MPEG-4 ALS - Revision history

Porcuswiki: Wayback Machine-ified the links

2024-04-08T17:38:37Z

Wayback Machine-ified the links

← Older revision		Revision as of 17:38, 8 April 2024
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	== Links ==		== Links ==
	* [https://en.wikipedia.org/wiki/Audio_Lossless_Coding Wikipedia entry]		* [https://en.wikipedia.org/wiki/Audio_Lossless_Coding Wikipedia entry]
	* [https://www.nue.tu-berlin.de/menue/forschung/forschungsgebiete/datenkompression_und_uebertragung/mpeg_4_audio_lossless_coding_als/parameter/en/ MPEG-4 ALS website with source/executable download]		* [https://web.archive.org/web/20190321095222/https://www.nue.tu-berlin.de/menue/forschung/forschungsgebiete/datenkompression_und_uebertragung/mpeg_4_audio_lossless_coding_als/parameter/en/ MPEG-4 ALS website with source/executable download] now at the Wayback Machine
	* [http://www.nue.tu-berlin.de/menue/mitarbeiter/ehemalige_mitarbeiter/tilman_liebchen/lpac_-_lossless_audio_codec_for_windows_and_linux/ LPAC website]		* [https://web.archive.org/web/20120301090313/http://www.nue.tu-berlin.de:80/menue/mitarbeiter/ehemalige_mitarbeiter/tilman_liebchen/lpac_-_lossless_audio_codec_for_windows_and_linux LPAC website] at the Wayback machine
	* [https://www.nue.tu-berlin.de/fileadmin/fg97/03_Team/Liebchen/LPAC/lpacarc.html Further description of the LPAC algorithm]		* [https://web.archive.org/web/20190821043324/https://www.nue.tu-berlin.de/fileadmin/fg97/03_Team/Liebchen/LPAC/lpacarc.html Further description of the LPAC algorithm]
	* [https://www.rarewares.org/rrw/lpac.php LTAC/LPAC at ReallyRareWares]		* [https://www.rarewares.org/rrw/lpac.php LTAC/LPAC at ReallyRareWares]
	* [http://audiograaf.nl/downloads.html Martijn van Beurden's lossless performance tests (revision 4 for comparison to WavPack -hx, revisions 5 and 6 for non-CDDA)]		* [http://audiograaf.nl/downloads.html Martijn van Beurden's lossless performance tests (revision 4 for comparison to WavPack -hx, revisions 5 and 6 for non-CDDA)]

Porcuswiki: ffmpeg doesn't do float. And, why it doesn't do -z: source was not available.

2024-02-09T21:41:41Z

ffmpeg doesn't do float. And, why it doesn't do -z: source was not available.

Porcuswiki: ktf revision

2022-06-28T17:52:14Z

ktf revision

← Older revision		Revision as of 17:52, 28 June 2022
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	* [https://www.nue.tu-berlin.de/fileadmin/fg97/03_Team/Liebchen/LPAC/lpacarc.html Further description of the LPAC algorithm]		* [https://www.nue.tu-berlin.de/fileadmin/fg97/03_Team/Liebchen/LPAC/lpacarc.html Further description of the LPAC algorithm]
	* [https://www.rarewares.org/rrw/lpac.php LTAC/LPAC at ReallyRareWares]		* [https://www.rarewares.org/rrw/lpac.php LTAC/LPAC at ReallyRareWares]
	* [http://audiograaf.nl/downloads.html Martijn van Beurden's lossless performance test (revision 4)]		* [http://audiograaf.nl/downloads.html Martijn van Beurden's lossless performance test (revision 4 for comparison to WavPack -hx, revision 5 for non-CDDA)]
	* [[Lossless_comparison\|HA Wiki's Lossless Codec Comparison]] originally by [[User:Rjamorim\|Rjamorim]]		* [[Lossless_comparison\|HA Wiki's Lossless Codec Comparison]] originally by [[User:Rjamorim\|Rjamorim]]

Porcuswiki: Minor update due to ktf's revision 5, and the fact that channel count beats everything.

