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• Urgent Help Needed : FFmpeg Integration in .NET MAUI for Android [closed]

  15 juin 2024, par Billy Vanegas

  I'm currently facing a significant challenge with integrating FFmpeg into my .NET MAUI project for Android. While everything works smoothly on Windows with Visual Studio 2022, I'm having a hard time replicating this on the Android platform. Despite exploring various NuGet packages like FFMpegCore, which appear to be wrappers around FFmpeg but don't include FFmpeg itself, I'm still at a loss.

  


  I've tried following the instructions for integrating ffmpeg-kit for Android, but I keep running into issues, resulting in repeated failures and growing confusion. It feels like there is no straightforward way to seamlessly incorporate FFmpeg into a .NET MAUI project that works consistently across both iOS and Android.

  


  The Problem :

  


  I need to convert MP3 files to WAV format using FFmpeg on the Android platform within a .NET MAUI project. I’m using the FFMpegCore library and have downloaded the FFmpeg binaries from the official FFmpeg website.

  


  However, when attempting to use these binaries on an Android emulator, I encounter a permission denied error in the working directory : /data/user/0/com.companyname.projectname/files/ffmpeg

  


  Here’s the code snippet where the issue occurs :

  


  await FFMpegArguments
      .FromFileInput(mp3Path)
      .OutputToFile(wavPath, true, options => options
          .WithAudioCodec("pcm_s16le")
          .WithAudioSamplingRate(44100)
          .WithAudioBitrate(320000)
          )
      .ProcessAsynchronously();
    


  


  Additional Details :

  


  I've updated AndroidManifest.xml with permissions, but the issue persists.

  


  I've created a method ConvertMp3ToWav to handle the conversion.
I also have a method ExtractFFmpegBinaries to manage FFmpeg binaries extraction, but it seems the permission issue might be tied to how these binaries are accessed or executed.

  


  AndroidManifest.xml :

  


  &lt;?xml version="1.0" encoding="utf-8"?>&#xA;<manifest>&#xA;    <application></application>&#xA;    &#xA;    &#xA;    &#xA;    &#xA;</manifest>&#xA;

  


  Method ConvertMp3ToWav :

  


  private async Task ConvertMp3ToWav(string mp3Path, string wavPath)
{
    try
    {
        // Check directory and create if not exists
        var directory = Path.GetDirectoryName(wavPath);
        if (!Directory.Exists(directory))
            Directory.CreateDirectory(directory!);

        // Check if WAV file exists
        if (!File.Exists(wavPath))
            Console.WriteLine($"File not found {wavPath}, creating empty file.");
            using var fs = new FileStream(wavPath, FileMode.CreateNew);

        // Check if MP3 file exists
        if (!File.Exists(mp3Path))
            Console.WriteLine($"File not found {mp3Path}");

        // Extract FFmpeg binaries
        string? ffmpegBinaryPath = await ExtractFFmpegBinaries(Platform.AppContext);

        // Configure FFmpeg options
        FFMpegCore.GlobalFFOptions.Configure(new FFOptions { BinaryFolder = Path.GetDirectoryName(ffmpegBinaryPath!)! });

        // Convert MP3 to WAV
        await FFMpegArguments
              .FromFileInput(mp3Path)
              .OutputToFile(wavPath, true, options => options
                  .WithAudioCodec("pcm_s16le")
                  .WithAudioSamplingRate(44100)
                  .WithAudioBitrate(320000)
                  )
              .ProcessAsynchronously();
    }
    catch (Exception ex)
    {
        Console.WriteLine($"An error occurred during the conversion process: {ex.Message}");
        throw;
    }
}


  


  Method ExtractFFmpegBinaries :

