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TODO: bump minor It's inferior in quality to fdk-aac and has an arguably more problematic license. As early as 2012, a HydrogenAudio user reported: > It has however one huge advantage: much better quality at low bitrates than > faac and libaacplus. (https://hydrogenaud.io/index.php?PHPSESSID=ckiq394pdglka0kj2fin6ij8t7&topic=95989.msg804633#msg804633) I myself have made a few spectrograms for a comparison of the two encoders as well. The FDK output is consistently better than the libaacplus one, in all bitrates I tested. libaacplus license is 3GPP + LGPLv2. 3GPP copyright notice is completely proprietory, as follows: > No part may be reproduced except as authorized by written permission. > > The copyright and the foregoing restriction extend to reproduction in > all media. > > © 2008, 3GPP Organizational Partners (ARIB, ATIS, CCSA, ETSI, TTA, TTC). > > All rights reserved. (The latest 26410-d00 zip from 3GPP has the same notice, but the copyright year is changed to 2015) The copyright part of the FDK AAC license (section 2) is a copyleft license that permits redistribution under certain conditions (and therefore the LGPL + libfdk-aac combination is not prohibited by configure): > Redistribution and use in source and binary forms, with or without > modification, are permitted without payment of copyright license fees > provided that you satisfy the following conditions: > > You must retain the complete text of this software license in > redistributions of the FDK AAC Codec or your modifications thereto in > source code form. > > You must retain the complete text of this software license in the > documentation and/or other materials provided with redistributions of > the FDK AAC Codec or your modifications thereto in binary form. > > You must make available free of charge copies of the complete source > code of the FDK AAC Codec and your modifications thereto to recipients > of copies in binary form. > > The name of Fraunhofer may not be used to endorse or promote products > derived from this library without prior written permission. > > You may not charge copyright license fees for anyone to use, copy or > distribute the FDK AAC Codec software or your modifications thereto. > > Your modified versions of the FDK AAC Codec must carry prominent > notices stating that you changed the software and the date of any > change. For modified versions of the FDK AAC Codec, the term > "Fraunhofer FDK AAC Codec Library for Android" must be replaced by the > term "Third-Party Modified Version of the Fraunhofer FDK AAC Codec > Library for Android."