AoA Audio Extractor
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Full user review
"Converts full movies to mp3. Won't isolate, save clips."
Worked as advertised to convert video into mp3.
Cannot save portions of the converted audio. Eg, if you want just the clip "Luke, I am your father" from Star Wars, you can't isolate and save just that portion. You'll have an mp3 of the whole move, but need something else to extract the clip.
Free, no malware, converts video to audio as advertised.