World Library  
Flag as Inappropriate
Email this Article

Comparison of audio codecs

Article Id: WHEBN0025442271
Reproduction Date:

Title: Comparison of audio codecs  
Author: World Heritage Encyclopedia
Language: English
Subject: Codec, Data compression, MP3, Vorbis, Windows Media Audio, RealAudio, Speex, G.723.1, G.711, Advanced Audio Coding
Collection:
Publisher: World Heritage Encyclopedia
Publication
Date:
 

Comparison of audio codecs

The following tables compare general and technical information for a variety of audio formats and audio compression formats. For listening tests comparing the perceived audio quality of audio formats and codecs, see the article Codec listening test.

General information

General Information about Audio Compression Formats - creator/company, license/price etc.
Audio compression format Creator First public release date Latest stable version Encoder cost Player cost Proprietary implementations (codecs) Open-source implementations (codecs) Application (besides consumer audio) Music reproduction (consumer audio) Telephony app Lossless audio compression Patented DRM
AAC ISO/IEC MPEG Audio Committee 1997 ISO/IEC 14496-3 Non-free[1] Non-free[1] FAAC (encoding only), iTunes, Nero Digital Audio FAAD2 (decoding only), FFmpeg, Android OpenCORE AAC (decoding only),[2] Audiocogs[3] (decoding only) Digital TV service, Internet streaming Yes No No Non-free Yes Non-free FairPlay (.m4p only, discontinued)
AC-3 Dolby Laboratories 1992 ATSC A52:2012 Non-free Non-free DVD players, digital television FFmpeg, liba52 (decoding only), Aften (encoding only), libavc (2.0 channels max) Theatrical movie presentation, Digital TV service & home-video (personal recorders, DVD, etc.) No No No Non-free Yes ?
ALAC Apple Inc. 2004-04-28 QuickTime 7.6 Free Free QuickTime, iTunes, RealPlayer MacOSforge, FFmpeg, Audiocogs[4] (decoding only) - Music archival Yes Yes Free Possible, but never implemented
ALS ISO/IEC MPEG Audio Committee 2005 ISO/IEC 14496-3 Free Free mp4als FFmpeg (decoding only) - - No Yes Non-free Yes ?
AMBE Digital Voice Systems  ?  ? Non-free Non-free  ?  ? Low bandwidth HF/VHF digital radio, VoIP trunking No No No Non-free Yes  ?
AMR 3GPP 1999-06-22 ETSI TS 126 071 V9.0.0 (2009) Non-free[5][6] Non-free[5][6] QuickTime, RealPlayer FFmpeg (decoding only), FFmpeg with OpenCORE libraries,[7] Android[8] voice recording No Yes No Non-free Yes No
AMR-WB
(G.722.2)
3GPP 2001-04-10 ETSI TS 126 190 V8.0.0 (2009-01) Non-free Non-free QuickTime, RealPlayer FFmpeg (decoding only),[7] FFmpeg with VisualOn libraries, Android (decoding only),[8] opencore-amr for both encoding and decoding voice recording No Yes No Non-free Yes No
AMR-WB+ 3GPP 2004-06-14 ETSI TS 126 290 V8.0.0 (2009-01) Non-free[9][10] Non-free[9][10]  ?  ? voice recording Yes Yes No Non-free Yes No
apt-X APTX 1989 2007 Non-free Non-free Broadcast audio codecs: Systembase, APT, AVT, Harris Corporation, MAYAH, Prodys, Qbit; wireless headphones: iSkin, JayBird Gear, DTS discs for movies ? Low latency Studio/transmitter link, Bluetooth A2DP stereo, digital wireless microphone Yes Yes No Non-free Yes No
ATRAC Sony Corp. 1991 ATRAC3plus Non-free Non-free MiniDisc, Walkman, VAIO, Clie, PlayStation 3, PlayStation Portable, SDDS, SonicStage, SoundForge, RealPlayer, ConnectPlayer FFmpeg (decoding only, ATRAC3plus and ATRAC Advanced Lossless are not supported) voice recording, theatrical movie presentation - No Yes Non-free Yes Non-free Yes
BroadVoice Broadcom 2009-08-19  ? Free Free  ?  ? Speech, VoIP, Low latency, voice recording No Yes No Free No
CELT Xiph.Org Foundation, Jean-Marc Valin 2007-12-08 0.11.1 Free Free libcelt, FFmpeg with libcelt library (decoding only) Speech, VoIP, Low latency, Studio/transmitter link, wireless audio Yes Yes No No No
Codec2 David Rowe 2010  ? Free Free c2enc, c2dec Low bandwidth HF/VHF digital radio, VoIP trunking No Yes No No No
Enhanced AC-3 Dolby Laboratories ? ATSC A52:2012 Non-free Non-free Digital television FFmpeg Theatrical movie presentation, digital TV service & home-video (personal recorders, DVD, etc.) No No No Non-free Yes ?
FLAC Xiph.Org Foundation, Josh Coalson 2001-07-20 1.3.0 Free Free FLAC,[11] Flake[12] (encoding only), FFmpeg, FLACCL[13] (encoding only), Audiocogs[14] (decoding only) - - Yes Yes No No
G.711 ITU-T 1972 (ITU-T standard from 1988) G.711 Appendix II (02/00) Free Free Various proprietary VoIP software FFmpeg, Ekiga, Asterisk (PBX) and almost any VoIP software voice recording No Yes No No No
