https://wiki.hydrogenaudio.org/api.php?action=feedcontributions&feedformat=atom&user=93.15.217.34Hydrogenaudio Knowledgebase - User contributions [en]2026-04-28T14:18:27ZUser contributionsMediaWiki 1.44.2https://wiki.hydrogenaudio.org/index.php?title=Macintosh_Audio_Compression/Expansion&diff=26727Macintosh Audio Compression/Expansion2016-07-14T13:25:36Z<p>93.15.217.34: Add info on ffmpeg</p>
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<div>'''Macintosh Audio Compression/Expansion''' ('''MACE''') is a lossy, proprietary compression scheme developed by Apple Computer for their Macintosh line of computers.<br />
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Technically, it's very similar to how [[ADPCM]] works.<br />
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It only works on 8bit streams. It offers two compression modes: 6:1 (1/6th of the original file size, 117 kbps) and 3:1 (1/3rd of the original file size, 235 kbps). Quality is relatively poor.<br />
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ffmpeg/libavcodec is able to decode MACE3 and MACE6 streams.<br />
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Users are encouraged not to use this codec, for several reasons:<br />
* There are better alternatives quality-wise (ADPCM, WavPack lossy, psychoacoustic codecs)<br />
* Proprietary codec - E.G, on Windows platform, it can only be encoded and played in QuickTime<br />
* Won't work on bit depths other than 8bit.<br />
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== External Links ==<br />
* [http://www.quicktime.com QuickTime] plays and encodes MACE streams.<br />
* [http://cekirdek.pardus.org.tr/~ismail/ffmpeg-docs/mace_8c-source.html Reverse engineered MACE decoder sources] by Laszlo Torok, part of ffmpeg.<br />
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[[Category:Codecs]]<br />
[[Category:Lossy]]</div>93.15.217.34