Talk:List of codecs

message: I find it moderately disturbing that DSD/SACD are listed under "Pulse Density Modulation". This is incorrect, DSD is, was, and has always been an advanced form of Candy/Condon Sigma-Delta (or Delta-Sigma) if you choose, which means that it is a form of PCM with oversampling and noise shaping.  There are many forms of PDM that do not have the characteristics of Sigma-Delta, and it seems misleading to call it PDM, when in fact is is a very well known use of a very early technique, namely Sigma-Delta, which is, at its core, nothing more than PCM with noise shaping.  — Preceding unsigned comment added by Woodinville (talk • contribs) 01:39, 8 July 2014 (UTC)
thread_title: DSD

message: Where does AVS go?  —Preceding unsigned comment added by 129.215.101.110 (talk) 14:37, 20 June 2008 (UTC)
thread_title: AVS

message: Someone asked for some details of FORlive, so I've written some down below. Stephen B Streater 22:30, 20 May 2006 (UTC)
thread_title:  FORlive 

message: You can see an example of the FORlive codec here. This demo runs off a $100 PAL composite security camera, and has been running round the clock since 2004, except for brief intermissions for upgrades. As of May 2006, the current version has run non-stop for 14205010 seconds (see Java console) ie 164 days.
Stephen B Streater 22:30, 20 May 2006 (UTC)
thread_title:  Example of FORlive in action 

message: Someone asked for some details of FORtune, so I've written some down below. Stephen B Streater 22:36, 20 May 2006 (UTC)
thread_title:  FORtune 

message: You can see an example of the FORtune audio codec here.
Codec details to follow. Stephen B Streater 22:36, 20 May 2006 (UTC)
thread_title:  Example of FORtune in action 

message: The FORtune audio codec splits the audio into sections of around 10ms. These are then converted into frequency space and quantised. The FORtune codec takes into account how loud the sound is at any point to give a constant signal:noise ratio. The audio is compressed using a similar dynamic Huffman-like compression to the FORlive video, to take into account the type of sound at any point.
The player can play back on integer only CPUs such as the ARM widely used in mobile phones. A freely downloaded mobile phone application, FORmobile (currently being used by the British Army ), is available for playing back video/audio using an integer-only ARM implementation of the audio player (and an integer-only video player).
If the audio is being played in conjunction with video, for example with the FORlive streaming video codec or the FORscene video editing codec, it is seamlessly resynched every frame to ensure the video and audio can play over any period of time without slipping out of sync.
The Java implementation of the FORtune audio codec takes a few percent of the available CPU time on typical PCs, and is negligible compared with the CPU taken to play full frame rate video on the same machine.
Stephen B Streater 15:10, 21 May 2006 (UTC)
thread_title:  Some codec details 

message: Hello all.  I'm a newbie searching for information on AVCHD and MTS.  Should that not appear somewhere in this discussion?  Is it too new?  Thanks.  —Preceding unsigned comment added by 75.99.77.130 (talk) 17:48, 21 March 2010 (UTC)
thread_title:  AVCHD or MTS? 

message: Makes no sense, isn't claimed to be lossless by the company that makes it - citation was to a forum where people discuss how lossless RGB changes the chroma subsampling - not the same thing as having a lossless codec.  Not even sure why it said FFMPEG decoder, this doesn't just apply to just FRAPs codec either, why is it important what FFMPEG can or can't decode, what's that got to do with whether or not FRAPs (or other codecs) are lossless or not?
Maybe we'd have it as a lossless codec if the company's website said, FRAPs is a lossless codec.  I mean, if it were, surely it would be part of the advertised feature-set? 86.135.238.18 (talk) 18:48, 23 June 2012 (UTC)
replies: text: Would you look at that, I did a few tests, and it does look lossless.  I can't find a good citation though. 86.135.238.18 (talk) 19:33, 23 June 2012 (UTC)
thread_title:  FRAPs codec lossless, but only with FFMPEG decoder 

message: I've marked an unsourced claim that a codec is "very fast" with . Not sure whether it should be mentioned at all, since most codecs listed here have no information about speed or quality. —Frungi (talk) 19:56, 8 January 2013 (UTC)
replies: text: Removed. The Russian site (surprisingly as it may seem) is really one of the few available sources with reproducible video codec tests.--Regression Tester (talk) 01:12, 10 January 2013 (UTC)
thread_title:  "Very fast" 

message: The article appears to be a list of data formats (the first sentence even says so), not codecs  ("device or computer program capable of encoding or decoding"), so should be renamed accordingly. 203.176.108.99 (talk) 00:03, 20 February 2013 (UTC)
replies: text: I don't know what data formats are but the article definitely contains a (long) list of audio and video codecs.--Regression Tester (talk) 00:43, 20 February 2013 (UTC)
thread_title:  List of formats 

message: Should this be added to the list? 
New lossless audio codec launched Dec 2014. 
Company site 
3rd party news article covering launch 
Also mentioned in BBC Click episode 17-Jan-15 - iPlayer link   — Preceding unsigned comment added by 82.37.220.173 (talk) 12:02, 18 January 2015 (UTC)
thread_title:  MQA - Master Quality Authenticated 

message: How about a traditional list with required articles (no red links) and no references? –Be..anyone (talk) 21:40, 11 April 2016 (UTC)
thread_title:  EL collection (spam trap) 