G.722 ITU-T 1988-11 Free Free Various proprietary VoIP software Asterisk (PBX), QuteCom, FFmpeg voice recording No Yes No No No
G.722.1 ITU-T 1999-09 G.722.1 (05/05) Free[15][16] Free[15][16] Various proprietary VoIP software FreeSWITCH,[17] PJSIP, etc voice recording No Yes No Non-free Yes No
G.722.2
(AMR-WB)
ITU-T (adopted directly from 3GPP) 2002-01 G.722.2 (07/03) Non-free Non-free QuickTime, RealPlayer FFmpeg (decoding only),[7] FFmpeg with VisualOn libraries, Android (decoding only)[8] voice recording, audio No No No Non-free Yes No
G.723.1 ITU-T 1996-03 G.723.1 (05/06) Non-free Non-free Various proprietary VoIP software FFmpeg voice recording No Yes No Non-free Yes No
G.726 ITU-T 1990-12 Free Free Various proprietary VoIP software FFmpeg, Ekiga and other VoIP software voice recording No Yes No No No
G.728 ITU-T 1992-09 Non-free Non-free Various proprietary VoIP software voice recording No Yes No Non-free Yes No
G.729 ITU-T 1996-03 G.729 (01/07) Non-free Non-free Various proprietary VoIP software FFmpeg (decoding only) voice recording No Yes No Non-free Yes No
GSM-FR ETSI Special Mobile Group 1990-1994 (ETS 300 580-2) ETSI EN 300 961 V8.1.1 (2000–11) Free Free FFmpeg (decoding only), FFmpeg with external library libgsm, Ekiga and other VoIP software voice recording No Yes No  ? No
iLBC Global IP Solutions 2002 Free Free Cisco IP Communicator,[18] old versions of Skype[19] Ekiga, Asterisk (PBX) and other VoIP software, FFmpeg with libilbc library voice recording No Yes No No?[20] No
iSAC Global IP Solutions  ? Free Free Yahoo! Messenger WebRTC voice recording No Yes No Free[21]  ?
Monkey's Audio Matthew T. Ashland 2000 4.12 Free Free Monkey's Audio FFmpeg (decoding only) ? ? No Yes ? No
MP3 ISO/IEC MPEG Audio Committee 1993 ISO/IEC 11172-3, ISO/IEC 13818-3 Non-free (See notes) Non-free (See notes) FhG, l3enc, MP3enc, (old implementations: Xing TOMPG, SCMPX) LAME (encoding only), FFmpeg (decoding only), libmad (decoding only), Audiocogs[22] (decoding only), (old implementations: BladeEnc) - Yes No No Non-free Yes
(but see notes)
Non-free Yes (optional, rarely used)
MP2 (MPEG-1, 2 Audio Layer II) ISO/IEC MPEG Audio Committee 1993 ISO/IEC 11172-3, ISO/IEC 13818-3 Non-free Non-free various DVD software, video software, audio software TooLAME (encoding only), TwoLAME (encoding only), FFmpeg DAB, DVB, DVD Yes No No Free No[23]  ?
Musepack Frank Klemm/MDT 1997 1.30 (2009-04-02) Free Free Musepack,[24] FFmpeg (decoding only) - Yes No No No No
Nellymoser Asao Nellymoser Inc. 2002  ? Non-free Non-free Adobe Flash, Flash Player FFmpeg voice recording No No No Non-free Yes  ?
Opus IETF 2012-09-11 RFC 6716 (libopus 1.0.3) Free Free libopus, FFmpeg with libopus library Speech, VoIP, Low latency, Studio/transmitter link, wireless audio Yes Yes No royalty-free[25] No
Shorten Tony Robinson 1999-06-02 1. Free Free Shorten FFmpeg (decoding only) - - No Yes No No
SILK Skype Limited 2009-01-07 Free Free Skype voice recording No No No Non-free Yes ?
Siren 7 PictureTel Corp. (now Polycom Inc.) 1999 ?[15][16] ?[15][16] Microsoft Office Communicator FreeSWITCH (libg722_1,[26] aMSN (libsiren - part of libmsn)[27][28] voice recording No Yes No Non-free Yes ?
Speex Xiph.Org Foundation, Jean-Marc Valin 2003-03-24 1.1.12 Free Free Adobe Flash Player 10 Speex,[29] FFmpeg with libspeex library voice recording No Yes No No No
SVOPC Skype Limited 2007 ? ? Skype voice recording No Yes No Non-free Yes ?
TwinVQ Nippon Telegraph and Telephone 1996 (?) Non-free Non-free Winamp with VQF plugin, NTT TwinVQ player/encoder, Yamaha SoundVQ player, Nero Media Player FFmpeg (decoding only)[30] speech Yes No No Non-free Yes ?
Vorbis (Ogg) Xiph.Org Foundation 2000-05-11 1.3.2 Free Free libvorbis,[31] aoTuV,[32] FFmpeg - Yes No No No No
WavPack Conifer Software 1998 4.60.1 Free Free WavPack,[33] FFmpeg (decoding only) - - Yes Yes No No
Windows Media Audio Microsoft 1999 11.0 Free Windows Media Encoder[34] Free for licensees of the Windows operating system [35] Windows Media Player, Windows Media Encoder FFmpeg (decoding only for Pro, Lossless and Voice) internet streaming Yes No Yes Non-free Yes Non-free[36]
Audio compression format Creator First public release date Latest stable version Encoder cost Player cost Proprietary implementations (codecs) Open-source implementations (codecs) Application App: Music App: telephony Lossless audio compression Patented DRM

