Codec 2 is an [[LGPL]] licensed audio codec for speech written in [[3. Reference/Software/Programming Languages/C|C]]. - [Website](https://www.rowetel.com/?page_id=452) - [Source](https://github.com/drowe67/codec2) - Documentation - [Wikipedia](https://en.wikipedia.org/wiki/Codec_2) > QUOTE # Notability Low bitrate speech codec, intended primarily for HF and VHF radio broadcast below 5000 b/s. [[Speex]] is better for higher bit rates. # Philosophy > Voice is not like data over channels and ... you should not treat it that way. # OS Support # Features # Tips Author says it isn't so good for VOIP, even using UDP because the overhead is just not worth it, due to the packet vs sample ratio producing 8000 b/s overhead for only 1400 b/s speech. # References ```cardlink url: https://youtu.be/e98MIYBYpd4 title: "Codec 2 at very low bit rates" description: "David Rowe" host: youtu.be favicon: https://www.youtube.com/s/desktop/f4449159/img/favicon_32x32.png image: https://i.ytimg.com/vi/e98MIYBYpd4/hqdefault.jpg ``` ```cardlink url: https://youtu.be/KsywWf8dQgU title: "Codec 2 - Open Source Speech Coding at 2400 bit/s and Below - David Rowe" description: "Codec2 is an open source low bit rate speech codec designed for communications quality speech at around 2400 bit/s. Applications include low bandwidth HF/VHF..." host: youtu.be favicon: https://www.youtube.com/s/desktop/f4449159/img/favicon_32x32.png image: https://i.ytimg.com/vi/KsywWf8dQgU/hqdefault.jpg ``` ```cardlink url: https://blog.simwood.com/2017/02/opus/ title: "New stack part 1 – Opus: the killer codec | Simwood" host: blog.simwood.com favicon: https://blog.simwood.com/wp-content/uploads/2019/03/cropped-favicon512-1-32x32.png image: https://blog.simwood.com/wp-content/themes/leaf/images/simwood/social1200.png ```