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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 !

  


• How to batch process with ffmpeg script, but do each step in a loop instead of two stages

  14 mai 2024, par Matt

  I'm a novice script editor. I convert MOV/AVI video files to MP4 format using a script with ffmpeg and then move the files after processing :

  


  for f in *.mov; do ffmpeg -y -i "$f" "${f%}.mp4"; done

mv -f *.mov /Users/me/Videos/mov
mv -f *.MOV /Users/me/Videos/mov
mv -f *.avi /Users/me/Videos/avi
mv -f *.AVI /Users/me/Videos/avi


  


  


  1. Currently the script converts all videos, then moves them all to the other folders. Please how can the script be adjusted so that each video is moved immediately after processing (instead of waiting until all are complete) ? This would be a great improvement, as sometimes there are a lot of videos and the script gets interrupted for some reason (not a fault of the script). It will make it easier to monitor progress.

     


  


  2. Currently I manually tweak the first line changing *.mov for *.avi Please is there an easy way to handle either video file format/extension, within the same line ?

     


  


  3. Is there a better way of handling the mv statements which have multiple lines for lower/uppercase ? They also give error if there are no files of that type.

     


  


  


  Thank you

  


  The above script is functional but will be better with enhancements or changes.

  


• SNAP : Simulation and Neuroscience Application Platform [closed]

  19 avril 2024, par S_S

  Is there any documentation/help manual on how to use SNAP (Simulation and Neuroscience Application Platform)1.

  



  I wanted to run the Motor Imagery sample scenario with a .avi file for the stimulus instead of the image. How can that be done ?

  



  The following error is obtained when using the AlphaCalibration scenario which gives code to play an avi file.Any help appreciated

  



  :movies:ffmpeg(warning): parser not found for codec indeo4, packets or times may be invalid.
:movies:ffmpeg(warning): max_analyze_duration 5000000 reached at 5000000
:movies(error): Could not open /e/BCI_Feb2014/SNAP-master/src/studies/SampleStudy/bird.avi
:audio(error): Cannot open file: /e/BCI_Feb2014/SNAP-master/src/studies/SampleStudy/bird.avi
:audio(error): Could not open audio /e/BCI_Feb2014/SNAP-master/src/studies/SampleStudy/bird.avi
:movies:ffmpeg(warning): parser not found for codec indeo4, packets or times may be invalid.
:movies:ffmpeg(warning): max_analyze_duration 5000000 reached at 5000000
:movies(error): Could not open /e/BCI_Feb2014/SNAP-master/src/studies/SampleStudy/bird.avi
:gobj(error): Texture "/e/BCI_Feb2014/SNAP-master/src/studies/SampleStudy/bird.avi" exists but cannot be read.
Traceback (most recent call last):
  File "E:\BCI_Feb2014\SNAP-master\src\framework\latentmodule.py", line 458, in _run_wrap
    self.run()
  File "modules\BCI\AlphaCalibration.py", line 30, in run
Exception during run():
    m = self.movie(self.moviefile, block=False, scale=[0.7,0.4],aspect=1.125,contentoffset=[0,0],volume=0.3,timeoffset=self.begintime+t*self.awake_duration,looping=True)
Could not load texture: bird.avi
  File "E:\BCI_Feb2014\SNAP-master\src\framework\basicstimuli.py", line 348, in movie
    tex = self._engine.base.loader.loadTexture(filename)
  File "E:\BCI_Feb2014\Panda3D-1.8.0\direct\showbase\Loader.py", line 554, in loadTexture
    raise IOError, message
IOError: Could not load texture: bird.avi