Notes

  1. The 'Music' category is merely a guideline on commercialized uses of a particular format, not a technical assessment of its capabilities. (For example, in terms of marketshare, MP3 and AAC dominate the personal audio market, though many other formats are comparably well suited to fill this role from a purely technical standpoint.)
  2. First public release date is first of either specification publishing or source releasing, or in the case of closed-specification, closed-source codecs, is the date of first binary releasing. Many developing codecs have pre-releases consisting of pre-1.0 versions and perhaps 1.0 release candidates (RCs), although 1.0 may not necessarily be the release version.
  3. Latest stable version is that of specification or reference tools.
  4. If there happens to be OSI licensed software available for a particular format, this does not necessarily permit one to use said codec free of charge. Likewise, if there is only proprietary licensed software available for a particular format, one might be able to use the codec free of charge.
  5. MP3 licence and patent status: The MP3 format is patented and therefore subject to license (expires latest: 2017). However with multiple contenders for the patent, it is far from certain in the market who is the patent holder with the right to set pricing and royalties. A MP3#Licensing and patent issues.

Operating system support

Audio codec OS support
Codec Windows Mac OS X GNU/Linux BSD Unix Palm OS Symbian OS Rockbox
AAC Yes Yes Yes Yes Yes Yes Yes Yes
ALAC Yes Yes Yes Yes Yes No No Yes
apt-X Yes Yes Yes Yes Yes No No No
CELT Yes Yes Yes Yes Yes Yes No Yes
FLAC Yes Yes Yes Yes Yes Yes Yes Yes
Monkey's Audio Yes Yes Yes Yes Yes No No Yes
MP3 Yes Yes Yes Yes Yes Yes Yes Yes
Musepack Yes Yes Yes Yes Yes Yes Yes Yes
Opus Yes Yes Yes Yes Yes No No Yes
RealAudio[37] Yes Yes Yes Yes Yes Yes Yes Yes
Speex Yes Yes Yes Yes Yes Yes Yes Yes
Vorbis Yes Yes Yes Yes Yes Yes Yes Yes
WavPack Yes Yes Yes Yes Yes Yes Yes Yes
WMA[37] Yes Yes[38] Yes Yes Yes Yes Yes Yes

Multimedia frameworks support

Multimedia Frameworks Support for Audio Compression Formats
Audio compression format ACM DirectShow QuickTime GStreamer FFmpeg
8SVX Yes (ffdshow) Yes (ffdshow) Yes (Perian) Yes (GStreamer FFmpeg plug-in) Yes
AAC Yes (ffdshow) Yes (ffdshow, Monogram[39]) Yes Yes (GStreamer FFmpeg plug-in) Yes
HE-AAC Yes (ffdshow) Yes (ffdshow, Monogram[39]) Yes No Yes
AC3 Yes (ffdshow) Yes (ffdshow) Yes (Perian) Yes (GStreamer FFmpeg plug-in) Yes
E-AC-3 Yes (ffdshow) Yes (ffdshow) Yes (Perian) Yes (GStreamer FFmpeg plug-in) Yes
AMR No No Yes

[40] [41]