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thread_title:  External links modified 

message: tl;dr: Should GIF be added to the lossless video list?  
I'm wondering if (animated) GIF should be added to the list of lossless video codecs.  
The pros are that it is very much a video format, it is lossless in that there is no generational loss, and for those videos for which it is well-suited (e.g. a limited color input where few pixels change between frames) it outperforms h264 lossless, h265 lossless, FFV1, MSU lossless, YULS, VP9-losless, and others by orders of magnitude, and does not require a x2, x4, or x8 size constraint.  
The cons are that there is a first-time loss (colors reduced to a maximum 256 color palette per frame - although GIFs can switch palettes throughout their run, this is rarely used), few video players support GIF files, and those that do rarely support seeking the timeline - even if the GIF is constructed so that there are full frames available.  
In terms of the first-time loss, this is true for most formats considered lossless, as they often convert color spaces from regular RGB or even 10bit RGB for their encoders to work well.  
Due to the extremely high compression ratio that can be reached for those specific cases for which other codecs are abysmally ill-suited, I would suggest that GIF be considered - but wanted to write my reasoning and seek feedback. Kmqz (talk) 22:48, 12 May 2018 (UTC)
replies: text: Well, it can be considered a video compression format. But this article is a list of video codecs. A video codec is not a video compression format. This is a list of software programs and libraries. GIF is not a codec, it is a format. So I guess it could be included, but only if the GIF section lists notable software implementations, which is what this article is really about.—J. M. (talk) 23:16, 12 May 2018 (UTC)
replies: text: Ah, gotcha. Yeah, it would be out of place here then (until such a time as that GIF's compression technique would be embraced for a proper codec, at which point it would no longer be GIF, but somethingLZWsomething).  Thanks for clarifying that. Kmqz (talk) 03:59, 13 May 2018 (UTC)
thread_title:  Lossless video - generational loss vs initial loss, and GIF 

message: reverted my attempt to move unnecessary detail from Video codec to this list. I know that this move created some overlap here and I hoped we could iron that out over time. I don't feel it would be a good idea to restore this material to Video codec so I'll reproduce it below. ~Kvng (talk) 18:33, 19 March 2019 (UTC)
thread_title:  List merge 

message: This Article is a List of Software called: CODECs
it is not Article containing list of dead mere Codecs Specification / Standard, it is list of Codecs, and that is software: Decoder and Encoder.
"Computer program" == is software!
** Essential Video Coding (EVC; MPEG-5 Part 1; developed; consumer products under-development)
*** REVC Encoder/Decoder of free base profile
*** XEVD (the eXtra-fast Essential Video Decoder) both main and base profile
*** XEVE (the eXtra-fast Essential Video Encoder) both main and base profile
** Low Complexity Enhancement Video Coding (LCEVC; MPEG-5 Part 2; developed; consumer products under-development)
*** FFmpeg (with support for over 20 base encoders)
*** Patch for AOSP
*** ExoPlayer (Android)
*** AVPlayer (iOS)
*** Microsoft UWP (Windows)
*** web players: HLS.js, Shaka Player, video.js
*** integration for HTML5 web browsers
*** lots of playback apps in Android/iOS/Microsoft stores
FFmpeg is mentioned next to almost every codec standard.
And some user change statement from true to false, by Writing that MPEG-5 codecs are under-development,
It is false, as Those 2 codecs are NOW fully developed.
Only Consumer Hardware is steel under development, or additional implementation in Software.— Preceding unsigned comment added by 46.187.199.166 (talk • contribs) 
:Yes, this article is a list of codecs—or more exactly, as the first sentence explains, a list of coding formats and codecs that implement the coding formats. Feel free to add codecs to the list, as long as you really understand what a codec is. For example, a player is not a codec. A web application or mobile playback applications are not codecs. An operating system is not a codec. A patch for an operating system is not a codec. And so on.
:Please make sure you really understand what this article is about, what a video coding format, audio coding format, video codec and audio codec is. For example, a codec does not necessarily have to be software, there are hardware codecs, too, or combinations of hardware and software. Please make sure you understand the difference between a standard an an implementation, and the difference between a codec library and application software (that uses the codecs). Please make sure you understand the logic of this article and its list—that is, a list of coding formats, where each item consists of a sublist containing codecs (i.e. encoding/decoding libraries) that implement the coding format in software.
:So, please, only add things to this article if you really understand what all these things mean.—J. M. (talk) 19:42, 31 August 2021 (UTC)
thread_title:  This Article is a List of Software called: CODECS