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I've tried ffmpeg but there is no /dev/dsp device.

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up vote 6 down vote accepted

Try SoX or Ecasound.

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Those could work but I'd really like to have a ffmpeg solution because I alredy use it for other things. – codeflakes Sep 14 '11 at 16:33
Apparently ffmpeg supports Mac audio recording out of the box if built with OpenAL. So go right ahead. – Ingmar Hupp Sep 14 '11 at 18:14

I'd recommend looking into MPlayer OSX Extended -- it's a port of the linux app "mplayer" and will let you record from a multitude of audio sources (including streams and remote files).

/Applications/MPlayer\ OSX\ \ \
    -cache 1024 -ao coreaudio:device_id=49 -volume 65 -ac hwac3, -slave \
    -identify -noar -dumpstream -dumpfile ~/Desktop/stream.mp3

See for more information

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