在 Mono/Linux 中使用 FFmpeg.Autogen 4.1.0.2 时找不到 Kernel32

Question

我在 post 提交错误报告时不知道我可以从堆栈跟踪中看到 FFmpeg.Autogen。无论如何，我 post 在 Github

上提交了错误报告

https://github.com/Ruslan-B/FFmpeg.AutoGen/issues/109

我正在尝试运行我在 Linux 中使用 FFmpeg.Autogen 与 ffmpeg 库交互的代码。我越来越找不到 kernel32 dll 无法弄清楚为什么。他说不要 post 问题到 github 进行故障排除。可能的相关问题：https://github.com/Ruslan-B/FFmpeg.AutoGen/issues/89

我尝试的第一件事是从示例代码中包含二进制助手 class 我稍微调整了一下。添加了 linux 文件的确切路径。我做的第二件事是添加 FFmpeg.AutoGen.dll.config 如果配置正确，它会尝试引用一个 windows DLL，它应该指向 linux 一个。堆栈跟踪：

System.DllNotFoundException: kernel32
  at at (wrapper managed-to-native) FFmpeg.AutoGen.Native.WindowsNativeMethods.GetProcAddress(intptr,string)
  at FFmpeg.AutoGen.Native.FunctionLoader.GetFunctionPointer (System.IntPtr nativeLibraryHandle, System.String functionName) [0x00000] in D:\FFmpeg.AutoGen\FFmpeg.AutoGen\Native\FunctionLoader.cs:55
  at FFmpeg.AutoGen.Native.FunctionLoader.GetFunctionDelegate[T] (System.IntPtr nativeLibraryHandle, System.String functionName, System.Boolean throwOnError) [0x00000] in D:\FFmpeg.AutoGen\FFmpeg.AutoGen\Native\FunctionLoader.cs:28
  at FFmpeg.AutoGen.ffmpeg.GetFunctionDelegate[T] (System.IntPtr libraryHandle, System.String functionName) [0x00000] in D:\FFmpeg.AutoGen\FFmpeg.AutoGen\FFmpeg.cs:50
  at FFmpeg.AutoGen.ffmpeg+<>c.<.cctor>b__4_318 () [0x00000] in D:\FFmpeg.AutoGen\FFmpeg.AutoGen\FFmpeg.functions.export.g.cs:7163
  at FFmpeg.AutoGen.ffmpeg.avformat_alloc_context () [0x00000] in D:\FFmpeg.AutoGen\FFmpeg.AutoGen\FFmpeg.functions.export.g.cs:7176
  at FF8.FfccVaribleGroup..ctor () [0x0009c] in /home/robert/OpenVIII/FF8/FfccVaribleGroup.cs:53
  at FF8.Ffcc..ctor (System.String filename, FFmpeg.AutoGen.AVMediaType mediatype, FF8.Ffcc+FfccMode mode) [0x00008] in /home/robert/OpenVIII/FF8/Ffcc.cs:31
  at FF8.Module_movie_test.InitMovie () [0x00001] in /home/robert/OpenVIII/FF8/module_movie_test.cs:160
  at FF8.Module_movie_test.Update () [0x000c5] in /home/robert/OpenVIII/FF8/module_movie_test.cs:88
  at FF8.ModuleHandler.Update (Microsoft.Xna.Framework.GameTime gameTime) [0x000ac] in /home/robert/OpenVIII/FF8/ModuleHandler.cs:43
  at FF8.Game1.Update (Microsoft.Xna.Framework.GameTime gameTime) [0x00030] in /home/robert/OpenVIII/FF8/Game1.cs:69
  at Microsoft.Xna.Framework.Game.DoUpdate (Microsoft.Xna.Framework.GameTime gameTime) [0x00019] in <4fc8466c27384bb19c7b81b2a6a71083>:0
  at Microsoft.Xna.Framework.Game.Tick () [0x00103] in <4fc8466c27384bb19c7b81b2a6a71083>:0
  at Microsoft.Xna.Framework.SdlGamePlatform.RunLoop () [0x00021] in <4fc8466c27384bb19c7b81b2a6a71083>:0
  at Microsoft.Xna.Framework.Game.Run (Microsoft.Xna.Framework.GameRunBehavior runBehavior) [0x0008b] in <4fc8466c27384bb19c7b81b2a6a71083>:0
  at Microsoft.Xna.Framework.Game.Run () [0x0000c] in <4fc8466c27384bb19c7b81b2a6a71083>:0
  at FF8.Program.Main () [0x00007] in /home/robert/OpenVIII/FF8/Program.cs:17

我触发这个的代码：

Format = ffmpeg.avformat_alloc_context();

Binaryhelper 应该为文件正确设置路径

internal static void RegisterFFmpegBinaries()
        {
            var libraryPath = "";
            switch (Environment.OSVersion.Platform)
            {
                case PlatformID.Win32NT:
                case PlatformID.Win32S:
                case PlatformID.Win32Windows:
                    var current = Environment.CurrentDirectory;
                    var probe = Path.Combine(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:
                    libraryPath = "/usr/lib/x86_64-linux-gnu";
                    RegisterLibrariesSearchPath(libraryPath);
                    break;
                case PlatformID.MacOSX:
                    libraryPath = Environment.GetEnvironmentVariable(LD_LIBRARY_PATH);
                    RegisterLibrariesSearchPath(libraryPath);
                    break;
            }
        }

FFmpeg.Autogen.dll.config

<configuration>
  <dllmap os="linux" dll="avutil-56.dll" target="/usr/lib/x86_64-linux-gnu/libavutil.so.56"/>
  <dllmap os="linux" dll="avcodec-58.dll" target="/usr/lib/x86_64-linux-gnu/libavcodec.so.58"/>
  <dllmap os="linux" dll="avformat-58.dll" target="/usr/lib/x86_64-linux-gnu/libavformat.so.58"/>
  <dllmap os="linux" dll="avdevice-58.dll" target="/usr/lib/x86_64-linux-gnu/libavdevice.so.58"/>
  <dllmap os="linux" dll="avfilter-7.dll" target="/usr/lib/x86_64-linux-gnu/libavfilter.so.7"/>
  <dllmap os="linux" dll="avresample-4.dll" target="/usr/lib/x86_64-linux-gnu/libavresample.so.4"/>
  <dllmap os="linux" dll="swscale-5.dll" target="/usr/lib/x86_64-linux-gnu/libswscale.so.5"/>
  <dllmap os="linux" dll="swresample-3.dll" target="/usr/lib/x86_64-linux-gnu/libswresample.so.3"/>
  <dllmap os="linux" dll="postproc-55.dll" target="/usr/lib/x86_64-linux-gnu/libpostproc.so.55"/>
</configuration>

Answer 1

https://github.com/Ruslan-B/FFmpeg.AutoGen/issues/109#issuecomment-477756443

Ruslan-B 说他会修好它。

应用修复程序后，它基本上可以正常工作，我想我只是看不到视频，因为我使用的色彩空间对于 linux 是错误的，这是我的猜测。音频工作正常。

但是这个问题已经关闭了。

Elgonzo 在评论中帮助指出正确的问题不是库加载失败。那就是 FFmpeg.Autogen 使用了错误的 windows-only 函数。

在 Mono/Linux 中使用 FFmpeg.Autogen 4.1.0.2 时找不到 Kernel32

Kernel32 not found when using FFmpeg.Autogen 4.1.0.2 in Mono/Linux

c#

dll

mono

ffmpeg

autogen

https://github.com/Ruslan-B/FFmpeg.AutoGen/issues/109