A Very Low-Bitrate Codec for Speech Compression
https://github.com/google/lyra/
Use FFmpeg to convert audio to wav format supported by lyra.
ffmpeg -i test.flac -ac 1 -ar 48000 test.wav
Then place it in the /storage/emulated/0/Android/data/me.ag2s.lyraandroidtest/cache/test.wav
Click "Encode" and "Decode" to encode and decode.You can choose Bitrate on the right.
All encoded and decoded files are in /storage/emulated/0/Android/data/me.ag2s.lyraandroidtest/cache/.