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* [fdk-aac] make patent-encumbered HE-AAC optional By default, use a fork of fdk-aac (which was originally written by Fraunhofer for the Android Open Source Project) which has support for the patent-encumbered HE-AAC, HE-AACv2, and xHE-AAC profiles removed. This fork is used by Fedora and Arch Linux to provide support for most AAC use cases without patent licensing fees and to permit combining it with GPL software. The upstream fdk-aac with support for all AAC profiles can be built with the new 'he-aac' option for this port. Fedora Legal's opinion, from https://bugzilla.redhat.com/show_bug.cgi?id=1501522#c112 : The Fedora Project is aware that the Free Software Foundation has stated that the Fraunhofer FDK AAC license is GPL incompatible, specifically, because of Clause 3. We believe that the fdk-aac software codec implementation that we wish to include in Fedora is no longer encumbered by AAC patents. This fact means that Clause 3 in the FDK AAC license is a "no op", or to put it plainly, if no patents are in play, there are no patent licenses to disclaim. For this (and only this) specific implementation of fdk-aac, we believe that the FDK AAC license is GPL compatible. Also: * remove restriction on dynamic linking. Upstream has a .def file which is used by CMake. * replace deprecated vcpkg functions * [ffmpeg] use fdk-aac[he-aac] for fdk-aac feature There is no point to this feature without HE-AAC because FFmpeg has its own AAC codec that does not support HE-AAC. |
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