Split stereo track MP3 files into two mono track MP3 files in a batch

1. Install FFmpeg

   • Download from: https://ffmpeg.org/download.html

   • Add ffmpeg.exe to your system PATH, or place it in the same folder as your audio files.

2. Create your batch script

   Open Notepad, paste the following:

   @echo off
   setlocal enabledelayedexpansion
   
   mkdir left
   mkdir right
   
   for %%F in (*.mp3) do (
       echo Processing %%F...
   
       ffmpeg -y -i "%%F" -filter_complex "[0:a]channelsplit=channel_layout=stereo[left][right]" ^
           -map "[left]" "%%~nF_left.mp3" -map "[right]" "%%~nF_right.mp3"
   )
   
   echo Done!
   pause

3. Save it as split_audio.bat

4. In the same folder as your .mp3 files.

5. Double-click split_audio.bat to run it
   It will split all .mp3 files into mono tracks.