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• FFmpeg 32-bit DLLs fail to load on Windows when switching target platform to 32-bit in C# project (Linux cross-compile with MinGW)

  8 novembre 2024, par ryan

  I’m working on a C# project in Windows that integrates FFmpeg DLLs. I need both 32-bit and 64-bit FFmpeg DLLs. The 64-bit DLLs load and work fine, but when I change the target platform in my project settings to 32-bit, some 32-bit DLLs (specifically avfilter-7.dll) fail to load, even though they’re in the correct directory.

  


  Code :

  


  case PlatformID.Win32Windows:
    return WindowsNativeMethods.LoadLibrary(libraryName);


  


  is returning a null pointer for avfilter-7.dll.

  


  Error Received :

  


  System.Runtime.InteropServices.Marshal.GetLastWin32Error() = 0x0000007e 


  


  Which I think translates to ERROR_MOD_NOT_FOUND.

  


  Environment & Context :

  


  

  • Linux VM : Using a Linux virtual machine to cross-compile FFmpeg for Windows.

  


  • Tool : ffmpeg-windows-build-helpers script from https://github.com/rdp/ffmpeg-windows-build-helpers.

  


  • Cross-Compiler : MinGW (latest version installed on VM).

  


  • Target Architectures : Both 32-bit and 64-bit DLLs for Windows.

  


  • FFmpeg Version : n4.4.5 (using —ffmpeg-git-checkout-version=n4.4.5).

  


  


  Compilation Command :
Using the helper script, I’ve tried the following command to generate the 32 and 64 bit shared libraries :

  


  ./cross_compile_ffmpeg.sh --ffmpeg-git-checkout-version=n4.4.5 --disable-nonfree=y --build-libmxf=n --build-mp4box=n --build-vlc=n --build-svt-hevc=n --build-svt-vp9=n --build-dvbtee=n --build-dependencies=y --build-mplayer=n --build-ffmpeg-static=n --build-ffmpeg-shared=y --prefer-stable=y --build-x264-with-libav=n


  


  I’ve also updated MinGW to the latest version on the VM to ensure compatibility.

  


  Questions :

  


  

  1. What might be causing the 32-bit FFmpeg DLLs (like avfilter-7.dll) to fail to load on a Windows platform, while 64-bit DLLs work fine ?

  


  2. Are there specific flags or steps in the build process needed to ensure compatibility for 32-bit FFmpeg DLLs in a 64-bit Windows environment ?

  


  3. Are there common pitfalls when cross-compiling 32-bit and 64-bit FFmpeg DLLs with MinGW on Linux that could cause these loading issues ?

  


  


  Any insights or additional troubleshooting tips would be greatly appreciated !

  


• Cannot read xvid video with opencv in python on mac

  15 février 2017, par crazjo

  I have been trying for hours to read a xvid .avi file on my mac with python 2.7 and opencv. I have installed all the latest versions using brew and opencv is working in python and I can open images and other movie files but when I try to read a xvid avi file with

  cap.cv2.VideoCapture('video.AVI')
  
  ret, frame = cap.read()

  It fails as frame is empty. I have installed ffmpeg with brew and x264 as well and ran brew doctor. I am totally lost what to do now. Happy to provide more information if needed. I hope someone can help me, thanks.

• Converting mp3 and jpg to mp4 with h.264 and aac

  18 octobre 2020, par mead650

  I have over 500 sermons in audio format (.mp3). I want to use FFMPEG because its free and I like the software.

  


  I am trying to combine the .mp3s with a jpg (picture of my church) to create .mp4 for Youtube.

  


  I know that YouTube usually does well with Audio format:aac or mp3 and Video format:AVC with h.264.

  


  here is the code :

  


  FOR %%a IN (audio/*.mp3) DO (
echo Converting: %%a
ffmpeg -i image/img.jpg -i "%%a" -c:v copy -c:a -vcodec libx264 -acodec aac -strict -2 videos/%%~na.mp4
)
echo Finished


  


  I have the FFMPEG with a do loop, but I am getting this error, [NULL @ 000002574bea6b40] Unable to find a suitable output format for 'libx264'
libx264 : Invalid argument

  


  I have the latest version.
Anytakers ?