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Originally Posted by Quoth
The Hi-MD was too late. It allowed digital reading of the media and alternates to ATRAC, inc uncompressed. Sony deliberately made it impossible to digitally read even your own live recordings from mini-disc.
The MD-LP Atrac must have been 10:1 bit rate compression as it doubled play time. So standard ATRAC was 292 kbit/s, and LP 132 kbit/s. Later there were other ATRAC versions.
They also later had improved encoders producing files compatible with the earliest players.
Sony media execs just about crippled every Sony HW product.
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FFmpeg has an implementation[11] of an ATRAC3 decoder, which was converted to fixed precision and implemented in the Rockbox series of firmware for ARM, Coldfire and MIPS processors. RealAudio8 is a high-bitrate implementation of ATRAC3 (up to 352.8kbit/s). Atracdenc is an open source implementation of ATRAC3 compatible encoder which also can use RealAudio container.
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Had a Sony HDD NW-HD5, yes the Atrac software was so messy, and available only for Windows, too it didn't had a Rockbox version.