2022-06-28T17:50:10Z

Minor update due to ktf's revision 5, and the fact that channel count beats everything.

← Older revision		Revision as of 17:50, 28 June 2022
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	== Features and performance ==		== Features and performance ==
	The format supports both integer and 32-bit floating-point PCM, arbitrary sample rates and multi-channel (up to 65536). The reference encoder can enforce an MPEG-4 audio profile, but also provides for several parameters and two encoding modes. It can output the encoded stream in an MP4 container, or as .als files.		The format supports both integer and 32-bit floating-point PCM, arbitrary sample rates and multi-channel (up to 65536, higher than any widespread lossless codec). The reference encoder can enforce an MPEG-4 audio profile, but also provides for several parameters and two encoding modes. It can output the encoded stream in an MP4 container, or as .als files. By default it compresses files for full restore (not only lossless audio, but also recreating the original file bit by bit with the same metadata and structure) of WAVE and big-endian AIFF files.

	In [http://audiograaf.nl/downloads.html Martijn van Beurden's lossless performance test], the reference encoder (at default setting) did perform like other popular codecs (~~fairly close~~ comparable to WavPack's -hx setting). The higher compression settings encode very slowly. According to the README file, the "ALS reference software is not optimized, particularly not in terms of encoder speed."		In [http://audiograaf.nl/downloads.html Martijn van Beurden's lossless performance test], the reference encoder (at default setting) did perform like other popular codecs (comparable to WavPack's -hx setting at CDDA). The higher compression settings could encode very slowly, but can make for certain size gains on non-CDDA sources. According to the README file, the "ALS reference software is not optimized, particularly not in terms of encoder speed."

	== Software support ==		== Software support ==

Porcuswiki: linkification

2022-01-09T12:54:00Z

linkification

Porcuswiki: "Links"

2022-01-01T14:24:38Z

"Links"

← Older revision		Revision as of 14:24, 1 January 2022
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	LPAC was at some point relatively popular among lossless formats, as an encoder/decoder was available free of charge (for noncommercial purposes, and closed-source) for Windows, Linux and Solaris, along with a library that made integration of LPAC encoding and decoding into other applications relatively easy. Also for LPAC, the website offered instructions for [[Exact Audio Copy]] integration. Furthermore, LPAC was also much more efficient and featureful than the major lossless audio format of the 1990s, [[Shorten]].		LPAC was at some point relatively popular among lossless formats, as an encoder/decoder was available free of charge (for noncommercial purposes, and closed-source) for Windows, Linux and Solaris, along with a library that made integration of LPAC encoding and decoding into other applications relatively easy. Also for LPAC, the website offered instructions for [[Exact Audio Copy]] integration. Furthermore, LPAC was also much more efficient and featureful than the major lossless audio format of the 1990s, [[Shorten]].

	== ~~Addtional Reading~~ ==		== Links ==
	* [https://en.wikipedia.org/wiki/Audio_Lossless_Coding Wikipedia entry]		* [https://en.wikipedia.org/wiki/Audio_Lossless_Coding Wikipedia entry]
	* [https://www.nue.tu-berlin.de/menue/forschung/forschungsgebiete/datenkompression_und_uebertragung/mpeg_4_audio_lossless_coding_als/parameter/en/ MPEG-4 ALS website with source/executable download]		* [https://www.nue.tu-berlin.de/menue/forschung/forschungsgebiete/datenkompression_und_uebertragung/mpeg_4_audio_lossless_coding_als/parameter/en/ MPEG-4 ALS website with source/executable download]

Porcuswiki: Created page with "'''MPEG-4 Audio Lossless Coding''' ('''MPEG-4 ALS''') is a lossless audio format, extending the MPEG-4 Part 3 audio standard to allow lossless audio compression. First..."

2022-01-01T14:01:35Z

Created page with "'''MPEG-4 Audio Lossless Coding''' ('''MPEG-4 ALS''') is a lossless audio format, extending the MPEG-4 Part 3 audio standard to allow lossless audio compression. First..."

