ffmpeg -ss 0.125 -i "input.mp3" -acodec copy "output.mp3"

find -E "path/to/audio/files" -type f -iregex ".*.(MP3)$" |
  while read full_audio_filepath
  do

     # Break up the full audio filepath stuff into different directory and filename components.
     audio_dirname=$(dirname "${full_audio_filepath}");
     audio_basename=$(basename "${full_audio_filepath}");
     audio_filename="${audio_basename%.*}";

     # Set the MP3 directory.
     mp3_dirpath="${audio_dirname}/mp3";
     mp3_filepath="${mp3_dirpath}/${audio_filename}.mp3";

     # Create the child MP3 directory.
     mkdir -p "${mp3_dirpath}";

     # And here is where the magic happens.
    ffmpeg -y -v quiet -ss 0.125 -i "$full_audio_filepath" -acodec copy "$mp3_filepath" < /dev/null;

  done