C#开发FFMPEG（API方式） FFmpeg拉取RTMP流并播放

网上C#调用FFmpeg的API例子很少，大多是C/C++的，因为ffmpeg.autogen的名称与FFmpeg完全一样，所以C#中可以直接复制C/C++代码，然后在FFmpeg的方法前加入 ffmpeg. 即可。

using System;
using System.IO;
using System.Runtime.InteropServices;

namespace FFmpegDemo
{
    public class FFmpegBinariesHelper
    {
        private const string LD_LIBRARY_PATH = “LD_LIBRARY_PATH“;

        internal static void RegisterFFmpegBinaries（）
        {
            switch （Environment.OSVersion.Platform）
            {
                case PlatformID.Win32NT:
                case PlatformID.Win32S:
                case PlatformID.Win32Windows:
                    var current = Environment.CurrentDirectory;
                    var probe = $“FFmpeg/bin/{（Environment.Is64BitProcess ? @“x64“ : @“x86“）}“;
                    while （current != null）
                    {
                        var ffmpegDirectory = Path.Combine（current probe）;
                        if （Directory.Exists（ffmpegDirectory））
                        {
                            Console.WriteLine（$“FFmpeg binaries found in: {ffmpegDirectory}“）;
                            RegisterLibrariesSearchPath（ffmpegDirectory）;
                            return;
                        }
                        current = Directory.GetParent（current）?.FullName;
                    }
                    break;
                case PlatformID.Unix:
                case PlatformID.MacOSX:
                    var libraryPath = Environment.GetEnvironmentVariable（LD_LIBRARY_PATH）;
                    RegisterLibrariesSearchPath（libraryPath）;
                    break;
            }
        }
        private static void RegisterLibrariesSearchPath（string path）
        {
            switch （Environment.OSVersion.Platform）
            {
                case PlatformID.Win32NT:
                case PlatformID.Win32S:
                case PlatformID.Win32Windows:
                    SetDllDirectory（path）;
                    break;
                case PlatformID.Unix:
                case PlatformID.MacOSX:
                    string currentValue = Environment.GetEnvironmentVariable（LD_LIBRARY_PATH）;
                    if （string.IsNullOrWhiteSpace（currentValue） == false && currentValue.Contains（path） == false）
                    {
                        string newValue = currentValue + Path.PathSeparator + path;
                        Environment.SetEnvironmentVariable（LD_LIBRARY_PATH newValue）;
                    }
                    break;
            }
        }
        
        [DllImport（“kernel32“ SetLastError = true）]
        private static extern bool SetDllDirectory（string lpPathName）;
    }
}

 属性            大小     日期    时间   名称
----------- ---------  ---------- -----  ----

     文件        187  2018-09-12 12:26  FFmpegDemo\FFmpegDemo\App.config

     文件   25478656  2017-11-13 05:32  FFmpegDemo\FFmpegDemo\bin\FFmpeg\bin\x64\avcodec-57.dll

     文件    1433088  2017-11-13 05:32  FFmpegDemo\FFmpegDemo\bin\FFmpeg\bin\x64\avdevice-57.dll

     文件    6795776  2017-11-13 05:32  FFmpegDemo\FFmpegDemo\bin\FFmpeg\bin\x64\avfilter-6.dll

     文件    3971584  2017-11-13 05:32  FFmpegDemo\FFmpegDemo\bin\FFmpeg\bin\x64\avformat-57.dll

     文件     687104  2017-11-13 05:32  FFmpegDemo\FFmpegDemo\bin\FFmpeg\bin\x64\avutil-55.dll

     文件     126464  2017-11-13 05:32  FFmpegDemo\FFmpegDemo\bin\FFmpeg\bin\x64\postproc-54.dll

     文件     377344  2017-11-13 05:32  FFmpegDemo\FFmpegDemo\bin\FFmpeg\bin\x64\swresample-2.dll

     文件     528896  2017-11-13 05:32  FFmpegDemo\FFmpegDemo\bin\FFmpeg\bin\x64\swscale-4.dll

     文件   22285824  2017-10-16 13:22  FFmpegDemo\FFmpegDemo\bin\FFmpeg\bin\x86\avcodec-57.dll

     文件    1208320  2017-10-16 13:22  FFmpegDemo\FFmpegDemo\bin\FFmpeg\bin\x86\avdevice-57.dll

     文件    6437376  2017-10-16 13:22  FFmpegDemo\FFmpegDemo\bin\FFmpeg\bin\x86\avfilter-6.dll

     文件    3991552  2017-10-16 13:22  FFmpegDemo\FFmpegDemo\bin\FFmpeg\bin\x86\avformat-57.dll

     文件     693248  2017-10-16 13:22  FFmpegDemo\FFmpegDemo\bin\FFmpeg\bin\x86\avutil-55.dll

     文件     297984  2017-10-16 13:22  FFmpegDemo\FFmpegDemo\bin\FFmpeg\bin\x86\ffmpeg.exe

     文件     147968  2017-10-16 13:22  FFmpegDemo\FFmpegDemo\bin\FFmpeg\bin\x86\ffplay.exe

     文件     162816  2017-10-16 13:22  FFmpegDemo\FFmpegDemo\bin\FFmpeg\bin\x86\ffprobe.exe

     文件     116224  2017-10-16 13:22  FFmpegDemo\FFmpegDemo\bin\FFmpeg\bin\x86\postproc-54.dll

     文件     324096  2017-10-16 13:22  FFmpegDemo\FFmpegDemo\bin\FFmpeg\bin\x86\swresample-2.dll

     文件     504320  2017-10-16 13:22  FFmpegDemo\FFmpegDemo\bin\FFmpeg\bin\x86\swscale-4.dll

     文件     217771  2017-11-13 05:32  FFmpegDemo\FFmpegDemo\bin\FFmpeg\include\libavcodec\avcodec.h

     文件       2570  2017-11-13 05:32  FFmpegDemo\FFmpegDemo\bin\FFmpeg\include\libavcodec\avdct.h

     文件       3111  2017-11-13 05:32  FFmpegDemo\FFmpegDemo\bin\FFmpeg\include\libavcodec\avfft.h

     文件       2853  2017-11-13 05:32  FFmpegDemo\FFmpegDemo\bin\FFmpeg\include\libavcodec\d3d11va.h

     文件       4044  2017-11-13 05:32  FFmpegDemo\FFmpegDemo\bin\FFmpeg\include\libavcodec\dirac.h

     文件       3715  2017-11-13 05:32  FFmpegDemo\FFmpegDemo\bin\FFmpeg\include\libavcodec\dv_profile.h

     文件       2361  2017-11-13 05:32  FFmpegDemo\FFmpegDemo\bin\FFmpeg\include\libavcodec\dxva2.h

     文件       1650  2017-11-13 05:32  FFmpegDemo\FFmpegDemo\bin\FFmpeg\include\libavcodec\jni.h

     文件       2825  2017-11-13 05:32  FFmpegDemo\FFmpegDemo\bin\FFmpeg\include\libavcodec\mediacodec.h

     文件       3763  2017-11-13 05:32  FFmpegDemo\FFmpegDemo\bin\FFmpeg\include\libavcodec\qsv.h

............此处省略137个文件信息