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This is an old revision of this page, as edited by Mulligatawny (talk | contribs) at 21:09, 11 September 2014 (Confirmed the new comment). The present address (URL) is a permanent link to this revision, which may differ significantly from the current revision.

Usage in CCTV

I've added this to get people's opinions on the text which is repeatedly added and removed.

According to the MPEG group: “Generally speaking it is an unsafe policy to use these codecs for highly sensitive applications. For example, when taking a recording of an event and requiring a high resolution single frame (as might be the requirement in many circumstances) the possibility of achieving this with MPEG/H264 is unlikely – street scenes, shopping mall and anywhere single frame close identification is required should NOT be recorded using MPEG/H264 codecs. It should be noted that the MPEG committee is mainly concerned with video and audio for entertainment”.[1]

With the following assertion made by Ravana 999 "The quote is from 2004 and the tests were done in 2002 long before H.264 existed, this is simply not true today."

My opinion is that it may have been true at the time but the quality of encoders have greatly improved since then. So it should either be added with a statement to the effect of "This study from 2002 lead to this statement from 2004". J Darnley (talk) 14:02, 10 June 2011 (UTC)[reply]

References

  1. ^ [1].
My problem with this added text is that I believe there is a conflict-of-interest issue involved. The user continually re-adding it is a Single Purpose Account, and in my opinion they are adding the statement so that the existence of the text in this article reinforces their own company's sales pitch. Now that I know that the study is also outdated and likely incorrect, I see no reason for the statement to remain. --| Uncle Milty | talk | 14:52, 10 June 2011 (UTC)[reply]
I agree, there is a possible conflict, just look at the link used as source form the "ipsurveillance" user. Cantalamessa (talk) 22:43, 10 June 2011 (UTC)[reply]

I strongly suspect that the MPEG group never actually said what the referenced document claims that they said. The document does not provide a link to where the statement can be found on MPEG's web page, or a reference to any particular MPEG committee document number in which the statement can be found. In a web search for the quoted statement, all I find is a few things all apparently published by that same CCTV company/person. —Mulligatawny (talk) 23:18, 20 June 2011 (UTC)[reply]

I am the author of the paper quoted here, the statement came as a response to a number of questions raised by the UK IP User Group to the MPEG committee. I have no axe to grind we do not supply recording systems, we simply provide interconnectivity. I am not sure why anyone would think we as a group would make that up? — Preceding unsigned comment added by Polarismd (talk • contribs) 21:06, 22 May 2014 (UTC)[reply]

ALL-INTRA

Please someone elaborate in the article what ALL-INTRA USE means. 82.80.117.203 (talk) 10:32, 8 September 2011 (UTC)[reply]

It means only intra frames are allowed. J Darnley (talk) 09:49, 9 September 2011 (UTC)[reply]
Since no other comments have been added, I'm going to change the wording in that section. J Darnley (talk) 10:55, 1 October 2011 (UTC)[reply]

Hi10P

There is a redirect from Hi10P but nothing on Hi10P in the Artikle. — Preceding unsigned comment added by 95.112.155.148 (talk) 10:35, 28 September 2011 (UTC)[reply]

Yes there is, the High 10 profile: H.264/MPEG-4_AVC#Profiles. Whether this warrants the redirect is another matter. Is there anything else that "Hi10P" is used with/for? — Preceding unsigned comment added by J Darnley (talk • contribs) 17:47, 28 September 2011 (UTC)[reply]

"Profiles" section begins as gibberish, then deteriorates

The "Constrained Baseline Profile (CBP)... corresponds to the subset of features that are in common between the Baseline, Main, and High Profiles" and the "Baseline Profile... includes all features that are supported in the Constrained Baseline Profile, plus three additional features..." Sheesh! Could someone who actually knows something about H.264 please replace the "facts" in this section with some facts? Yappy2bhere (talk) 06:44, 28 November 2011 (UTC)[reply]

Heavy hardware requirements

I think something more should be mentioned about hardware requirements. My laptop has a Pentium 3 CPU and it can not decode H.264. Fewer and fewer Youtube videos is working, the majority is now only playing sound without motion pictures. A Pentium 3 CPU does not meet the hardware requirements and the article could mention the high demand on CPU resources, perhaps mention what the minimum requirements are. Urbanus Secundus (talk) 23:19, 20 December 2011 (UTC)[reply]

In a nutshell?