New page

'''MPEG-4 Audio Lossless Coding''' ('''MPEG-4 ALS''') is a [[lossless]] audio format, extending the [[MPEG-4]] Part 3 audio standard to allow lossless audio compression. First released in 2006, it is standardized as ISO/IEC 14496-3. A reference encoder is available as source code compilable for Windows/Linux/Mac, and a with an executable for Windows. Its primary developer was Tilman Liebchen, then at the Technische Universität Berlin.

The codec has not gained significant popularity and the reference encoder appears to be unmaintained since 2009.

== Features and performance ==

The format supports both integer and 32-bit floating-point PCM, arbitrary sample rates and multi-channel (up to 65536). The reference encoder can enforce an MPEG-4 audio profile, but also provides for several parameters and two encoding modes. It can output the encoded stream in an MP4 container, or as .als files.

In Martijn van Beurden's comparison test, the reference encoder (at default setting) did perform like other popular codecs (fairly close comparable to WavPack's -hx setting). The higher compression settings encode very slowly. According to the README file, the "ALS reference software is not optimized, particularly not in terms of encoder speed."

== Software support ==

The Windows executable can be integrated in e.g. [[Exact Audio Copy]] (instructions on the codec's website) or [[foobar2000]].

[[ffmpeg]] can decode MPEG-4 ALS files in the default encoding mode (currently not the -z mode).

There are currently no known hardware players supporting it.

== Predecessors: LPAC and LTAC ==

MPEG-4 ALS was based on Liebchen's earlier ''Lossless Predictive Audio Compression'' (''LPAC'') codec, which in turn succeeded his ''LTAC'' codec. Thus, LPAC development was frozen in 2003 in favour of MPEG-5 ALS development.

LPAC was at some point relatively popular among lossless formats, as an encoder/decoder was available free of charge (for noncommercial purposes, and closed-source) for Windows, Linux and Solaris, along with a library that made integration of LPAC encoding and decoding into other applications relatively easy. Also for LPAC, the website offered instructions for [[Exact Audio Copy]] integration. Furthermore, LPAC was also much more efficient and featureful than the major lossless audio format of the 1990s, [[Shorten]].

== Addtional Reading ==
* [https://en.wikipedia.org/wiki/Audio_Lossless_Coding Wikipedia entry]
* [https://www.nue.tu-berlin.de/menue/forschung/forschungsgebiete/datenkompression_und_uebertragung/mpeg_4_audio_lossless_coding_als/parameter/en/ MPEG-4 ALS website with source/executable download]
* [http://www.nue.tu-berlin.de/menue/mitarbeiter/ehemalige_mitarbeiter/tilman_liebchen/lpac_-_lossless_audio_codec_for_windows_and_linux/ LPAC website]
* [https://www.nue.tu-berlin.de/fileadmin/fg97/03_Team/Liebchen/LPAC/lpacarc.html Further description of the LPAC algorithm]
* [https://www.rarewares.org/rrw/lpac.php LTAC/LPAC at ReallyRareWares]
* [http://audiograaf.nl/downloads.html Martijn van Beurden's lossless performance test (revision 4)]
* [[Lossless_comparison|Lossless Codec Comparison]] originally by [[User:Rjamorim|Rjamorim]]

{{navbox audio codecs}}

[[Category:Codecs]]

← Older revision		Revision as of 21:41, 9 February 2024
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	'''MPEG-4 Audio Lossless Coding''' ('''MPEG-4 ALS''') is a [[lossless]] audio [[codec]], developed to extend the [[MPEG-4]] Part 3 audio standard to allow lossless audio compression. First released in 2006, it is standardized as ISO/IEC 14496-3. A reference encoder is available as source code compilable for Windows/Linux/Mac~~, and a with an executable for Windows~~. Its primary developer was Tilman Liebchen, then at the Technische Universität Berlin.		'''MPEG-4 Audio Lossless Coding''' ('''MPEG-4 ALS''') is a [[lossless]] audio [[codec]], developed to extend the [[MPEG-4]] Part 3 audio standard to allow lossless audio compression. First released in 2006, it is standardized as ISO/IEC 14496-3. A reference encoder is available as an executable for Windows, with the most significant part of the codec also being released as source code compilable for Windows/Linux/Mac. Its primary developer was Tilman Liebchen, then at the Technische Universität Berlin, and it was based on his earlier LPAC codec.

