As always, experiment to see what works for your ears. If you are only going to play it on your computer, or you are sure that your hardware player supports HE-AAC, you can aim for a bit rate of 160kb/s for version 1, or 128kb/s for version 2. Unfortunately, many devices that can play AAC-LC (the default profile for libfdk_aac) simply cannot play either version of HE-AAC, so this is not recommended for surround sound audio, which normally needs to be compatible with such hardware players. If you have mono, or want to down-mix to mono, use HE-AAC version 1. Note: HE-AAC version 2 only handles stereo. HE-AAC version 1 is suited for bit rates below 64kb/s (for stereo audio) down to about 48 kb/s, while HE-AAC version 2 is suited for bit rates as low as 32 kb/s (again, for stereo). This is a pair of AAC profiles tailored for low bit rates (version 1 and version 2). Video:0kB audio:2759kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 2.183906% Handler_name : ISO Media file produced by Google Inc. Just don't redistribute it.Īnd then it can be done: □ ffmpeg -i in.m4a -c:a libfdk_aac -profile:a aac_he_v2 -b:a 32k out.m4aįfmpeg version N-106448-gc2d1597a8a-Nico-20220328 Copyright (c) 2000-2022 the FFmpeg developersīuilt with gcc 9 (Ubuntu 9.4.0-1ubuntu1~20.04.1)Ĭonfiguration: -prefix=/home/nico/ffmpeg_build -pkg-config-flags=-static -extra-cflags=-I/home/nico/ffmpeg_build/include -extra-ldflags=-L/home/nico/ffmpeg_build/lib -extra-libs='-lpthread -lm' -bindir=/home/nico/bin -extra-version=Nico-20220328 -enable-gpl -enable-libdav1d -enable-libass -enable-libfdk-aac -enable-libfreetype -enable-libmp3lame -enable-libopus -enable-libvorbis -enable-libvpx -enable-libx264 -enable-libx265 -enable-openssl -enable-demuxer=dash -enable-libxml2 -enable-nonfree But it's perfectly legal to compile ffmpeg yourself with libfdk-aac support, like I do.
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