Which OS are you using - if Windows, then a simple recursive batch file will run it for all the subfolders. Just copy and paste the contents in Bold below into a new notepadĀ file and save with a .bat extension (ie add-ac3.bat) and then from a command line, run this batch file from the root location of where you want to convert all the files (including all subfolders). ie - if all your movies are under c:\movies - then put it in this folder and run it from there and it will also do all