static extern IntPtr MediaInfoA_Open_Buffer_Finalize(IntPtr Handle);
        [DllImport("MediaInfo.dll")]
        private static extern void   MediaInfo_Close(IntPtr Handle);
        [DllImport("MediaInfo.dll")]
        private static extern IntPtr MediaInfo_Inform(IntPtr Handle, IntPtr Reserved);
        [DllImport("MediaInfo.dll")]
        private static extern IntPtr MediaInfoA_Inform(IntPtr Handle, IntPtr Reserved);
        [DllImport("MediaInfo.dll")]
        private static extern IntPtr MediaInfo_GetI(IntPtr Handle, IntPtr StreamKind, IntPtr StreamNumber, IntPtr Parameter, IntPtr KindOfInfo);
        [DllImport("MediaInfo.dll")]
        private static extern IntPtr MediaInfoA_GetI(IntPtr Handle, IntPtr StreamKind, IntPtr StreamNumber, IntPtr Parameter, IntPtr KindOfInfo);
        [DllImport("MediaInfo.dll")]
        private static extern IntPtr MediaInfo_Get(IntPtr Handle, IntPtr StreamKind, IntPtr StreamNumber, [MarshalAs(UnmanagedType.LPWStr)] string Parameter, IntPtr KindOfInfo, IntPtr KindOfSearch);
        [DllImport("MediaInfo.dll")]
        private static extern IntPtr MediaInfoA_Get(IntPtr Handle, IntPtr StreamKind, IntPtr StreamNumber, IntPtr Parameter, IntPtr KindOfInfo, IntPtr KindOfSearch);
        [DllImport("MediaInfo.dll")]
        private static extern IntPtr MediaInfo_Option(IntPtr Handle, [MarshalAs(UnmanagedType.LPWStr)] string Option, [MarshalAs(UnmanagedType.LPWStr)] string Value);
        [DllImport("MediaInfo.dll")]
        private static extern IntPtr MediaInfoA_Option(IntPtr Handle, IntPtr Option,  IntPtr Value);
        [DllImport("MediaInfo.dll")]
        private static extern IntPtr MediaInfo_State_Get(IntPtr Handle);
        [DllImport("MediaInfo.dll")]
        private static extern IntPtr MediaInfo_Count_Get(IntPtr Handle, IntPtr StreamKind, IntPtr StreamNumber);