Yes (GStreamer Ugly Plug-ins) Yes
Apple Lossless Yes (ffdshow) Yes (ffdshow) Yes Yes (GStreamer FFmpeg plug-in) Yes
Cook Codec Yes (ffdshow) Yes (ffdshow) Yes (Perian) Yes (GStreamer FFmpeg plug-in) Yes
ATRAC3 Yes (ffdshow) Yes (ffdshow) Yes (Perian) Yes (GStreamer FFmpeg plug-in) Yes
ATRAC3plus No No No No No
DCA aka DTS Yes (ffdshow) Yes (ffdshow) Yes (Perian) Yes (GStreamer FFmpeg plug-in) Yes
DTS-HD No No No No No
FLAC Yes (ffdshow) Yes (ffdshow) Yes (Perian) Yes (GStreamer Base Plug-ins, GStreamer FFmpeg plug-in) Yes
Monkey's Audio Yes (ffdshow) Yes (ffdshow) Yes (Perian) Yes (GStreamer FFmpeg plug-in) Yes
WavPack Yes (ffdshow) Yes (ffdshow) Yes (Perian) Yes (GStreamer FFmpeg plug-in) Yes
Shorten Yes (ffdshow) Yes (ffdshow) Yes (Perian) Yes (GStreamer FFmpeg plug-in) Yes
Sonic Audio Yes (ffdshow) Yes (ffdshow) Yes (Perian) Yes (GStreamer FFmpeg plug-in) Yes
MP3 Yes (ffdshow) Yes Yes Yes (GStreamer Ugly, GStreamer FFmpeg plug-in) Yes
RealAudio Yes (ffdshow) Yes (ffdshow) Yes (Perian) Yes (GStreamer FFmpeg plug-in, GStreamer DLL loader plugin + Binary Codec Packages) Yes
Speex Yes (ffdshow) Yes (ffdshow) Yes (Perian) Yes (GStramer Good Plug-ins, GStreamer FFmpeg plug-in) Yes
Vorbis Yes (ffdshow) Yes (ffdshow) Yes (Perian) Yes (GStreamer Base Plug-ins, GStreamer FFmpeg plug-in) Yes
La No No No No No
LPAC No No No No No
Windows Media Audio v1 Yes (ffdshow) Yes Yes (Perian) Yes (GStreamer FFmpeg plug-in) Yes
Windows Media Audio v2 Yes (ffdshow) Yes Yes (Perian) Yes (GStreamer FFmpeg plug-in) Yes
Windows Media Audio Pro Yes (ffdshow) Yes Yes (Perian) Yes (GStreamer FFmpeg plug-in) Yes
Windows Media Audio Lossless No Yes Yes (flip4mac) Yes (GStreamer FFmpeg plug-in) Yes
Windows Media Audio Voice No Yes No No Yes
Musepack Yes (ffdshow) Yes (ffdshow, Monogram[39]) Yes (Perian) Yes (GStreamer FFmpeg plug-in) Yes
Meridian Lossless Packing Yes (ffdshow) Yes (ffdshow) Yes (Perian) Yes (GStreamer FFmpeg plug-in) Yes
Nellymoser Asao Codec in Flash Yes (ffdshow) Yes (ffdshow) Yes (Perian) Yes (GStreamer FFmpeg plug-in) Yes
OptimFROG No No No No No
Truespeech Yes (ffdshow) Yes (ffdshow) Yes (Perian) Yes (GStreamer FFmpeg plug-in) Yes
TTA Yes (ffdshow) Yes (ffdshow) Yes (Perian) Yes (GStreamer FFmpeg plug-in) Yes
QCELP Yes (ffdshow) Yes (ffdshow) Yes Yes (GStreamer FFmpeg plug-in) Yes
Audio compression format ACM DirectShow QuickTime GStreamer FFmpeg

