YouTube audio is usually aac. Sometimes I have saved audio as an .aac file without re-encoding. (Not using the same scripts, what I have done typically is get t

YouTube audio is usually aac. Sometimes I have saved audio as an .aac file without re-encoding. (Not using the same scripts, what I have done typically is get the mp4 and do: ffmpeg -i foo.mp4 -acodec copy foo.aac) Any audio player worth its salt should play .aac files. I think for the most common types [low-complexity] the patents are expired. (Curious if somebody has one that doesn't.)