Hi my name is George and I have a problem with Audacity who does not want to open the mp4 files, I installed Audacity after I installed the FFmpeg library and the MP3 library was already installed, for video details open the link below :
When the pop-up appears that says “Select stream(s) to import”, you need to select the streams that you want to import. You didn’t select any.
Thanks, works now. 