It would be useful if there was an "in a nutshell" of what the basic specs are for H.264/MPEG-AVC, or the possible defaults. So when someone comes to look at their settings, they can know what it would/could be. — billinghurst sDrewth 13:12, 20 January 2013 (UTC)[reply]

User experience

So often these types of articles focus on esoteric details, and this becomes the norm on Wikipedia. I think it is appropriate to have a section for ordinary users in ordinary language. For example, what browsers and media players presently accommodate this format, is the format supported natively or does it require add-ons, what is the timeline, will there be changes in image quality, is this format backwards compatible with older formats, or to put it another way, what formats will be unplayable or obsolete. I also like the suggestion by Urbanus Secundus to discuss the hardware implications. 3dimen (talk) 03:35, 21 January 2013 (UTC)[reply]

Yeah, and also, how we'll does the format compress? Not a mention anywhere of compression ratios. Incredible. — Preceding unsigned comment added by 75.156.118.183 (talk) 20:08, 23 March 2013 (UTC)[reply]

Controversies

Some Wikipedia editors, such as myself, prefer not to have a section titled "controversies", "criticisms", etc. -- see the WP:CSECTION essay. We recommend moving all the information currently in the "Controversies" section and to some other appropriate section of the article. --DavidCary (talk) 05:52, 18 January 2014 (UTC)[reply]

One possibility would be to change the heading from "Controversies" to "Usage in HTML5 and web browsers", and slightly adjust the content of the section to fit that topic. That's basically what is discussed in the section currently. —Mulligatawny (talk) 19:05, 12 June 2014 (UTC)[reply]

Merger proposal

The following discussion is closed. Please do not modify it. Subsequent comments should be made in a new section. A summary of the conclusions reached follows.
The result of this discussion was to keep both articles—J. M. (talk) 00:19, 24 June 2014 (UTC)[reply]

I propose that MPEG-4 be merged into H.264/MPEG-4 AVC. I think that the content in the MPEG-4 article is already covered by the H.264/MPEG-4 article, and the H.264/MPEG-4 article is more developed.Keithicus (talk) 15:01, 11 June 2014 (UTC)[reply]

  • Oppose - AVC is only a subset of MPEG-4, which includes other video and audio compression standards, container format and more (see the MPEG-4 Parts). These things are not and cannot be covered by the AVC article. I find this merger proposal nonsensical.—J. M. (talk) 01:37, 12 June 2014 (UTC)[reply]
  • Oppose - MPEG-4 covers the full suite of audio, video, and container formats developed under MPEG-4 umbrella, while this article only covers one specific part of the suite, that is MPEG-4 Part 10 "Advanced Video Coding". It makes no sense to merge them, no matter which article is more developed, they should remain separate entities. --95.25.221.124 (talk) 19:22, 17 June 2014 (UTC)[reply]
  • Oppose - My reason for opposition is the same, MPEG-4 is a superset to AVC/H.264. MPEG-4 is a FAMILY of AV standards, where as AVC/H.264 is a standard of video "V" coding. Pardon my word I'm so damned seeing this merger suggestion, I think you should take more time researching the topic before suggest something like this. Dannyniu (talk) 11:48, 23 June 2014 (UTC)[reply]
The discussion above is closed. Please do not modify it. Subsequent comments should be made on the appropriate discussion page. No further edits should be made to this discussion.

Reference for edit ([2])

For correcting the two max stored frames values in table "Levels with maximum property values" I referred to "Table A-7 – Maximum DPB size (frames) for some example frame sizes" in [1]. Seeing that specified values in the article are already largely sourced from this specification, and that inline citations only for the two changed values would have stood out, I didn't add any in the article. I trust this is in order, but please feel free to let me know if anything else is needed. Thanks. Fvisagie (talk) 16:01, 11 September 2014 (UTC)[reply]

References

  1. ^ "T-REC-H.264-201304-S!!PDF-E.pdf". Recommendation ITU-T H.264 Advanced video coding for generic audiovisual services. International Telecommunication Union. Retrieved 11 September 2014.
I confirmed that your edit matches the spec. That error seems to have been there ever since the maximum DPB size examples were added to the article (July 2006). At the time, that editor said "need to double-check". One or two errors in that edit were fixed soon after that, but I guess those two were overlooked for more than eight years! —Mulligatawny (talk) 21:09, 11 September 2014 (UTC)[reply]
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