24 lines
1.3 KiB
Text
24 lines
1.3 KiB
Text
The mp3encode package encodes MPEG layer I, II and III audio files.
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This is the reference implementation so don't expect spectacular performance.
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Driving encode is pretty simple although it may take some practice to
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work out an optimal compression rate. AIFF files are the only type of files that
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seem to work with this version so you may need to install a port like "sox" to
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convert your file types. I use the "nas" port to record and edit all of my audio
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files but so long as you have a valid AIFF file it shouldn't matter what you
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use.
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Although the source code includes a decoder I have decided not to port
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it because we already have a couple of top class MPEG decoders in the ports
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collection.
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Psychoacoustic model 2 is the only supported model in layer III
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encoding. A bit-rate of 128 kilobits/s is adequate for most forms of music but
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you may need to turn down the compression to 160 kilobits/s if the music is
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particularly atmospheric.
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Vocal spoken recordings are best encoded using a 32 kilobits/s bit-rate
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with layer II (layer III makes you sound like a Dalek under digital water) with
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a 32 kHz sample rate in mono. Using this method I have managed to get about 5
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minutes of AM radio quality audio into around 1 MB.
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If anyone finds any bugs in this software please let me know and include
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patches to fix them.
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Share and enjoy,
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Joel...
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