Speed/rate change on MP3 using command-line

[Macarena]

Dear users,

I wish to slow down the speed of the track and convert the song. To my knowledge and according all the manuals I read, the following command should do the trick:

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vlc.exe -I dummy --rate=0.67 -vv song.mp3 --sout=#transcode{rate=0.67}:standard{access=file,dst="song 0.67.mp3"}

The "song 0.67.mp3" is written, but no change in speed is recorded. What should I do differently to get a slowed-down track, please?

It is interesting that running

Code: Select all

vlc.exe -I dummy --rate=0.67 -vv song.mp3

plays the song slower as requested. But, if I want to dump the result in a file, the change is not recorded.