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22kHz mono 11KBps
"Modern World," copyright Gary Lamb

General Information
IMA is a cross-platform audio codec which offers 4:1 compression, and is built into QuickTime 2.1 and later. It only works on 16-bit audio, and provides very good sound quality.
Architectures Supported
Pros, Cons & Tips
  • 4:1 compression allows a 16-bit, 22 kHz audio soundtrack to fit into half the space of a 8-bit, 22 kHz soundtrack -- but sounds better.

  • Since IMA is only 4:1 compression, it is not great for Web video.
  • Strong low-frequency sounds, such as drumbeats, may not be accurately reproduced.


Ideal source material Most audio
Compression Ratio / Datarates 4:1 compression of 16-bit samples
Compression time -
Special features -
Encoder requirements Any MacOS or Windows
Decoder requirements Any MacOS or Windows
Encoder availability Built into QT 2.1 and later
Decoder availability Built into QT 2.1 and later
Manufacturer Apple

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