Technical details

Technical Details of Lossy Audio Compression Formats
Audio compression format Algorithm Sample Rate Bit rate Latency CBR VBR Stereo Multichannel
AAC MDCT, Hybrid Subband (AAC-HE) 8 kHz to 192 kHz[42] 8 to 529 kbit/s (stereo) 20–405ms[43] Yes Yes Yes: Dual, Mid/Side, Intensity, Parametric Yes: Up to 48 channels
AC3 MDCT 32, 44.1, 48 kHz 32 to 640 kbit/s 40.6 ms Yes No Yes Yes: Up to 6 channels
AMBE  ? 8 kHz 2 and 9.6 kbit/s  ?  ?  ?  ?  ?
AMR ACELP 8 kHz 4.75, 5.15, 5.90, 6.70, 7.40, 7.95, 10.20, 12.20 kbit/s 25ms Yes Yes No No
AMR-WB
(G.722.2)
ACELP 16 kHz 6.60–23.85 kbit/s
(6.60, 8.85, 12.65, 14.25, 15.85, 18.25, 19.85, 23.05 or 23.85 kbit/s)
25 ms Yes Yes Yes: only in MPEG-4 Part 12 container No
AMR-WB+ ACELP 8, 11.025, 16, 22.05, 32, 44.1, 48 kHz 6 kbit/s to 36 kbit/s (mono) 7 kbit/s to 48 kbit/s (stereo) 60–90 ms Yes Yes Yes No
apt-X Subband 24 kHz to 48 kHz (stereo) 192 kbit/s to 384 kbit/s (stereo) 2 ms Yes (4:1) No Yes Yes: Up to 8 channels
ATRAC1 MDCT-Hybrid Subband Various 292 kbit/s >100 ms Yes No Yes: Dual Only No
ATRAC3 MDCT-Hybrid Subband Various 132/66 kbit/s >100 ms Yes No Yes: Dual (LP2), Mid/Side (LP4) No
ATRAC3plus MDCT-Hybrid Subband Various 48–352 kbit/s >100 ms Yes  ? Yes Yes: Up to 6 channels
CELT MDCT 32 to 96 kHz 24 kbit/s[44] to >1 Mbit/s 2–14.5 ms (8.9 ms typical) Yes No Yes Yes
Codec2 Speech 8 kHz 1200 bit/s, 1400 bit/s, 2400 bit/s, 2550 bit/s 20–40 ms Yes No No No
GSM-HR VSELP 8 kHz 5.6 kbit/s 25 ms Yes No No No
GSM-FR RPE-LTP 8 kHz 13 kbit/s 20–30 ms Yes No No No
GSM-EFR ACELP 8 kHz 12.2 kbit/s 20-30ms Yes No No No
HVXC Speech 8 kHz 2 or 4 kbit/s 36 ms Yes Yes No No
iLBC Block Independent LPC 8 kHz 13.33, 15.20 kbit/s 20, 30 ms Yes No No No
iSAC Transform coding 16 kHz or 32 kHz 10–52 kbit/s 33–63 ms Yes Yes No No
MP3 (MPEG-1, 2, 2.5 Audio Layer III) MDCT, Hybrid Subband 8, 11.025, 12, 16, 22.05, 24, 32, 44.1, 48 kHz 8, 16, 24, 32, 40, 48, 56, 64, 80, 96, 112, 128, 144, 160, 192, 224, 256, 320 kbit/s >100 ms Yes Yes Yes: Dual, Mid/Side, Intensity No
MPEG-1 Audio Layer II (MP2) Subband 32, 44.1, 48 kHz 32, 48, 56, 64, 80, 96, 112, 128, 160, 192, 224, 256, 320, 384 kbit/s Yes Yes: but decoders are not required to support it Yes: Dual, Intensity No
MPEG-2 Audio Layer II (MP2) Subband 16, 22.05, 24 kHz[45][46] 8, 16, 24, 32, 40, 48, 56, 64, 80, 96, 112, 128, 144, 160 kbit/s[45] Yes Yes: but decoders are not required to support it Yes Yes: up to 5 full range audio channels and an LFE-channel with MPEG Multichannel
