How to encode huge FLAC files into MP3 and other files like AAC?

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http://unix.stackexchange.com – My problem is very long recordings, longer than supported by WAV. I'm talking about continuous recordings of around eight hours in length. Now, I do most of my recording using sox into FLAC, which makes the most sense, since those are live recordings from an external sound card. Now, I'd like to encode that into MP3 or into AAC (in an MP4 container). The only way I managed to do that, is using FFmpeg, but I'd actually rather use encoder applications like lame, or neroaacenc. Now, I was doing that where possible, but I was uising WAV as a detour. I was decoding the FLAC into WAV and then en (HowTos)