Talk:MPEG-4

message: I removed the link http://www.theinquirer.net/?article=29679 from the bottom section because it seems to be having persistent redirect errors. I replaced it with a link from an "engadget.com" page, which is not a high quality link, but the best I could find in 5 minutes (my allotted time for such things). Please feel free to replace it, or put it back if/when the theinquirer.net link is healed. 
Tzf 20:32, 7 April 2006 (UTC)
replies: text: The link seems to work for me, but I've added a more interesting one so if the original one is unreliable, we can use yours and this new one. Stephen B Streater 22:06, 7 April 2006 (UTC)
thread_title: Unreliable

message: MPEG-4 is patented proprietary technology. This means that, although the software to create and play back MPEG-4 videos is easily available, a licence is needed to use it legally. I wonder if something should be mentioned about who owns MPEG-4, and how to license it. In particular, MPEG Licensing Authority can license some of the patents required for MPEG-4 visual (audio is more complex). Unfortunately, the one stop shop idea is currently open to doubt: this article claims that AT&T is suing companies such as Apple over alleged MPEG-4 patent infringement. Stephen B Streater 12:20, 18 February 2006 (UTC)
replies: text: Nice find. If this iPod supported all of part 2, it'd be the only device to ever do so! Personally I suspect many of the profiles have never been implemented (and never will be), but I've never attempted to verify this suspicion... Snacky 00:31, 20 August 2006 (UTC)
thread_title:  Licensing section 

message: MPEG-4 is patented proprietary technology. This means that, although the software to create and play back MPEG-4 videos may be readily available, a licence is needed to use it legally. Patents covering MPEG-4 are claimed by over two dozen companies. There is no simple way to license MPEG-4, but the MPEG Licensing Authority can license patents from a wide range of companies required for MPEG-4 visual techniques (audio is licensed separately). A one stop shop is currently not possible: this article claims that AT&T is suing companies such as Apple over alleged MPEG-4 patent infringement. This AT&T action against Apple illustrates that it is hard to know how many companies have patents covering MPEG-4.
Stephen B Streater 14:33, 27 February 2006 (UTC)
thread_title:  Proposed wording 

message: The article implies that SP and ASP are the only profiles of MPEG-4 Part 2 I however I know the following exist:     
* Core
* Main
* N-bit
* Advanced Coding Efficiency
* Core Scalable 
* Simple (SP)
* Simple Scalable
* Advanced Real Time Simple
* Advanced Scalable Texture
* Advanced Simple (ASP)
* Fine Granularity Scalable
Ref: http://www.m4if.org/resources/mpeg4userfaq.php#ArbitraryObjects
The MPEG-4 Part 2 article mentions 21 profiles. Because of this I think the claim that the 5G iPod supports all of part 2 may be incorrect. I'd like to see a citation that it supports all 21 profiles.
--70.39.108.127 05:30, 19 June 2006 (UTC)
replies: text: Nice find. If this iPod supported all of part 2, it'd be the only device to ever do so! Personally I suspect many of the profiles have never been implemented (and never will be), but I've never attempted to verify this suspicion... Snacky 00:31, 20 August 2006 (UTC)
thread_title:  Part 2 and Quicktime 

message: Lots of words, very little explaination. This article should be made much easier for people researching before buying an mpeg-4 player etc. The article should begin with a conscise definition of mpeg-4, continue onto what it encapsulates, file formats, comparison with other codecs.
If I have made technical mistakes, its because this article is misleading :P
Chris 05:28, 27 September 2006 (UTC)
thread_title:  Very confusing 

message: I'm not shopping for an mpeg-4 player, but I was hoping for some clues on how to recognize an mpeg-4 file.  Are specific extensions used?  Which?  Does the extension matter?  Also, can any mpeg-4 codec be used with any mpeg-4 file?  If not, why not?  —Preceding unsigned comment added by Preserved killick (talk • contribs) 21:16, 16 July 2008 (UTC)
thread_title:  File extensions?

message: What codec is being planned after MPEG-4? --24.249.108.133 21:47, 27 September 2006 (UTC)
replies: text: As of 2010, a new video standard is currently being developed under the name of High Efficiency Video Coding (or H.265 or H.264+), designed to succeed H.264/MPEG-4 AVC. However, it'll probably still fall under the MPEG-4 umbrella. In audio, due to lack of demand, most development takes the form of extensions to AAC, with the latest being MPEG-4 SLS (HD-AAC) and MPEG-4 ALS, both of which are still MPEG-4. The other parts of the standard are even more stagnant. C xong (talk) 01:01, 26 May 2010 (UTC)
thread_title:  What's next? 

message: As far as I know MPEG-4 is by Hong Kong University of Science and Technology.
http://www.ust.hk/~webopa/news/2000_News/news0613.html  —Preceding unsigned comment added by 58.153.0.155 (talk) 03:34, 28 October 2007 (UTC)
replies: text: Read the part that says "agreed upon by the ISO/IEC Moving Picture Experts Group (MPEG) under the formal standard ISO/IEC 14496". The organisation is ISO/IEC. Kegon (talk) 04:22, 16 January 2008 (UTC)
thread_title:  No inventor/organization's name? 

message: An ATI document provides an interesting graph of quality versus bitrate of H.264 and MPEG-2, which is what is (probably) intended by the statement "improved encoding efficiency" on the lead-in. Would this be suitable, or is a more rigorous comparison required? --Freeone3000 (talk) 17:44, 19 April 2010 (UTC)
replies: text: That document looks more like a marketing brochure than a technical document. Even though to video people it's blindingly obvious that MPEG-4 provides improved efficiency over MPEG-2, if it needs a citation it'll have to be from a better source. C xong (talk) 00:49, 26 May 2010 (UTC)
thread_title:  "Improved Coding Efficiency"  

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