Musepack Subband 32, 37.8, 44.1, 48 kHz 3 to 1300 kbit/s ? No Yes Yes Yes: Up to 8 channels
Opus (Hybrid mode) Hybrid (CELP+MDCT) 8 to 48 kHz 6 to 510 kbit/s 10 to 20 ms Yes Yes Yes Yes: Up to 255 channels[47]
Opus (LP Layer) LPC 8 kHz 8-12 kbit/s (@ 20 ms) 10 to 60 ms (+ 5 ms look-ahead + 1.5 ms additional delay) Yes Yes Yes Yes: Up to 255 channels[47]
Opus (MDCT Layer) CELT 8–48 kHz 8-128 kbit/s (@ 20 ms) 2.5 to 20 ms (+2.5 ms look-ahead) Yes Yes Yes Yes: Up to 255 channels[47]
RealAudio MDCT, Varies (see article) Varies (see article) Varies Yes Yes Yes Yes: Up to 6 channels
SILK LTP 8, 12, 16, 24 kHz 6 to 40 kbit/s 25 ms Yes ? ? ?
Siren 7 Derived from PT716plus, MLT 16 kHz 16, 24, 32 kbit/s 40 ms Yes No No No
Siren 14 MLT 32 kHz 24, 32, 48 kbit/s (mono), 48, 64, 96 kbit/s (stereo) 40 ms Yes No Yes No
Siren 22 MLT 48 kHz 32, 48, 64 kbit/s (mono), 64, 96, 128 kbit/s (stereo) 40 ms Yes No Yes No
Speex CELP 8, 16, 32, (48) kHz 2.15 to 24.6 kbit/s (NB); 4 to 44.2 kbit/s (WB) 30ms (NB) 34ms (WB) Yes Yes Yes: Intensity Yes
VMR-WB ACELP 16 kHz 8.55, 4.0, 0.8, 13.3, 6.2, 2.7, 1.0 33.75 ms Yes Yes ? ?
Vorbis (Ogg) MDCT 1 Hz to 200 kHz variable >100 ms Yes/ABR Yes Yes: Dual, Lossless, Phase, Point (Intensity) Yes: Up to 255 channels
WavPack Lossy Prediction, Quantization 1 Hz to 16.777216 MHz 196 kbit/s and up in lossy mode (for CD audio) ? Yes Yes Yes Yes: Up to 256 channels
Windows Media Audio Standard MDCT 8, 11.025, 16, 22.05, 32, 44.1, 48 kHz 8–768 kbit/s >100 ms Yes Yes Yes No
Windows Media Audio Pro MDCT 8, 11.025, 16, 22.05, 32, 44.1, 48, 88.2, 96 kHz 4–768 kbit/s >100 ms Yes Yes Yes Yes: At least 8 channels, expandable
Technical Details of Lossless Audio Compression Formats
Audio compression format Algorithm Sample Rate Bits per sample Latency Stereo Multichannel
ALAC Lossless 1 Hz to 384000 Hz 16, 20, 24, 32[48] ? Yes Yes: Up to 8 channels
FLAC Lossless 1 Hz to 655350 Hz 8, 16, 20, 24, 32 4.3–92 ms (46.4 ms typical) Yes Yes: Up to 8 channels
Monkey's Audio Lossless 8, 11.025, 12, 16, 22.05, 24, 32, 44.1, 48, 96 kHz 8, 16, 24 ? Yes No
RealAudio Lossless Lossless Varies (see article) Varies (see article) Varies Yes Yes: Up to 6 channels
True Audio Lossless 0–4 GHz 1 to > 64 ? Yes Yes: Up to 65535 channels
