Opus

Opus (codec)

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Opus
Internet media type	`audio/opus^[1]`
Developed by	Jean-Marc Valin, Koen Vos
Type of format	Audio
Contained by	Ogg, Matroska
Extended from	SILK, CELT
Standard(s)	No, Internet Draft
Open format?	Yes
Website	opus-codec.org

Opus (originally Harmony^[2]) is a low-delay wideband codec intended for applications such as VoIP that will eventually be royalty-free.^[3] Opus incorporates technology from the speech-oriented SILK codec and the low-latency CELT codec. Development for the codec is coordinated by the IETF under the ietfcodec working group.

Opus has been shown to have excellent quality,^[4] and at higher bit rates, it turns out to be competitive with codecs with much higher delay, such as HE-AAC and Vorbis.^[5]

References

^ Network Working Group (July 4, 2011). "RTP Payload Format and File Storage Format for Opus Speech and Audio Codec". Opus codec. IETF. http://datatracker.ietf.org/doc/draft-spittka-payload-rtp-opus/. Retrieved October 26, 2011.
^ Vos, Koen (2010-10-15). "Harmony became Opus". ietfcodec Discussion Archive mailing list. http://www.ietf.org/mail-archive/web/codec/current/msg01852.html. Retrieved 2011-06-19.
^ Vos, Koen (July 23, 2011). "Skype Limited's Statement about IPR related to draft-ietf-codec-opus-07". IETF. http://datatracker.ietf.org/ipr/1602/. Retrieved October 26, 2011.
^ Raymond Chen et al. Opus Testing. IETF 80
^ Maxwell, Greg (2011). "64kbit/sec stereo multiformat listening test - unofficial results page". Xiph.org Foundation. http://people.xiph.org/~greg/opus/ha2011/. Retrieved 2011-06-19.

External links

Multimedia compression and container formats

Video

ISO/IEC	MJPEG Motion JPEG 2000 MPEG-1 MPEG-2 Part 2 MPEG-4 Part 2/ASP Part 10/AVC HEVC

ITU-T	H.120 H.261 H.262 H.263 H.264 HEVC

Others	AVS Bink CineForm Cinepak Dirac DV Indeo Microsoft Video 1 OMS Video Pixlet Prores RealVideo RTVideo SheerVideo Smacker Sorenson Video, Spark Theora VC-1 VC-2 VC-3 VP3 VP6 VP7 VP8 WMV

Audio

ISO/IEC	MPEG-1 Layer III (MP3) MPEG-1 Layer II Multichannel MPEG-1 Layer I AAC HE-AAC MPEG Surround MPEG-4 ALS MPEG-4 SLS MPEG-4 DST MPEG-4 HVXC MPEG-4 CELP USAC

ITU-T	G.711 G.718 G.719 G.722 G.722.1 G.722.2 G.723 G.723.1 G.726 G.728 G.729 G.729.1

Others	AC-3 AMR AMR-WB AMR-WB+ Apple Lossless Asao ATRAC CELT DRA DTS EVRC EVRC-B FLAC GSM-HR GSM-FR GSM-EFR iLBC iSAC Monkey's Audio TTA True Audio MT9 A-law µ-law Musepack OptimFROG Opus OSQ QCELP RealAudio RTAudio SD2 SHN SILK Siren SMV Speex SVOPC TwinVQ VMR-WB Vorbis WavPack WMA

Image

ISO/IEC/ITU-T	JPEG JPEG 2000 JPEG XR Lossless JPEG JBIG JBIG2 PNG TIFF/EP TIFF/IT

Others	APNG BMP DjVu EXR GIF ICER ILBM MNG PCX PGF TGA QTVR TIFF WBMP WebP

Containers

ISO/IEC	MPEG-PS MPEG-TS ISO base media file format MPEG-4 Part 14 Motion JPEG 2000 MPEG-21 Part 9

ITU-T	H.222.0 T.802

Others	3GP and 3G2 AMV ASF AIFF AVI AU Bink DivX Media Format DPX EVO Flash Video GXF M2TS Matroska MXF Ogg QuickTime File Format RealMedia REDCODE RAW RIFF Smacker MOD and TOD VOB WAV WebM

See Compression methods for methods and Compression software implementations for codecs

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