I'm looking for a Windows command-line tool that will allow me to increase the playback speed of MP3 files (podcasts and audiobooks). Preferrably free or open source.
Update: I want to be able to listen to a 1 hour podcast in less than 60 minutes, but it would be nice if the pitch wasn't changed.
If necessary, I can convert the MP3 to WAV first and then back again.
Answer
SoX, the Swiss Army knife of sound processing programs, can do this without a hitch:
sox --show-progress input.mp3 output.mp3 tempo 1.5
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