WavPack Lossless Lossless, Hybrid 1 Hz to 16.777216 MHz Varies in lossless mode; supports 32-bit float input; 2.2 minimum in lossy mode ? Yes Yes: Up to 256 channels
Windows Media Audio Lossless Lossless 8, 11.025, 16, 22.05, 32, 44.1, 48, 88.2, 96 kHz 16, 24 >100 ms Yes Yes: Up to 6 channels
Technical Details of ITU-T Audio Compression Formats
Audio compression format Algorithm Sample Rate Bit rate[49] Bits per sample Latency CBR VBR Stereo Multichannel
G.711 companding A-law or μ-law, PCM, Lossy 8 kHz 64 kbit/s 8 bit 125 µs (typical) Yes No No No
G.711.1 MDCT, A-law, μ-law, Lossy 8 or 16 kHz 64, 80, 96 kbit/s 16 bit 11.875 ms Yes Yes No No
G.718 CELP, MDCT, Lossy 8 or 16 kHz 8, 12, 12.65, 16, 24, 32 kbit/s 16 bit 42.875–43.875 ms Yes Yes No No
G.718B CELP, MDCT, Lossy, Sinusoidal Coding 32 kHz 36, 40, 48 kbit/s 16 bit 49.625 ms Yes Yes No No
G.719 Lossy, (incorporates elements of Siren Codec and Ericsson technology) 48 kHz 32-128 kbit/s
(Rates between 32 and 88 kbit/s shall be a multiple of 4 kbit/s; 88-128 kbit/s - a multiple of 8 kbit/s.)
16 bit 40 ms Yes No Yes: only in MPEG-4 Part 12 container Yes: only in MPEG-4 Part 12 container
G.721 ADPCM, Lossy 8 kHz 32 kbit/s 13 bit Yes No No No
G.722 sub-band ADPCM, Lossy 16 kHz 64 kbit/s
(comprises 48, 56 or 64 kbit/s audio and 16, 8 or 0 kbit/s auxiliary data)
14 bit 4 ms Yes No No No
G.722.1 Modulated Lapped Transform, (based on Siren Codec), Lossy 16 kHz 24, 32 kbit/s 16 bit 40 ms Yes No No No
G.722.1C Modulated Lapped Transform, (based on Siren Codec), Lossy 32 kHz 24, 32, 48 kbit/s 16 bit 40 ms Yes No No No
G.722.2 (AMR-WB) multi-rate wideband ACELP, Lossy 16 kHz 6.60–23.85 kbit/s
(6.60, 8.85, 12.65, 14.25, 15.85, 18.25, 19.85, 23.05 or 23.85 kbit/s)
14 bit 25 ms Yes Yes Yes: only in MPEG-4 Part 12 container No
G.723 ADPCM, Lossy 8 kHz 24 or 40 kbit/s 13 bit Yes No No No
G.723.1 MP-MLQ, ACELP, Lossy 8 kHz 5.3, 6.3 kbit/s 13 bit 37.5 ms Yes No No No
G.726 ADPCM, Lossy 8 kHz 16, 24, 32, 40 kbit/s 13 bit 125 µs Yes No No No
G.727 ADPCM, Lossy 8 kHz 16, 24, 32, 40 kbit/s 13 bit Yes Yes No No
G.728 low-delay CELP, Lossy 8 kHz 16 kbit/s 13 bit 0.625 ms Yes No No No
G.729 CS-ACELP, Lossy 8 kHz 8 kbit/s 13 bit 15 ms Yes No No No
G.729D CS-ACELP, Lossy 8 kHz 6.4 kbit/s 13 bit Yes No No No
G.729E CS-ACELP, Lossy 8 kHz 11.8 kbit/s 13 bit 15 ms Yes No No No
G.729.1 CELP, TDBWE, TDAC, Lossy 8 or 16 kHz 8–32 kbit/s
(12 layers; 2 kbit/s steps, (10 kbit/s omitted))
16 bit 48.9375 ms Yes Yes No No