	The codec has not gained significant popularity and the reference encoder appears to be unmaintained since 2009.		The codec has not gained significant popularity and the reference encoder appears to be unmaintained since 2009. The current development team has however published several tests in (mainly) IEEE journals.

	== Features and performance ==		== Features and performance ==
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	== Software support ==		== Software support ==
	The Windows executable can be integrated in e.g. [[Exact Audio Copy]] (instructions on the codec's website) or [[foobar2000]].		The Windows executable can be integrated in e.g. [[Exact Audio Copy]] (instructions on the codec's website) or [[foobar2000]]. When used in an MP4 container, tagging is possible.

	[[ffmpeg]] can decode MPEG-4 ALS files in the default encoding mode ~~(currently not~~ the -z mode).		[[ffmpeg]] can decode MPEG-4 ALS files, fixed-point only, and only in the default encoding mode, which is the one documented with source. Unsupported are floating-point files, and the -z mode which was not published as source in the reference encoder/decoder.

	There are currently no known hardware players supporting it.		There are currently no known hardware players supporting it.

	== Predecessors: LPAC and LTAC ==		== Predecessors: LPAC and LTAC ==
	MPEG-4 ALS was based on Liebchen's earlier ''Lossless Predictive Audio Compression'' (''LPAC'') codec, which in turn succeeded his ''LTAC'' codec. Thus, LPAC development was frozen in 2003 in favour of MPEG-5 ALS development.		MPEG-4 ALS was based on Liebchen's earlier ''Lossless Predictive Audio Compression'' (''LPAC'') codec, which in turn succeeded his ''LTAC'' codec. Thus, LPAC development was frozen in 2003 in favour of MPEG-4 ALS development.

	LPAC was at some point relatively popular among lossless formats, as an encoder/decoder was available free of charge (for noncommercial purposes, and closed-source) for Windows, Linux and Solaris, along with a library that made integration of LPAC encoding and decoding into other applications relatively easy. Also for LPAC, the website offered instructions for [[Exact Audio Copy]] integration. Furthermore, LPAC was also much more efficient and featureful than the major lossless audio format of the 1990s, [[Shorten]].		LPAC was at some point relatively popular among lossless formats, as an encoder/decoder was available free of charge (for noncommercial purposes, and closed-source) for Windows, Linux and Solaris, along with a library that made integration of LPAC encoding and decoding into other applications relatively easy. Also for LPAC, the website offered instructions for [[Exact Audio Copy]] integration. Furthermore, LPAC was also much more efficient and featureful than the major lossless audio format of the 1990s, [[Shorten]].
Line 26:		Line 26:
	* [https://www.nue.tu-berlin.de/fileadmin/fg97/03_Team/Liebchen/LPAC/lpacarc.html Further description of the LPAC algorithm]		* [https://www.nue.tu-berlin.de/fileadmin/fg97/03_Team/Liebchen/LPAC/lpacarc.html Further description of the LPAC algorithm]
	* [https://www.rarewares.org/rrw/lpac.php LTAC/LPAC at ReallyRareWares]		* [https://www.rarewares.org/rrw/lpac.php LTAC/LPAC at ReallyRareWares]
	* [http://audiograaf.nl/downloads.html Martijn van Beurden's lossless performance ~~test~~ (revision 4 for comparison to WavPack -hx, ~~revision~~ 5 for non-CDDA)]		* [http://audiograaf.nl/downloads.html Martijn van Beurden's lossless performance tests (revision 4 for comparison to WavPack -hx, revisions 5 and 6 for non-CDDA)]
	* [[Lossless_comparison\|HA Wiki's Lossless Codec Comparison]] originally by [[User:Rjamorim\|Rjamorim]]		* [[Lossless_comparison\|HA Wiki's Lossless Codec Comparison]] originally by [[User:Rjamorim\|Rjamorim]]

