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• FFmpeg compile opus error

  10 août 2015, par David Norgren

  I’m following this tutorial to build FFmpeg statically (to not need DLLs) using Microsoft’s compilers : http://cristobaldobranco.github.io/blog/2015/01/20/compiling-ffmpeg-with-windows-tools/

  I’m however running into trouble when attempting to compile this :

  #pragma comment (lib, "libavformat.a")
  
  #define __STDC_CONSTANT_MACROS
  
  
  
  extern "C" {
  
      #include <libavformat></libavformat>avformat.h>
  
  }
  
  
  
  int main() {
  
      av_register_all();
  
      return 0;
  
  }

  It seems to be able to find the header and library files, but I’m getting weird errors about opus :

  

  Here are my MSYS commands :

  cd C:/Libs/ffmpeg
  
  ./configure --toolchain=msvc --arch=x86 --prefix=build/ --disable-network
  
  make
  
  make install

  How do I get rid of these errors ?

• batch FFMPEG-Normalize AND convert via Python ?

  9 novembre 2017, par Boris

  I am currently working on a script to help me batch convert and
  normalize audio files (wma to mp3)
  In the search of useful tools I was lucky to stumble on FFMPEG-Normalize !

  My script is running from Python and I am calling FFMPEG via subprocess.
  I could not get the FFMPEG-Normalize to output Mp3 files - thus I am
  doing another FFMPEG call to convert the resulted wav files.
  Do you know how to make FFMPEG normalize also convert to mp3 ?
  The second issue is that only part of the files in my folder are being
  processed, I cant understand why. Out of 8 files I have in the path,
  sometimes all of them are processed and sometimes only 3, or 5... very
  weird !
  Here is my code :

  for file in sorted(os.listdir(pathdes)):
  
      os.chdir(pathdes)
  
      subprocess.call(['ffmpeg-normalize','-m','-l','-0.1',file])
  
      file = 'normalized-' + file
  
      file = file[:-3] + "wav"
  
      file2 = file[:-3] + "mp3"
  
      os.chdir(pathdes)
  
      subprocess.call(['ffmpeg', '-i', file,'-b:a','320k', file2])

  I understand FFMPEG normalize was written in Python, maybe there is
  another way to call it other than subprocess ?
  Am I missing something ? (i know i am !)

  Thank you so much !

• configure : Properly check for availability of -Wno-foo warning flags

  31 octobre 2013, par Diego Biurrun

  configure : Properly check for availability of -Wno-foo warning flags
  For some weird reason gcc does not check if the -Wno disabling variants
  
  of warning flags match existing warning flags. Instead it swallows them
  
  silently. That is, unless other warning or error messages are generated,
  
  because then - for some even more bizarre reason - a complaint about the
  
  unknown disable warning flag is issued along with the error or warning
  
  message.
  Thus to check for the availability of a warning disabling option, one
  
  needs to check for the enabling variant instead and then add the
  
  disabling variant to CFLAGS.
  

  • [DBH] configure