Notes

  • The latency listed here is the total delay (frame size, plus all lookahead) at the normal operating sample rate (typically 44.1 kHz).

See also

Free software portal

Notes and references

External links

  • Comparative test April, 2004
  • EBU subjective listening tests on low-bitrate audio codecs
  • Hydrogenaudio comparison of lossless formats
  • Tsabary, Eldad. “CEC.
  • Rodman, Jeffrey "VoIP to 20 kHz: Codec Choices for High Definition Voice Telephony" (July, 2008)
This article was sourced from Creative Commons Attribution-ShareAlike License; additional terms may apply. World Heritage Encyclopedia content is assembled from numerous content providers, Open Access Publishing, and in compliance with The Fair Access to Science and Technology Research Act (FASTR), Wikimedia Foundation, Inc., Public Library of Science, The Encyclopedia of Life, Open Book Publishers (OBP), PubMed, U.S. National Library of Medicine, National Center for Biotechnology Information, U.S. National Library of Medicine, National Institutes of Health (NIH), U.S. Department of Health & Human Services, and USA.gov, which sources content from all federal, state, local, tribal, and territorial government publication portals (.gov, .mil, .edu). Funding for USA.gov and content contributors is made possible from the U.S. Congress, E-Government Act of 2002.
 
Crowd sourced content that is contributed to World Heritage Encyclopedia is peer reviewed and edited by our editorial staff to ensure quality scholarly research articles.
 
By using this site, you agree to the Terms of Use and Privacy Policy. World Heritage Encyclopedia™ is a registered trademark of the World Public Library Association, a non-profit organization.
 


Copyright © World Library Foundation. All rights reserved. eBooks from Project Gutenberg are sponsored by the World Library Foundation,
a 501c(4) Member's Support Non-Profit Organization, and is NOT affiliated with any governmental agency or department.