MPEG-4 - Revision history

DoesItReallyMatter: /* Further reading */ New section with link to 57-page MPEG-4 PDF (1999 publication) regarding MPEG-4 ISO/IEC standard, move other link to this section

2019-05-16T04:07:56Z

Further reading: New section with link to 57-page MPEG-4 PDF (1999 publication) regarding MPEG-4 ISO/IEC standard, move other link to this section

← Older revision		Revision as of 04:07, 16 May 2019
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	{{%}} vlc ''file.avi'' --[[sout]]='#[[transcode]]{vcodec=mp4v,acodec=mp4a}:std{access=file,mux=mp4,dst=''file.m4v''}'		{{%}} vlc ''file.avi'' --[[sout]]='#[[transcode]]{vcodec=mp4v,acodec=mp4a}:std{access=file,mux=mp4,dst=''file.m4v''}'

	MPEG-4 audio is an advanced, complicated audio format. It includes [[AAC]] for high bitrates, multilingual tracks, text-to-speech modes for very low bitrates, the ability to synthesize instrumental sounds (similar to [[MIDI]]), and more~~. See also the [http://sound.media.mit.edu/resources/mpeg4/audio/faq/mpeg4.html MPEG-4 Audio FAQ (2000 publication)]~~.		MPEG-4 audio is an advanced, complicated audio format. It includes [[AAC]] for high bitrates, multilingual tracks, text-to-speech modes for very low bitrates, the ability to synthesize instrumental sounds (similar to [[MIDI]]), and more.

	== Codecs ==		== Codecs ==
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	{{file\|modules/mux/mp4/mp4.c\|output muxer}}		{{file\|modules/mux/mp4/mp4.c\|output muxer}}
	{{file\|modules/demux/mp4/mp4.c\|input demuxer}}		{{file\|modules/demux/mp4/mp4.c\|input demuxer}}

			== Further reading ==
			* [https://sound.media.mit.edu/resources/mpeg4/audio/faq/mpeg4.html MPEG-4 Audio FAQ (2000 publication)]
			* [https://sound.media.mit.edu/resources/mpeg4/audio/general/w3156.pdf MPEG-4 ISO/IEC standard (1999 publication)]

DoesItReallyMatter: Add wikilinks

2019-03-25T07:56:27Z

Add wikilinks

← Older revision		Revision as of 07:56, 25 March 2019
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	{{%}} vlc ''file.avi'' --[[sout]]='#[[transcode]]{vcodec=mp4v,acodec=mp4a}:std{access=file,mux=mp4,dst=''file.m4v''}'		{{%}} vlc ''file.avi'' --[[sout]]='#[[transcode]]{vcodec=mp4v,acodec=mp4a}:std{access=file,mux=mp4,dst=''file.m4v''}'

	MPEG-4 audio is an advanced, complicated audio format. It includes AAC for high bitrates, multilingual tracks, text-to-speech modes for very low bitrates, the ability to synthesize instrumental sounds (similar to MIDI), and more. See also the [http://sound.media.mit.edu/resources/mpeg4/audio/faq/mpeg4.html MPEG-4 Audio FAQ (2000 publication)].		MPEG-4 audio is an advanced, complicated audio format. It includes [[AAC]] for high bitrates, multilingual tracks, text-to-speech modes for very low bitrates, the ability to synthesize instrumental sounds (similar to [[MIDI]]), and more. See also the [http://sound.media.mit.edu/resources/mpeg4/audio/faq/mpeg4.html MPEG-4 Audio FAQ (2000 publication)].

	== Codecs ==		== Codecs ==

DoesItReallyMatter: /* .mp4 audio */ Rename page anchor #Audio from #audio

2019-02-21T07:10:43Z

.mp4 audio: Rename page anchor #Audio from #audio

← Older revision		Revision as of 07:10, 21 February 2019
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	*http://forum.doom9.org/showthread.php?s=&threadid=62723		*http://forum.doom9.org/showthread.php?s=&threadid=62723

	=== <span id="~~audio~~"></span> .mp4 audio ===		=== <span id="Audio"></span> .mp4 audio ===
	'''.m4a''' is the [[file extension]] attached to names of files containing [[MPEG-4]] Audio. Generally, MPEG-4 files are have the '''.mp4''' file extension.		'''.m4a''' is the [[file extension]] attached to names of files containing [[MPEG-4]] Audio. Generally, MPEG-4 files are have the '''.mp4''' file extension.

