Talk:Comparison of audio coding formats

message: I'm not sure, but are all the sample rates correct? WMA, for example, has 48000kHz. Isn't it 48kHz? Some other values are strange too. --200.165.128.150 14:42, 28 February 2006 (UTC)
replies: text: You probably confused about Hertz (Hz) and Kilohertz (kHz). 1000Hz = 1kHz. So, 48kHz is same as 48000Hz. RuzDD (talk) 21:36, 12 September 2023 (UTC)
thread_title:  Probably a mistake on the sample rates 

message: What do people here consider as reliable sources? My company has developed an audio codec which is mentioned in an article I am working on here, and would like to know where editors working on this comparison expect information to be published. Stephen B Streater 20:31, 9 June 2006 (UTC)
thread_title:  Reliable sources 

message: * DSD – Direct Stream Digital
* Pulse-density_modulation
* DoP – DSD over PCM
* RealAudio
* Dolby AC3
* OptimFROG
* Broadcom BroadVoice
Of course, there's more at hydrogenaudio, but there's a couple more.
: The article currently uses a different terminology and talks about formats. DSD and Pulse-density_modulation are kind of ways of encoding and describing the waveform, but do not describe any stream/file format or compression/decompression scheme like the others. So those should not be included. Realaudio, AC3, Optimfrog and Broadvoice are now also included. So this comment is pretty much obsolete. 80.221.244.224 (talk)  — Preceding undated comment added 21:43, 10 December 2023 (UTC)
thread_title:  More codecs that should be added. 

message: #For the purposes of this article, what is the difference between "BSD" and "Unix" (from the "Operating system support" section)?
#The statement "this enables their use on any POSIX-complaint system" (from the same section, footnotes) is misleading.  Typically, a string of other libraries is required (which are not part of POSIX), and some type of output system (ALSA, OSS, ...; also not part of POSIX).
#The use of "OSI" to refer to the open-source implementations is a bit confusing.  Simply because the OSI approved the licenses under which the software was published does not mean that they endorse that piece of software, nor that that piece of software has any other affiliation with OSI.  Perhaps "OSS" (open source software) or just "Open-source" would be more appropriate.
#Perhaps there should be some mention of whether samples are floating-point or integer in the heading "bits per sample" in the "Technical details" section.
#How exactly does WavPack do "2.2" bits per sample in lossy mode?  Does every fifth sample get an extra bit?
#Is a "Monaural" column really necessary?  Can it not be assumed that all audio formats support one channel of audio?
—Kbolino 10:03, 17 July 2006 (UTC)
thread_title:  Some issues 

message: I find it very unclear if we're comparing codecs or formats here. The title says “Comparison of audio codecs” while the table apparently compares formats — i.e. AAC to MP3 instead of LAME MP3 codec against Nero MP3 and QuickTime AAC. The table even has an “implementation” entry. Shouldn't the comparison be between those?  —Preceding unsigned comment added by 81.243.206.5 (talk) 10:43, 4 March 2008 (UTC)
replies: text: I agree that this article is not correct. Audio formats are not audio codecs. RealAudio is not a codec, it's multiple codecs that constitute a format. Some of the information here needs to be moved and/or deleted. Sapwood2 18:32, 13 April 2008 (UTC)
thread_title:  Comparing codecs or formats 

message: Where would ffdshow & ProRes 422 fall in this comparison? —IncidentFlux [ TalkBack | Contributions ] 17:37, 31 October 2008 (UTC)
thread_title:  [[ffdshow]] & [[ProRes 422]] 

message: Several references to "fp internally" are used in one table without any reference to what "fp" means.  Could someone in the know please clear this up?  User:Michael Daly --24.138.146.91 (talk) 02:39, 27 December 2008 (UTC)
replies: text: It means floating point. Although it's a little misleading: some formats (like MP3) that are usually implemented with floating point have fairly tight integer constraints internally and as a result don't have (much) more dynamic range than 16bit audio. --96.231.29.35 (talk) 17:08, 31 May 2009 (UTC)
replies: text: This is true but misses the point.  MP3 has no specific restraints on bits per sample output, and one can create a valid MP3 stream with > 16 bit dynamic range provided it is simple enough to fit into the bitrate available.  In reality mentioning a bits per sample for any MDCT codec is extremely misleading because dynamic range is defined in teh time domain, while these codecs are encoded in the frequency domain, so arbitrarily large dynamic range is possible for signals that are compact in time.  The reverse is also true, with signals being compact in frequency potentially having poor SNR when measured in time.  —Preceding unsigned comment added by 152.3.198.221 (talk) 02:33, 19 May 2010 (UTC)
thread_title:  FP means... 

message: can someone start a new article: list of low bit-rate speech codecs (codecs dedicated to voice compression only)? such codecs are significantly different than generic audio codecs, and lumping all of them together in one table is confusing and misleading.
speech codecs: AMR (and variants), ACELP, LPC-10 (FIPS 137), MELPe, IMBE, AMBE, CVSD, MELP, VSELP, and more.
suggested table columns: bitrate, latency, intelligibility score, usage in industry (ex: GSM, 3G, inmarsat, IS-54, public safety radio (APCO-25) etc)
i can fill the table if someone starts the article.
109.186.154.174 (talk) 15:52, 16 May 2010 (UTC)
thread_title:  low bit-rate speech codecs 

message: Why is Windows Media Player listed as a free encoder/decoder implementation of WMA but Quicktime isn't listed as a free encoder/decoder implementation of AAC 72.252.3.183 (talk) 16:53, 28 August 2010 (UTC)
replies: text: Good question. I think there's some issue with the MPEG group and royalties, but for the average end user QuickTime and Nero and FAAC/FAAD are all freely available. 12.106.190.70 (talk) 18:36, 30 June 2011 (UTC)
thread_title:  Free AAC implementation? 

message: Imo, the table does not need more columns, but the latest changes by D.scain.farenzena should be reverted, esp. since Lossless is an "application" in this context and the "No's" for Music are typically misleading. --Regression Tester (talk) 09:22, 13 September 2010 (UTC)
thread_title:  Columns in General Information 

message: I'm surprised that bit depth is not included in this comparison! --194.83.82.3 (talk) 12:36, 26 January 2012 (UTC)
thread_title:  Bit depth? 

message: These codecs are lossless. They use straight PCM encoding and so should not be included as lossy codecs. 192.91.191.162 (talk) 11:09, 2 August 2012 (UTC)
thread_title:  G.711 & G.711.1 are not lossy 

message: AIFF - Audio Interchange File Format  — Preceding unsigned comment added by 97.86.236.127 (talk) 14:33, 5 April 2013 (UTC)
thread_title:  Why no reference to Audio Interchange File Format? 

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thread_title:  External links modified 

message: I don't see information on Enhanced Voice Services codec...need to include it. I'll get to it if I can but anyone feel free to jump in.War (talk) 16:17, 30 May 2017 (UTC)
thread_title:  Include EVS Codec

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thread_title:  External links modified 

message: What is the music reproduction column based on? The Dolby family of codecs should have Yes in that column. They have comparable fidelity to MP3, and similar principle of operation. Audio and concert DVDs with AC-3 as a fallback codec are common, E-AC-3 is used for surround releases on current streaming aggregators. No music exists in LC3, Lyra or Satin (speech codec) formats.
DTS (Coherent Acoustics) seems to be missing in the main table. I'd add it, but I'm not familiar with patent/licensing status.
-- J7n (talk) 12:47, 8 November 2023 (UTC)
thread_title:  Music reproduction and DTS