![]() Overview - Is it a file, a container or a codec.Not only is it free, it's also very good. ![]() Quality is comparable to HE-AAC/Orbis at the top end and very close to the best proprietary narrowband codecs at the bottom end. Opus offers a wide range of bit rates (6Kbit/s to 510Kbit/s), frame sizes (2.5ms to 120ms) and sampling rates (8 kHz to 48KHz) making it suitable for interactive (VoIP), streaming and audio playback. While we have had royalty-free codes for some time (notably, speex and ogg vorbis) this is the first time we have seen one with the imprimatur of the IETF. September, 2012 marked the publication of RFC 6716 which defined a new royalty-free codec which goes by the name of Opus, and represents, essentially, the merger of work done by Skype and (developers of ogg, speex and other codecs). We can never find stuff in one place - here is a collection of audio/video file formats together with some basic notes and links to additional information. Tech Stuff - Audio/Video Files, Codecs and Containers
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