DoesItReallyMatter: Improve link: sound.media.mit.edu has an archived copy of the publication, with other publications too

2019-02-06T09:33:44Z

Improve link: sound.media.mit.edu has an archived copy of the publication, with other publications too

← Older revision		Revision as of 09:33, 6 February 2019
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	{{%}} vlc ''file.avi'' --[[sout]]='#[[transcode]]{vcodec=mp4v,acodec=mp4a}:std{access=file,mux=mp4,dst=''file.m4v''}'		{{%}} vlc ''file.avi'' --[[sout]]='#[[transcode]]{vcodec=mp4v,acodec=mp4a}:std{access=file,mux=mp4,dst=''file.m4v''}'

	MPEG-4 audio is an advanced, complicated audio format. It includes AAC for high bitrates, multilingual tracks, text-to-speech modes for very low bitrates, the ability to synthesize instrumental sounds (similar to MIDI), and more. See also the [~~https://web.archive.org/web/20000818063551/~~http://~~www~~.~~tnt~~.~~uni-hannover~~.de/~~project~~/~~mpeg~~/audio/faq/mpeg4.html MPEG-4 Audio FAQ (2000 publication)].		MPEG-4 audio is an advanced, complicated audio format. It includes AAC for high bitrates, multilingual tracks, text-to-speech modes for very low bitrates, the ability to synthesize instrumental sounds (similar to MIDI), and more. See also the [http://sound.media.mit.edu/resources/mpeg4/audio/faq/mpeg4.html MPEG-4 Audio FAQ (2000 publication)].

	== Codecs ==		== Codecs ==

DoesItReallyMatter: Repair dead link

2019-02-06T09:27:28Z

Repair dead link

← Older revision		Revision as of 09:27, 6 February 2019
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	{{%}} vlc ''file.avi'' --[[sout]]='#[[transcode]]{vcodec=mp4v,acodec=mp4a}:std{access=file,mux=mp4,dst=''file.m4v''}'		{{%}} vlc ''file.avi'' --[[sout]]='#[[transcode]]{vcodec=mp4v,acodec=mp4a}:std{access=file,mux=mp4,dst=''file.m4v''}'

	MPEG-4 audio is an advanced, complicated audio format. It includes AAC for high bitrates, multilingual tracks, text-to-speech modes for very low bitrates, the ability to synthesize instrumental sounds (similar to MIDI), and more. See also the [http://www.tnt.uni-hannover.de/project/mpeg/audio/faq/mpeg4.html MPEG-4 Audio FAQ].~~{{dead link}}~~		MPEG-4 audio is an advanced, complicated audio format. It includes AAC for high bitrates, multilingual tracks, text-to-speech modes for very low bitrates, the ability to synthesize instrumental sounds (similar to MIDI), and more. See also the [https://web.archive.org/web/20000818063551/http://www.tnt.uni-hannover.de/project/mpeg/audio/faq/mpeg4.html MPEG-4 Audio FAQ (2000 publication)].

	== Codecs ==		== Codecs ==

DoesItReallyMatter: Unsetting page anchor #MPEG-4_audio; renaming anchor to #audio

2019-02-06T09:08:55Z

Unsetting page anchor #MPEG-4_audio; renaming anchor to #audio

← Older revision		Revision as of 09:08, 6 February 2019
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	*http://forum.doom9.org/showthread.php?s=&threadid=62723		*http://forum.doom9.org/showthread.php?s=&threadid=62723

	=== <span id="~~MPEG-4_audio~~"></span> .mp4 audio ===		=== <span id="audio"></span> .mp4 audio ===
	'''.m4a''' is the [[file extension]] attached to names of files containing [[MPEG-4]] Audio. Generally, MPEG-4 files are have the '''.mp4''' file extension.		'''.m4a''' is the [[file extension]] attached to names of files containing [[MPEG-4]] Audio. Generally, MPEG-4 files are have the '''.mp4''' file extension.