        //MediaInfo class
        public MediaInfo()
        {
            try
            {
                Handle = MediaInfo_New();
            }
            catch
            {
                Handle = (IntPtr)0;
            }
            if (Environment.OSVersion.ToString().IndexOf("Windows") == -1)
                MustUseAnsi=true;
            else
                MustUseAnsi=false;
        }
        ~MediaInfo() { if (Handle == (IntPtr)0) return; MediaInfo_Delete(Handle); }
        public int Open(String FileName)
        {
            if (Handle == (IntPtr)0)
                return 0;
            if (MustUseAnsi)
            {
                IntPtr FileName_Ptr = Marshal.StringToHGlobalAnsi(FileName);
                int ToReturn = (int)MediaInfoA_Open(Handle, FileName_Ptr);
                Marshal.FreeHGlobal(FileName_Ptr);
                return ToReturn;
            }
            else
                return (int)MediaInfo_Open(Handle, FileName);
        }
        public int Open_Buffer_Init(Int64 File_Size, Int64 File_Offset)
        {
            if (Handle == (IntPtr)0) return 0; return (int)MediaInfo_Open_Buffer_Init(Handle, File_Size, File_Offset);
        }
        public int Open_Buffer_Continue(IntPtr Buffer, IntPtr Buffer_Size)
        {
            if (Handle == (IntPtr)0) return 0; return (int)MediaInfo_Open_Buffer_Continue(Handle, Buffer, Buffer_Size);
        }
        public Int64 Open_Buffer_Continue_GoTo_Get()
        {
            if (Handle == (IntPtr)0) return 0; return (Int64)MediaInfo_Open_Buffer_Continue_GoTo_Get(Handle);
        }
        public int Open_Buffer_Finalize()
        {
            if (Handle == (IntPtr)0) return 0; return (int)MediaInfo_Open_Buffer_Finalize(Handle);
        }
        public void Close() { if (Handle == (IntPtr)0) return; MediaInfo_Close(Handle); }
        public String Inform()
        {
            if (Handle == (IntPtr)0)
                return "Unable to load MediaInfo library";
            if (MustUseAnsi)
                return Marshal.PtrToStringAnsi(MediaInfoA_Inform(Handle, (IntPtr)0));
            else
                return Marshal.PtrToStringUni(MediaInfo_Inform(Handle, (IntPtr)0));
        }
        public String Get(StreamKind StreamKind, int StreamNumber, String Parameter, InfoKind KindOfInfo, InfoKind KindOfSearch)
        {
            if (Handle == (IntPtr)0)
                return "Unable to load MediaInfo library";
            if (MustUseAnsi)
            {
                IntPtr Parameter_Ptr=Marshal.StringToHGlobalAnsi(Parameter);
                String ToReturn=Marshal.PtrToStringAnsi(MediaInfoA_Get(Handle, (IntPtr)StreamKind, (IntPtr)StreamNumber, Parameter_Ptr, (IntPtr)KindOfInfo, (IntPtr)KindOfSearch));
                Marshal.FreeHGlobal(Parameter_Ptr);
                return ToReturn;
            }
            else
                return Marshal.PtrToStringUni(MediaInfo_Get(Handle, (IntPtr)StreamKind, (IntPtr)StreamNumber, Parameter, (IntPtr)KindOfInfo, (IntPtr)KindOfSearch));
        }
        public String Get(StreamKind StreamKind, int StreamNumber, int Parameter, InfoKind KindOfInfo)
        {
            if (Handle == (IntPtr)0)
                return "Unable to load MediaInfo library";
            if (MustUseAnsi)
                return Marshal.PtrToStringAnsi(MediaInfoA_GetI(Handle, (IntPtr)StreamKind, (IntPtr)StreamNumber, (IntPtr)Parameter, (IntPtr)KindOfInfo));
            else
                return Marshal.PtrToStringUni(MediaInfo_GetI(Handle, (IntPtr)StreamKind, (IntPtr)StreamNumber, (IntPtr)Parameter, (IntPtr)KindOfInfo));
        }
        public String Option(String Option, String Value)
        {
            if (Handle == (IntPtr)0)
                return "Unable to load MediaInfo library";
            if (MustUseAnsi)
            {
                IntPtr Option_Ptr=Marshal.StringToHGlobalAnsi(Option);
                IntPtr Value_Ptr=Marshal.StringToHGlobalAnsi(Value);
                String ToReturn=Marshal.PtrToStringAnsi(MediaInfoA_Option(Handle, Option_Ptr, Value_Ptr));
                Marshal.FreeHGlobal(Option_Ptr);
                Marshal.FreeHGlobal(Value_Ptr);
                return ToReturn;
            }
            else
                return Marshal.PtrToStringUni(MediaInfo_Option(Handle, Option, Value));
        }
        public int State_Get() { if (Handle == (IntPtr)0) return 0; return (int)MediaInfo_State_Get(Handle); }
        public int Count_Get(StreamKind StreamKind, int StreamNumber) { if (Handle == (IntPtr)0) return 0; return (int)MediaInfo_Count_Get(Handle, (IntPtr)StreamKind, (IntPtr)StreamNumber); }
        private IntPtr Handle;
        private bool MustUseAnsi;

        //Default values, if you know how to set default values in C#, say me
        public String Get(StreamKind StreamKind, int StreamNumber, String Parameter, InfoKind KindOfInfo) { return Get(StreamKind, StreamNumber, Parameter, KindOfInfo, InfoKind.Name); }
        public String Get(StreamKind StreamKind, int StreamNumber, String Parameter) { return Get(StreamKind, StreamNumber, Parameter, InfoKind.Text, InfoKind.Name); }
        public String Get(StreamKind StreamKind, int StreamNumber, int Parameter) { return Get(StreamKind, StreamNumber, Parameter, InfoKind.Text); }
        public String Option(String Option_) { return Option(Option_, ""); }
        public int Count_Get(StreamKind StreamKind) { return Count_Get(StreamKind, -1); }
    }

















