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DoogiesWiki [blog:recording_a_radio_stream_on_mac]

Recording a Radio Stream on Mac

There are hundreds of internet radio stations out there. And many of them play radio music as it should be: one station one genre, and no advertising! But how to record them?

Here I describe my toolchain on my mac that only uses free tools.

The actual recording is done in Audacity. Audacity also has the possibility to edit the recording afterwards. The most import thing to watch for is the line in level. The loudest beat should not have a peak higher than the border of the track. This is called normalisation. You can adjust the recording volume with the slider on next to the microphone.

Audacity Screenshot

But the problem is: How to get the playing audio from iTunes into Audacity? On a Mac in the Audacity preferences, the only available input sources are the build-in microphone or the line-in. We need one more tool for that:

"Soundflower is a Mac OS X (10.2 and later) system extension that allows applications to pass audio to other applications." Thats exactly what we need. Soundflower appears as an additional audio device in the system preferences. Since iTunes does not allow to select an output device, we have to set this in the global OS X system preferences. Select "Soundflower (2ch)" as default output device. And then in the Audacity preferences select this device as input for recording.

Click play in iTunes and click the record button in Audacity and you are all set. Afterwards you can export the recorded audio as an MP3 file.

Be carefull that no other application (e.g. ICQ) makes any sound while you are recording, because those other sounds would also be audible on the track.

 
blog/recording_a_radio_stream_on_mac.txt · Zuletzt geändert: 30.06.2009 09:32 von doogie
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