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| author | Timothy Gu <timothygu99@gmail.com> | 2016-01-24 09:49:12 -0800 |
|---|---|---|
| committer | Timothy Gu <timothygu99@gmail.com> | 2016-01-29 17:14:37 -0800 |
| commit | 9ba54c1b82a81581e5283da75c153a76f04324c0 (patch) | |
| tree | 75d0adad5a7f644ca3e3138032ea09586ad5121c /LICENSE.md | |
| parent | 5893e8753702765ec4c2f775d7beef6afe7265e7 (diff) | |
| download | ffmpeg-9ba54c1b82a81581e5283da75c153a76f04324c0.tar.gz | |
avcodec: Remove libaacplus
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."
Diffstat (limited to 'LICENSE.md')
| -rw-r--r-- | LICENSE.md | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/LICENSE.md b/LICENSE.md index 4c4a84534a..0c53d0f5a9 100644 --- a/LICENSE.md +++ b/LICENSE.md @@ -104,7 +104,7 @@ license version needs to be upgraded by passing `--enable-version3` to configure incompatible libraries ---------------------- -The Fraunhofer AAC library, FAAC and aacplus are under licenses which +The Fraunhofer AAC library and FAAC are under licenses which are incompatible with the GPLv2 and v3. We do not know for certain if their licenses are compatible with the LGPL. If you wish to enable these libraries, pass `--enable-nonfree` to configure. |