Hi, Our clients asked us to add fdk_aac support into our transcoder. Our company is a licensee of Via Licensing (which collects AAC license payments) so we can use fdk_aac as we pay license fees. We distribute ffmpeg libs in accordance with LGPL and we don't want to violate anything.
According to https://trac.ffmpeg.org/wiki/Encode/AAC page: "FFmpeg can support two AAC-LC encoders (aac & libfdk_aac) and one HE-AAC(v1/2) encoder (libfdk_aac). The license of libfdk_aac is not compatible with the GPL, so the GPL does not permit distribution of binaries containing incompatible code when GPL-licensed code is also included. Therefore this encoder have been designated as "non-free", and you cannot download a pre-built ffmpeg that supports it. This can be resolved by compiling ffmpeg yourself." But on the same page in section "libfdk_aac" the following is stated: "The Fraunhofer FDK AAC codec library. This is currently the highest-quality AAC encoder available with ffmpeg. Requires ffmpeg to be configured with --enable-libfdk-aac (and additionally --enable-nonfree if you're also using --enable-gpl)." We don't plan to compile with --enable-gpl so we don't have to use --enable-nonfree but it looks like first note forbids us from distribution binary ffmpeg libs compiled with libfdk_aac in anyway. fdk_aac build script is git clone https://github.com/mstorsjo/fdk-aac.git cd fdk-aac git checkout v0.1.5 ./autogen.sh ./configure --enable-shared=no --enable-static --with-pic --prefix="$BUILD_DIR" make -j 4 make install cd .. ffmpeg configuration script will be ./configure \ --prefix="$BUILD_DIR" \ --extra-cflags="-I$BUILD_DIR/include" \ --extra-ldflags="-L$BUILD_DIR/lib" \ --bindir="$BUILD_DIR/bin" \ --enable-libfdk-aac \ --disable-static \ --enable-shared \ --enable-pic \ --disable-decoders \ --enable-decoder=aac,pcm_alaw,pcm_mulaw,mp2,h264,mpeg2video,mp3,png,mjpeg,tiff,gif,bmp,libspeex,libfdk_aac \ --disable-encoders \ --enable-encoder=aac,png,libfdk_aac \ --disable-muxers \ --disable-demuxers \ --enable-demuxer=mov,image2,gif,mp3 \ --disable-parsers \ --disable-bsfs \ --disable-protocols \ --enable-protocol=file \ --disable-indevs \ --disable-outdevs \ --enable-filters \ --disable-ffserver \ --disable-ffmpeg \ --disable-ffprobe \ --disable-ffplay \ --enable-libspeex \ --enable-libfreetype \ --disable-manpages As you can see ffmpeg could be compiled with fdk_aac but without --enable-gpl and --enable-nonfree. fdk_aac is linked to ffmpeg statically but we can link fdk_aac and ffmpeg dynamically. It doesn't matter. Static link here is just more convenient. So the question is: can we distribute ffmpeg binaries built with fdk_aac? According to "configure" params and https://www.ffmpeg.org/legal.html it's ok but according to https://trac.ffmpeg.org/wiki/Encode/AAC it's not, hence the question. Thank you.
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