    public class MediaInfoList
    {
        //Import of DLL functions. DO NOT USE until you know what you do (MediaInfo DLL do NOT use CoTaskMemAlloc to allocate memory)
        [DllImport("MediaInfo.dll")]
        private static extern IntPtr MediaInfoList_New();
        [DllImport("MediaInfo.dll")]
        private static extern void MediaInfoList_Delete(IntPtr Handle);
        [DllImport("MediaInfo.dll")]
        private static extern IntPtr MediaInfoList_Open(IntPtr Handle, [MarshalAs(UnmanagedType.LPWStr)] string FileName, IntPtr Options);
        [DllImport("MediaInfo.dll")]
        private static extern void MediaInfoList_Close(IntPtr Handle, IntPtr FilePos);
        [DllImport("MediaInfo.dll")]
        private static extern IntPtr MediaInfoList_Inform(IntPtr Handle, IntPtr FilePos, IntPtr Reserved);
        [DllImport("MediaInfo.dll")]
        private static extern IntPtr MediaInfoList_GetI(IntPtr Handle, IntPtr FilePos, IntPtr StreamKind, IntPtr StreamNumber, IntPtr Parameter, IntPtr KindOfInfo);
        [DllImport("MediaInfo.dll")]
        private static extern IntPtr MediaInfoList_Get(IntPtr Handle, IntPtr FilePos, IntPtr StreamKind, IntPtr StreamNumber, [MarshalAs(UnmanagedType.LPWStr)] string Parameter, IntPtr KindOfInfo, IntPtr KindOfSearch);
        [DllImport("MediaInfo.dll")]
        private static extern IntPtr MediaInfoList_Option(IntPtr Handle, [MarshalAs(UnmanagedType.LPWStr)] string Option, [MarshalAs(UnmanagedType.LPWStr)] string Value);
        [DllImport("MediaInfo.dll")]
        private static extern IntPtr MediaInfoList_State_Get(IntPtr Handle);
        [DllImport("MediaInfo.dll")]
        private static extern IntPtr MediaInfoList_Count_Get(IntPtr Handle, IntPtr FilePos, IntPtr StreamKind, IntPtr StreamNumber);

        //MediaInfo class
        public MediaInfoList() { Handle = MediaInfoList_New(); }
        ~MediaInfoList() { MediaInfoList_Delete(Handle); }
        public int Open(String FileName, InfoFileOptions Options) { return (int)MediaInfoList_Open(Handle, FileName, (IntPtr)Options); }
        public void Close(int FilePos) { MediaInfoList_Close(Handle, (IntPtr)FilePos); }
        public String Inform(int FilePos) { return Marshal.PtrToStringUni(MediaInfoList_Inform(Handle, (IntPtr)FilePos, (IntPtr)0)); }
        public String Get(int FilePos, StreamKind StreamKind, int StreamNumber, String Parameter, InfoKind KindOfInfo, InfoKind KindOfSearch) { return Marshal.PtrToStringUni(MediaInfoList_Get(Handle, (IntPtr)FilePos, (IntPtr)StreamKind, (IntPtr)StreamNumber, Parameter, (IntPtr)KindOfInfo, (IntPtr)KindOfSearch)); }
        public String Get(int FilePos, StreamKind StreamKind, int StreamNumber, int Parameter, InfoKind KindOfInfo) { return Marshal.PtrToStringUni(MediaInfoList_GetI(Handle, (IntPtr)FilePos, (IntPtr)StreamKind, (IntPtr)StreamNumber, (IntPtr)Parameter, (IntPtr)KindOfInfo)); }
        public String Option(String Option, String Value) { return Marshal.PtrToStringUni(MediaInfoList_Option(Handle, Option, Value)); }
        public int State_Get() { return (int)MediaInfoList_State_Get(Handle); }
        public int Count_Get(int FilePos, StreamKind StreamKind, int StreamNumber) { return (int)MediaInfoList_Count_Get(Handle, (IntPtr)FilePos, (IntPtr)StreamKind, (IntPtr)StreamNumber); }
        private IntPtr Handle;

