FFMPEG - Batch convert subfolders

I am trying to set up a Windows batch file to convert a number of MP4 files using FFMPEG. There are a number of files in multiple subfolders, therefore I need the script to execute on each file in each subfolder. I'm afraid I don't have much experience of using batch files but from my research I've got the following command text: ``` FOR %%i in (*.mp4) /R DO (ffmpeg32 -i "%%~ni.mp4" -map 0:0 -map 0:1 -map 0:1 -c:v copy -c:a:0 aac -b:a 128k -ac 2 -strict -2 -cutoff 15000 -c:a:1 copy "%~ni&(2).mp4") ``` The script basically needs to add an AAC audio stream to an existing MP4 file, therefore I need to change the output name by adding a (2) at the end of the filename. I've tested the ffmpeg command separately so happy that it works - I just need to get the correct batch commands. Thanks in advance for any pointers! Cheers