FLV2MP3 and 10 Best Alternative Sites to Convert YouTube to MP3 [Free]
Remove Flv2mp3 (virus) - Free Guide
flv2mp3.org is now known as flv2mp3.by and it's back to mp3 conversions
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GitHub - appelblim/Flv2Mp3: A frontend for ffmpeg written in GTK+-3.0 / C capable of transcribing video files into mp3's of variable quality and setting metadata - this is very basic, it leaks