        //Default values, if you know how to set default values in C#, say me
        public void Open(String FileName) { Open(FileName, 0); }
        public void Close() { Close(-1); }
        public String Get(int FilePos, StreamKind StreamKind, int StreamNumber, String Parameter, InfoKind KindOfInfo) { return Get(FilePos, StreamKind, StreamNumber, Parameter, KindOfInfo, InfoKind.Name); }
        public String Get(int FilePos, StreamKind StreamKind, int StreamNumber, String Parameter) { return Get(FilePos, StreamKind, StreamNumber, Parameter, InfoKind.Text, InfoKind.Name); }
        public String Get(int FilePos, StreamKind StreamKind, int StreamNumber, int Parameter) { return Get(FilePos, StreamKind, StreamNumber, Parameter, InfoKind.Text); }
        public String Option(String Option_) { return Option(Option_, ""); }
        public int Count_Get(int FilePos, StreamKind StreamKind) { return Count_Get(FilePos, StreamKind, -1); }
    }

} //NameSpace

---- 以下2 个参考看

/*  Copyright (c) MediaArea.net SARL. All Rights Reserved.
 *
 *  Use of this source code is governed by a BSD-style license that can
 *  be found in the License.html file in the root of the source tree.
 */

//+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
//
// Microsoft Visual C# example
//
// To make this example working, you must put MediaInfo.Dll and Example.ogg
// in the "./Bin/__ConfigurationName__" folder
// and add MediaInfoDll.cs to your project
//
//+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++

using System;
using System.Drawing;
using System.Collections;
using System.ComponentModel;
using System.Windows.Forms;
using System.Data;
using System.Text;
using System.IO;
using MediaInfoLib;

namespace MediaInfoLib_MSCS
{
    /// <summary>
    /// Summary description for Form1.
    /// </summary>
    public class Form1 : System.Windows.Forms.Form
    {
        private System.Windows.Forms.RichTextBox richTextBox1;
        /// <summary>
        /// Required designer variable.
        /// </summary>
        private System.ComponentModel.Container components = null;

        public Form1()
        {
            //
            // Required for Windows Form Designer support
            //
            InitializeComponent();

            //
            // TODO: Add any constructor code after InitializeComponent call
            //
        }

        /// <summary>
        /// Clean up any resources being used.
        /// </summary>
        protected override void Dispose( bool disposing )
        {
            if( disposing )
            {
                if (components != null)
                {
                    components.Dispose();
                }
            }
            base.Dispose( disposing );
        }

        #region Windows Form Designer generated code
        /// <summary>
        /// Methode requise pour la prise en charge du concepteur - ne modifiez pas
        /// le contenu de cette méthode avec l'éditeur de code.
        /// </summary>
        private void InitializeComponent()
        {
            this.richTextBox1 = new System.Windows.Forms.RichTextBox();
            this.SuspendLayout();
            //
            // richTextBox1
            //
            this.richTextBox1.Location = new System.Drawing.Point(0, 0);
            this.richTextBox1.Name = "richTextBox1";
            this.richTextBox1.Size = new System.Drawing.Size(768, 512);
            this.richTextBox1.TabIndex = 0;
            this.richTextBox1.Text = "";
            //
            // Form1
            //
            this.ClientSize = new System.Drawing.Size(770, 514);
            this.Controls.Add(this.richTextBox1);
            this.FormBorderStyle = System.Windows.Forms.FormBorderStyle.Fixed3D;
            this.Name = "Form1";
            this.StartPosition = System.Windows.Forms.FormStartPosition.CenterScreen;
            this.Text = "How to use MediaInfo.Dll";
            this.Load += new System.EventHandler(this.Form1_Load);
            this.ResumeLayout(false);

        }
        #endregion

        /// <summary>
        /// The main entry point for the application.
        /// </summary>


        [STAThread]
        static void Main()
        {
            Application.Run(new Form1());
        }

        private void Form1_Load(object sender, System.EventArgs e)
        {
            //Test if version of DLL is compatible : 3rd argument is "version of DLL tested;Your application name;Your application version"
            String ToDisplay;
            MediaInfo MI = new MediaInfo();

            ToDisplay = MI.Option("Info_Version", "0.7.0.0;MediaInfoDLL_Example_CS;0.7.0.0");
            if (ToDisplay.Length == 0)
            {
                richTextBox1.Text = "MediaInfo.Dll: this version of the DLL is not compatible";
                return;
            }

            //Information about MediaInfo
            ToDisplay += "

Info_Parameters
";
            ToDisplay += MI.Option("Info_Parameters");

            ToDisplay += "

Info_Capacities
";
            ToDisplay += MI.Option("Info_Capacities");

