Wolfram Language & System 10.3 (2015)|Legacy Documentation

This is documentation for an earlier version of the Wolfram Language.View current documentation (Version 11.2)

MP3 (.mp3)


    MIME types: audio/mpeg, audio/mpeg3, audio/x-mpeg-3MP3 digital audio format, known as MPEG Audio Layer 3.
    A lossy compression scheme commonly used for consumer audio streaming, storage, transfer, and playback, which can also be used on the web.
    Binary file format.
    Follows the ISO/IEC 11172-3 and ISO/IEC 13818-3 standard.
    Supports a few sampling frequencies from 8kHz to 48kHz.
    Supports up to two audio channels.

Import and ExportImport and Export

  • Import["file.mp3"] imports an MP3 file, returning a sound object.
  • Import["file.mp3"] converts the compressed data to pulse-code modulation (PCM) and gives an expression of the form Sound[SampledSoundList[data,r]].
  • Export["file.mp3",expr] creates an MP3 file from the sound object expr.
  • Import["file.mp3",elem] imports the specified element from an MP3 file.
  • Import["file.mp3",{{elem1,elem2,}}] imports multiple elements.
  • The import format can be specified with Import["file","MP3"] or Import["file",{"MP3",elem,}].
  • Export["file.mp3",expr,elem] creates an MP3 file by treating expr as specifying element elem.
  • Export["file.mp3",{expr1,expr2,},{{elem1,elem2,}}] treats each as specifying the corresponding .
  • Export["file.mp3",expr,opt1->val1,] exports expr with the specified option elements taken to have the specified values.
  • Export["file.mp3",{elem1->expr1,elem2->expr2,},"Rules"] uses rules to specify the elements to be exported.
  • See the reference pages for full general information on Import and Export.
  • ImportString and ExportString support the MP3 format.


  • General Import elements:
  • "Elements"list of elements and options available in this file
    "Rules"full list of rules for each element and option
    "Options"list of rules for options, properties, and settings
  • Data representation elements:
  • "Data"raw audio samples, given as a list of real numbers, each sublist representing an individual audio channel
    "SampledSoundList"sound data given as a SampledSoundList object
    "Sound"sound data given as a Sound object
  • The element corresponds to the first argument of SampledSoundList.
  • Multiple channels are represented as an array of audio samples.
  • Import and Export use the element by default for MP3 files.
  • Advanced Import element:
  • "AudioChannels"the number of audio channels in the file
    "SampleRate"number of amplitude samples per second and channel


  • General option:
  • SampleRateAutomaticnumber of amplitude samples per second for each channel
  • Export options:
  • "AudioChannels"Automaticnumber of audio channels
    "CompressionLevel"0.5compression level, given as a number between 0 and 1
  • Supported Export sample rates in Hz are 8000, 11025, 16000, 22050, 24000, 32000, 44100, and 48000.

ExamplesExamplesopen allclose all

Basic Examples  (2)Basic Examples  (2)

Import an MP3 file:

Click for copyable input

Generate a sound and export to MP3:

Click for copyable input
Click for copyable input
Introduced in 2014