AAC-LD/ELD it is either 480 or 512 PCM samples per frame and channel. http://opus-codec.org/downloads/ https://archive.mozilla.org/pub/opus/opus-1.2.1.tar.gz build for android: https://stackoverflow.com/questions/17869333/makefile-needed-for-compilin
ffmpeg version N-49044-g89afa63 Copyright (c) 2000-2013 the FFmpeg developers built on Jan 19 2013 20:36:06 with gcc 4.7.2 (GCC) configuration: --enable-gpl --enable-version3 --disable-w32threads --enable-avisynth --enable-bzlib --en libavutil 5