  


  private async Task<string> ExtractFFmpegBinaries(Context context)&#xA;{&#xA;    var architectureFolder = "x86"; // Adjust according to device architecture&#xA;    var ffmpegBinaryName = "ffmpeg"; &#xA;    var ffmpegBinaryPath = Path.Combine(context.FilesDir!.AbsolutePath, ffmpegBinaryName);&#xA;    var tempFFMpegFileName = Path.Combine(FileSystem.AppDataDirectory, ffmpegBinaryName);&#xA;&#xA;    if (!File.Exists(ffmpegBinaryPath))&#xA;    {&#xA;        try&#xA;        {&#xA;            var assetPath = $"Libs/{architectureFolder}/{ffmpegBinaryName}";&#xA;            using var assetStream = context.Assets!.Open(assetPath);&#xA;           &#xA;            await using var tempFFMpegFile = File.OpenWrite(tempFFMpegFileName);&#xA;            await assetStream.CopyToAsync(tempFFMpegFile);&#xA;&#xA;            // Adjust permissions for FFmpeg binary&#xA;            Java.Lang.Runtime.GetRuntime()!.Exec($"chmod 755 {tempFFMpegFileName}");&#xA;        }&#xA;        catch (Exception ex)&#xA;        {&#xA;            Console.WriteLine($"An error occurred while extracting FFmpeg binaries: {ex.Message}");&#xA;            throw;&#xA;        }&#xA;    }&#xA;    else&#xA;    {&#xA;        Console.WriteLine($"FFmpeg binaries already extracted to: {ffmpegBinaryPath}");&#xA;    }&#xA;&#xA;    return tempFFMpegFileName!;&#xA;}&#xA;</string>

  


  What I Need :

  


  I urgently need guidance on how to correctly integrate and use FFmpeg in my .NET MAUI project for Android. Specifically :

  


  How to properly set up and configure FFmpeg binaries for use on Android within a .NET MAUI project.
How to resolve the permission denied issue when attempting to execute FFmpeg binaries.

  


  Any advice, solutions, or workarounds would be greatly appreciated as this is a critical part of my project and I'm running out of time to resolve it.

  


  Thank you in advance for your help !

  


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• Problems with ffmpeg cross-compilation for windows x64 using linux/mingw

  3 mai 2023, par Adam

  I'm cross-compiling ffmpeg with NVIDIA hw acceleration for windows 64 with ubuntu/mingw.
The configuration/make process is OK but dumpbin shows that avfilter-9.dll file tries to import some kernel functions twice - from kernel32 which is correct and second time from... npp dlls !

  


  dumpbin /imports avfilter-9.dll
:
    nppig64_12.dll
             180587CC8 Import Address Table
             180587148 Import Name Table
                     0 time date stamp
                     0 Index of first forwarder reference

                         154 nppiRotate_8u_C1R
                         100 nppiResizeSqrPixel_8u_C1R
                           1 AcquireSRWLockExclusive
                         11B DeleteCriticalSection
                         13F EnterCriticalSection
                         228 GetCurrentProcess
                         229 GetCurrentProcessId
                         22D GetCurrentThreadId
                         276 GetLastError
:
   KERNEL32.dll
             180587CD8 Import Address Table
             180587158 Import Name Table
                     0 time date stamp
                     0 Index of first forwarder reference

                           1 AcquireSRWLockExclusive
                         11B DeleteCriticalSection
                         13F EnterCriticalSection
                         228 GetCurrentProcess
                         229 GetCurrentProcessId
                         22D GetCurrentThreadId
                         276 GetLastError
                         301 GetSystemTimeAsFileTime
                         31F GetTickCount
                         375 InitOnceBeginInitialize


  


  My ./configure :

  


  sudo PKG_CONFIG_PATH=/usr/local/lib/pkgconfig/ ./configure --arch=x86_64 --target-os=mingw64 --cross-prefix=x86_64-w64-mingw32- --enable-nonfree --enable-cuda-nvcc --enable-nvenc --enable-libnpp --extra-cflags=-I/usr/local/cuda/include --extra-ldflags=-L/usr/local/cuda/lib64 --extra-cflags=-I../npp_dev/include/ --extra-ldflags=-L../npp_dev/lib/x64/ --disable-static --enable-shared


  


  /npp_dev contains include/lib files for npp (windows 64).

  


  Anybody encountered similar issue or has any idea what I should start looking at ?

  


  Important note - without —enable-libnpp the avfilter-9.dll is correctly generated.

  


  Thanks ! //Adam