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• 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 !

• 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 ?

• How to "mimic" -c copy when using filters with ffmpeg ? Is there a built-in feature or I'll need some scripting ? [closed]

  29 décembre 2023, par Fabio Freitas

  I'm aware that any stream ffmpeg processes is decoded before applying any desired changes and then re-encoded, which means the stream in question can't simply be copied with -c copy.

  


  Still, I'm not yet very knowledgeable on dealing with media files. Currently, the single issue I'm addressing is cropping black bars from the sides when 4:3 is encoded as 16:9.

  


  That's fairly simple, and I quickly managed to get it going.

  


  Then I noticed some weird stuff via mediainfo and the explorer's side panel. Stream sizes, bitrates and some other details were different than expected.

  


  ---

  


  That's where -c copy comes in. Over the years, every time I tried to solve this, answers would stop at "-c copy can't be used if the stream will be decoded", which is good enough to stop noobs like me from wasting time.

  


  But since I don't know how to use advanced encoding settings, the -c copy I'm looking for is actually how can I re-encode my processed stream using the same (or most similar) settings used before I decoded it.

  


  Is there such an option in ffmpeg ? Are these settings I'm looking for even obtainable by any means ? And if "no" and "yes", could I use ffprobe to write a script for ffmpeg ?

  


  BTW, I'm on Windows 11, but I have Git's SCM tools available.