← Older revision		Revision as of 12:54, 9 January 2022
Line 1:		Line 1:
	'''MPEG-4 Audio Lossless Coding''' ('''MPEG-4 ALS''') is a [[lossless]] audio ~~format~~, ~~extending~~ the [[MPEG-4]] Part 3 audio standard to allow lossless audio compression. First released in 2006, it is standardized as ISO/IEC 14496-3. A reference encoder is available as source code compilable for Windows/Linux/Mac, and a with an executable for Windows. Its primary developer was Tilman Liebchen, then at the Technische Universität Berlin.		'''MPEG-4 Audio Lossless Coding''' ('''MPEG-4 ALS''') is a [[lossless]] audio [[codec]], developed to extend the [[MPEG-4]] Part 3 audio standard to allow lossless audio compression. First released in 2006, it is standardized as ISO/IEC 14496-3. A reference encoder is available as source code compilable for Windows/Linux/Mac, and a with an executable for Windows. Its primary developer was Tilman Liebchen, then at the Technische Universität Berlin.

	The codec has not gained significant popularity and the reference encoder appears to be unmaintained since 2009.		The codec has not gained significant popularity and the reference encoder appears to be unmaintained since 2009.

	== Features and performance ==		== Features and performance ==

	The format supports both integer and 32-bit floating-point PCM, arbitrary sample rates and multi-channel (up to 65536). The reference encoder can enforce an MPEG-4 audio profile, but also provides for several parameters and two encoding modes. It can output the encoded stream in an MP4 container, or as .als files.		The format supports both integer and 32-bit floating-point PCM, arbitrary sample rates and multi-channel (up to 65536). The reference encoder can enforce an MPEG-4 audio profile, but also provides for several parameters and two encoding modes. It can output the encoded stream in an MP4 container, or as .als files.

	In Martijn van Beurden's ~~comparison~~ test, the reference encoder (at default setting) did perform like other popular codecs (fairly close comparable to WavPack's -hx setting). The higher compression settings encode very slowly. According to the README file, the "ALS reference software is not optimized, particularly not in terms of encoder speed."		In [http://audiograaf.nl/downloads.html Martijn van Beurden's lossless performance test], the reference encoder (at default setting) did perform like other popular codecs (fairly close comparable to WavPack's -hx setting). The higher compression settings encode very slowly. According to the README file, the "ALS reference software is not optimized, particularly not in terms of encoder speed."

	== Software support ==		== Software support ==

	The Windows executable can be integrated in e.g. [[Exact Audio Copy]] (instructions on the codec's website) or [[foobar2000]].		The Windows executable can be integrated in e.g. [[Exact Audio Copy]] (instructions on the codec's website) or [[foobar2000]].

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	== Predecessors: LPAC and LTAC ==		== Predecessors: LPAC and LTAC ==

	MPEG-4 ALS was based on Liebchen's earlier ''Lossless Predictive Audio Compression'' (''LPAC'') codec, which in turn succeeded his ''LTAC'' codec. Thus, LPAC development was frozen in 2003 in favour of MPEG-5 ALS development.		MPEG-4 ALS was based on Liebchen's earlier ''Lossless Predictive Audio Compression'' (''LPAC'') codec, which in turn succeeded his ''LTAC'' codec. Thus, LPAC development was frozen in 2003 in favour of MPEG-5 ALS development.

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	* [https://www.rarewares.org/rrw/lpac.php LTAC/LPAC at ReallyRareWares]		* [https://www.rarewares.org/rrw/lpac.php LTAC/LPAC at ReallyRareWares]
	* [http://audiograaf.nl/downloads.html Martijn van Beurden's lossless performance test (revision 4)]		* [http://audiograaf.nl/downloads.html Martijn van Beurden's lossless performance test (revision 4)]
	* [[Lossless_comparison\|Lossless Codec Comparison]] originally by [[User:Rjamorim\|Rjamorim]]		* [[Lossless_comparison\|HA Wiki's Lossless Codec Comparison]] originally by [[User:Rjamorim\|Rjamorim]]

	{{navbox audio codecs}}		{{navbox audio codecs}}

	[[Category:Codecs]]		[[Category:Codecs]]