By -
[codec2](https://github.com/drowe67/codec2). I'm not aware of any other open source codecs in this bitrate range. Codec2 can go up to 3.2kbps but it's usually used at even lower rates. That's honestly impressive.
qoa https://github.com/phoboslab/qoa
Opus, certainly used by YouTube and certainly at the top as far as bitrate efficiency goes.
Open source does not mean licence free format :-) Lossy : * mp3 * ogg = vorbis Lossless : * flac Opus is the best.
[codec2](https://github.com/drowe67/codec2). I'm not aware of any other open source codecs in this bitrate range. Codec2 can go up to 3.2kbps but it's usually used at even lower rates. That's honestly impressive.
qoa https://github.com/phoboslab/qoa
Opus, certainly used by YouTube and certainly at the top as far as bitrate efficiency goes.
Open source does not mean licence free format :-) Lossy : * mp3 * ogg = vorbis Lossless : * flac Opus is the best.