            ToDisplay += "

Info_Codecs
";
            ToDisplay += MI.Option("Info_Codecs");

            //An example of how to use the library
            ToDisplay += "

Open
";
            MI.Open("Example.ogg");

            ToDisplay += "

Inform with Complete=false
";
            MI.Option("Complete");
            ToDisplay += MI.Inform();

            ToDisplay += "

Inform with Complete=true
";
            MI.Option("Complete", "1");
            ToDisplay += MI.Inform();

            ToDisplay += "

Custom Inform
";
            MI.Option("Inform", "General;File size is %FileSize% bytes");
            ToDisplay += MI.Inform();

            ToDisplay += "

Get with Stream=General and Parameter='FileSize'
";
            ToDisplay += MI.Get(0, 0, "FileSize");

            ToDisplay += "

Get with Stream=General and Parameter=46
";
            ToDisplay += MI.Get(0, 0, 46);

            ToDisplay += "

Count_Get with StreamKind=Stream_Audio
";
            ToDisplay += MI.Count_Get(StreamKind.Audio);

            ToDisplay += "

Get with Stream=General and Parameter='AudioCount'
";
            ToDisplay += MI.Get(StreamKind.General, 0, "AudioCount");

            ToDisplay += "

Get with Stream=Audio and Parameter='StreamCount'
";
            ToDisplay += MI.Get(StreamKind.Audio, 0, "StreamCount");

            ToDisplay += "

Close
";
            MI.Close();

            //Example with a stream
            //ToDisplay+="
"+ExampleWithStream()+"
";

            //Displaying the text
            richTextBox1.Text = ToDisplay;
        }

        String ExampleWithStream()
        {
            //Initilaizing MediaInfo
            MediaInfo MI = new MediaInfo();

            //From: preparing an example file for reading
            FileStream From = new FileStream("Example.ogg", FileMode.Open, FileAccess.Read);

            //From: preparing a memory buffer for reading
            byte[] From_Buffer = new byte[64*1024];
            int    From_Buffer_Size; //The size of the read file buffer

            //Preparing to fill MediaInfo with a buffer
            MI.Open_Buffer_Init(From.Length, 0);

            //The parsing loop
            do
            {
                //Reading data somewhere, do what you want for this.
                From_Buffer_Size = From.Read(From_Buffer, 0, 64 * 1024);

                //Sending the buffer to MediaInfo
                System.Runtime.InteropServices.GCHandle GC = System.Runtime.InteropServices.GCHandle.Alloc(From_Buffer, System.Runtime.InteropServices.GCHandleType.Pinned);
                IntPtr From_Buffer_IntPtr = GC.AddrOfPinnedObject();
                Status Result = (Status)MI.Open_Buffer_Continue(From_Buffer_IntPtr, (IntPtr)From_Buffer_Size);
                GC.Free();
                if ((Result & Status.Finalized) == Status.Finalized)
                    break;

                //Testing if MediaInfo request to go elsewhere
                if (MI.Open_Buffer_Continue_GoTo_Get() != -1)
                {
                    Int64 Position = From.Seek(MI.Open_Buffer_Continue_GoTo_Get(), SeekOrigin.Begin); //Position the file
                    MI.Open_Buffer_Init(From.Length, Position); //Informing MediaInfo we have seek
                }
            }
            while (From_Buffer_Size > 0);

            //Finalizing
            MI.Open_Buffer_Finalize(); //This is the end of the stream, MediaInfo must finnish some work

            //Get() example
            return "Container format is " + MI.Get(StreamKind.General, 0, "Format");
        }
    }
}

/*  Copyright (c) MediaArea.net SARL. All Rights Reserved.
 *
 *  Use of this source code is governed by a BSD-style license that can
 *  be found in the License.html file in the root of the source tree.
 */

//+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
//
// Microsoft Visual C# example
//
// To make this example working, you must put MediaInfo.Dll and Example.ogg
// in the "./Bin/__ConfigurationName__" folder
// and add MediaInfoDll.cs to your project
//
//+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++

using System;
using MediaInfoLib;

namespace MediaInfoLib_MSCS
{
    public class CLI
    {
        [STAThread]
        static void Main(string[] Args)
        {
            String ToDisplay;
            MediaInfo MI = new MediaInfo();

