4_mono.bat

if not exist "D:\Projects\Python\Datasets\output_4" mkdir D:\Projects\Python\Datasets\output_4
cd "D:\Projects\Python\Datasets\output_3\"
for %%S in (*.wav) do "C:\Program Files (x86)\ffmpeg\bin\ffmpeg.exe" -i "%%S" -ac 1 "D:\Projects\Python\Datasets\output_4\%%S"
pause