Porcuswiki: Two sacs

2024-03-22T11:47:58Z

Two sacs

← Older revision		Revision as of 11:47, 22 March 2024
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	{{stub}} '''Sac''' ~~is an apparently experimental [[lossless]]~~ audio [[codec]]~~. It comes with source code and a Windows 64~~-~~bit executable~~.		{{stub}} '''Sac''' can refer to (at least) one out of two lesser-known audio [[codec\|codecs]], which are not aimed at end-users.

	Sac ~~is arguably~~ not an ~~end-user codec~~, ~~lacking~~ pretty much all the features ~~those possess~~ (see the [[Lossless_comparison\|HA Wiki's Lossless Codec Comparison]]). Rather, ~~it seems to be~~ dedicated to achieving smaller file size than any other lossless codec ~~whatever~~ computing power ~~it might take. Thus, decoding~~ might fall severely short of real-time speeds: The developer uses as benchmark [[OptimFROG]]'s max preset~~<ref>https://github.com/slmdev/sac</ref>~~, which ~~has been measured to decode at around 4x realtime~~<ref>http://www.audiograaf.nl/losslesstest/Lossless%20audio%20codec%20comparison%20-%20revision%~~204~~.~~pdf~~</ref>; cursory testing indicates that Sac (v0.5.1) is order of magnitude ten times as CPU intensive. Independent comparison measured Sac does to smaller files size on average (but not all) material.<ref>http://www.squeezechart.com/audio.html</ref>		'''Sac''' – also referred to as ''State-of-the-Art lossless compression'' – by Sebastian Lehmann<ref>https://github.com/slmdev/sac Sebastian Lehmann's Sac at github</ref>: a [[lossless]] (on given architecture<ref>https://github.com/slmdev/sac/issues/7 Github issue: losslessness not preserved across CPU architectures</ref>) codec, described by the author as ''a lossless audio compression intended as a research project to find the limits on compression ratio''<ref>https://encode.su/threads/1137-Sac-(State-of-the-Art)-Lossless-Audio-Compression Lehmann's 2010 post at encode.su, updated</ref>. It comes with source code and a Windows 64-bit executable. <br/>
			Being a an experimental research project, it lacks pretty much all the features of an end-user codec (including playback support, see also the [[Lossless_comparison\|HA Wiki's Lossless Codec Comparison]]). Rather, Sac is dedicated to achieving smaller file size than any other lossless codec, at great expenses in computing power: Decoding might fall severely short of real-time speeds. The developer uses as benchmark [[OptimFROG]]'s max preset, which in the 2023 edition of Martin van Beurden's lossless test<ref>http://www.audiograaf.nl/losslesstest/Lossless%20audio%20codec%20comparison%20-%20revision%206%20-%20cdda.html Martijn van Beurden's 2023 lossless comparison study</ref> was measured to decode at 10x realtime speed on current hardware; cursory testing indicates that Sac (v0.5.1) is order of magnitude ten times as CPU intensive. Independent comparison measured Sac does to smaller files size on average (but not all) material.<ref>http://www.squeezechart.com/audio.html Squeezechart's comparison of (lossless) compressors</ref>

			'''Sac''' – ''Simple Audio Compression'' – by Marcus Geelnard<ref>https://www.bitsnbites.eu/hiqh-quality-dpcm-attempts Marcus Geelnard's 2014 blog post</ref>: a simple codec for 4-bit and 8-bit DDPCM. Released as a library.<ref>https://gitlab.com/mbitsnbites/libsac Marcus Geelnard's Sac at gitlab</ref>
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			'''References:'''

	<references/>		<references/>

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

Porcuswiki: Created page with "{{stub}} '''Sac''' is an apparently experimental lossless audio codec. It comes with source code and a Windows 64-bit executable. Sac is arguably not an end-user cod..."

2022-01-10T12:50:37Z

Created page with "{{stub}} '''Sac''' is an apparently experimental lossless audio codec. It comes with source code and a Windows 64-bit executable. Sac is arguably not an end-user cod..."

New page

{{stub}} '''Sac''' is an apparently experimental [[lossless]] audio [[codec]]. It comes with source code and a Windows 64-bit executable.

Sac is arguably not an end-user codec, lacking pretty much all the features those possess (see the [[Lossless_comparison|HA Wiki's Lossless Codec Comparison]]). Rather, it seems to be dedicated to achieving smaller file size than any other lossless codec whatever computing power it might take. Thus, decoding might fall severely short of real-time speeds: The developer uses as benchmark [[OptimFROG]]'s max preset<ref>https://github.com/slmdev/sac</ref>, which has been measured to decode at around 4x realtime<ref>http://www.audiograaf.nl/losslesstest/Lossless%20audio%20codec%20comparison%20-%20revision%204.pdf</ref>; cursory testing indicates that Sac (v0.5.1) is order of magnitude ten times as CPU intensive. Independent comparison measured Sac does to smaller files size on average (but not all) material.<ref>http://www.squeezechart.com/audio.html</ref>

<references/>

[[Category:Codecs]]

Sac - Revision history

Porcuswiki: Two sacs

Porcuswiki: Created page with "{{stub}} '''Sac''' is an apparently experimental lossless audio codec. It comes with source code and a Windows 64-bit executable. Sac is arguably not an end-user cod..."