            ToDisplay = MI.Option("Info_Version", "0.7.0.0;MediaInfoDLL_Example_CS;0.7.0.0");
            if (ToDisplay.Length == 0)
            {
                Console.Out.WriteLine("MediaInfo.Dll: this version of the DLL is not compatible");
                return;
            }

            //Information about MediaInfo
            ToDisplay += "

Info_Parameters
";
            ToDisplay += MI.Option("Info_Parameters");

            ToDisplay += "

Info_Capacities
";
            ToDisplay += MI.Option("Info_Capacities");

            ToDisplay += "

Info_Codecs
";
            ToDisplay += MI.Option("Info_Codecs");

            //An example of how to use the library
            ToDisplay += "

Open
";
            String File_Name;
            if (Args.Length == 0)
                File_Name = "Example.ogg";
            else
                File_Name = Args[0];
            MI.Open(File_Name);

            ToDisplay += "

Inform with Complete=false
";
            MI.Option("Complete");
            ToDisplay += MI.Inform();

            ToDisplay += "

Inform with Complete=true
";
            MI.Option("Complete", "1");
            ToDisplay += MI.Inform();

            ToDisplay += "

Custom Inform
";
            MI.Option("Inform", "General;File size is %FileSize% bytes");
            ToDisplay += MI.Inform();

            ToDisplay += "

Get with Stream=General and Parameter='FileSize'
";
            ToDisplay += MI.Get(0, 0, "FileSize");

            ToDisplay += "

Get with Stream=General and Parameter=46
";
            ToDisplay += MI.Get(0, 0, 46);

            ToDisplay += "

Count_Get with StreamKind=Stream_Audio
";
            ToDisplay += MI.Count_Get(StreamKind.Audio);

            ToDisplay += "

Get with Stream=General and Parameter='AudioCount'
";
            ToDisplay += MI.Get(StreamKind.General, 0, "AudioCount");

            ToDisplay += "

Get with Stream=Audio and Parameter='StreamCount'
";
            ToDisplay += MI.Get(StreamKind.Audio, 0, "StreamCount");

            ToDisplay += "

Close
";
            MI.Close();

            //Displaying the text
            Console.Out.WriteLine(ToDisplay);
        }
    }
}

---

3.接下来是调用了。

//0.视频StreamKind.Video,音频参数StreamKind.Audio,全局参数StreamKind.General Parameter
            MediaInfo MI = new MediaInfo();
            MI.Open("E:\Downloads\测试音频03.mp3");
            //1.
            string width = MI.Get(StreamKind.Video, 0, "Width");//视频width
            string height = MI.Get(StreamKind.Video, 0, "Height");
            string s1 = MI.Inform();
            //2.
            MI.Option("Inform", "General;%Duration%");
            string durationL = MI.Inform();
            //3.
            //MI.Option("Info_Parameters");
            string s = MI.Get(StreamKind.Audio, 0, "Duration");//音频时长
            MI.Close();
            //4.
            StringBuilder sb = new StringBuilder();
            sb.Append("用mediainfo.dll计算时长：" + TimeSpan.FromMilliseconds(Convert.ToDouble(s)));

出现"Unable to load MediaInfo library",肯能是DLL 不成功，(可能版本高或者注册下)

4.由MI.Get(StreamKind.Video, 0, "Width")这个函数调用方式可知，我们想查询视频宽度，直接使用width参数就行了，但是视频、音频有大量的参数，我们不可以都猜的到，网上反正我没找到这些参数的介绍，幸好找到了一个方法可以把这些方法遍历出来，参数出来了，就好办了，不明白意思的话google下，基本上就可以把全部参数弄懂了。

// 遍历Video所有可有参数
//如果要遍历Audio的参数，StreamKind.Video换成StreamKind.Audio即可，General同理。
string parameter="";//存放所有参数
string tempstr;int i=0;
while (true)
{
    tempstr = MI.Get(StreamKind.Video, 0, i++, InfoKind.Name);
    if (tempstr == "") 
      {
       break;
      }
    parameter += "
" + tempstr;
}

转  获取参数：http://www.cnblogs.com/royzou/archive/2011/09/06/mediainfo_parameter.html

http://www.cnblogs.com/dudu837/p/4534350.html

http://www.cnblogs.com/grenet/p/3222731.html