DoesItReallyMatter: Setting page anchor #MPEG-4_audio to ".mp4 audio"

2019-02-06T09:06:39Z

Setting page anchor #MPEG-4_audio to ".mp4 audio"

← Older revision		Revision as of 09:06, 6 February 2019
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	*http://forum.doom9.org/showthread.php?s=&threadid=62723		*http://forum.doom9.org/showthread.php?s=&threadid=62723

	=== .mp4 audio ===		=== <span id="MPEG-4_audio"></span> .mp4 audio ===
	'''.m4a''' is the [[file extension]] attached to names of files containing [[MPEG-4]] Audio. Generally, MPEG-4 files are have the '''.mp4''' file extension.		'''.m4a''' is the [[file extension]] attached to names of files containing [[MPEG-4]] Audio. Generally, MPEG-4 files are have the '''.mp4''' file extension.

DoesItReallyMatter: /* Codecs */ Change mod=ffmpeg → mod=avcodec. ffmpeg module was removed in 0.9.0

2019-02-02T06:03:48Z

Codecs: Change mod=ffmpeg → mod=avcodec. ffmpeg module was removed in 0.9.0

← Older revision		Revision as of 06:03, 2 February 2019
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	== Codecs ==		== Codecs ==
	{{codec audio\|id=mp4a\|altid=m4a\|mod=~~ffmpeg~~\|for=MPEG-4}}		{{codec audio\|id=mp4a\|altid=m4a\|mod=avcodec\|for=MPEG-4}}
	{{codec video\|id=mp4v\|altid=m4v\|mod=~~ffmpeg~~\|for=MPEG-4}}		{{codec video\|id=mp4v\|altid=m4v\|mod=avcodec\|for=MPEG-4}}

	MPEG-4 specifies a range of codecs		MPEG-4 specifies a range of codecs

DoesItReallyMatter: /* Protected MPEG-4 Audio */ -wl

2019-02-01T07:12:31Z

Protected MPEG-4 Audio: -wl

← Older revision		Revision as of 07:12, 1 February 2019
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	====Protected MPEG-4 Audio====		====Protected MPEG-4 Audio====
	When these files have [[digital restrictions management]] (DRM) applied to them, their extension are often changed to '''.m4p''', the ''p'' standing for ''protected''. Music files purchased from the [[iTunes Music Store]], for example, have this extension.		When these files have [[digital restrictions management]] (DRM) applied to them, their extension are often changed to '''.m4p''', the ''p'' standing for ''protected''. Music files purchased from the iTunes Music Store, for example, have this extension.

	====Audiobooks====		====Audiobooks====

DoesItReallyMatter: Fix wikilink

2019-01-27T06:05:13Z

Fix wikilink

← Older revision		Revision as of 06:05, 27 January 2019
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	{{mmwiki\|ISO MPEG-4}}		{{mmwiki\|ISO MPEG-4}}

	'''MPEG-4''' is a form of '''[[MPEG]]''' encoding. It is a flexible audio and video compression format. The format describes audio and video [[compression]], with a container format for streaming across networks and saving to disk. It also contains optional extra features, including [[DRM]] and [[subtitles]]. These extra features are only included in software if needed. MPEG-4 can provide better quality than MPEG-2 at low [[~~bitrates~~]].		'''MPEG-4''' is a form of '''[[MPEG]]''' encoding. It is a flexible audio and video compression format. The format describes audio and video [[compression]], with a container format for streaming across networks and saving to disk. It also contains optional extra features, including [[DRM]] and [[subtitles]]. These extra features are only included in software if needed. MPEG-4 can provide better quality than MPEG-2 at low [[bitrate]]s.

	Here is an example of how to transcode an AVI into an MPEG-4 video from the [[command prompt]]		Here is an example of how to transcode an AVI into an MPEG-4 video from the [[command prompt]]