Lossy - Revision history

Artoria2e5: /* Does Lossy Encoding Preserve Surround Information? */

2023-07-13T02:17:55Z

Does Lossy Encoding Preserve Surround Information?

← Older revision		Revision as of 02:17, 13 July 2023
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	Why does this happen?		Why does this happen?
	* Obviously, the [[bitrate]] controls how much sacrifice happens. Use higher bitrate to prevent this from happening. The lower the bitrate, the worse you can expect the surround imaging become.		* Obviously, the [[bitrate]] controls how much sacrifice happens. Use higher bitrate to prevent this from happening. The lower the bitrate, the worse you can expect the surround imaging become.
	* Multi-mono encoding processes each channel separately with no regard to the phase relationship between each channel, so phase errors are more likely to happen. Use [[joint stereo]] (or ~~matrixing~~ for more channels).		* Multi-mono encoding processes each channel separately with no regard to the phase relationship between each channel, so phase errors are more likely to happen. Use [[joint stereo]] (or matrix demixng for more channels).

	Mid/Side stereo of [[LAME]] or [[Advanced Audio Coding\|AAC]] does not destroy surround information. Also [[Musepack\|MPC]] preserves surround information with standard settings reasonably well.		Mid/Side stereo of [[LAME]] or [[Advanced Audio Coding\|AAC]] does not destroy surround information. Also [[Musepack\|MPC]] preserves surround information with standard settings reasonably well.

Artoria2e5: /* Does Lossy Encoding Preserve Surround Information? */

2023-07-13T02:13:49Z

Does Lossy Encoding Preserve Surround Information?

← Older revision		Revision as of 02:13, 13 July 2023
Line 10:		Line 10:
	Why does this happen?		Why does this happen?
	* Obviously, the [[bitrate]] controls how much sacrifice happens. Use higher bitrate to prevent this from happening. The lower the bitrate, the worse you can expect the surround imaging become.		* Obviously, the [[bitrate]] controls how much sacrifice happens. Use higher bitrate to prevent this from happening. The lower the bitrate, the worse you can expect the surround imaging become.
	* Multi-mono encoding processes each channel separately with no regard to the phase relationship between each channel, so phase errors are more likely to happen. Use [[joint stereo]] (or matrixing for ~~ambisonics~~).		* Multi-mono encoding processes each channel separately with no regard to the phase relationship between each channel, so phase errors are more likely to happen. Use [[joint stereo]] (or matrixing for more channels).

	Mid/Side stereo of [[LAME]] or [[Advanced Audio Coding\|AAC]] does not destroy surround information. Also [[Musepack\|MPC]] preserves surround information with standard settings reasonably well.		Mid/Side stereo of [[LAME]] or [[Advanced Audio Coding\|AAC]] does not destroy surround information. Also [[Musepack\|MPC]] preserves surround information with standard settings reasonably well.

Artoria2e5: /* Does Lossy Encoding Preserve Surround Information? */

2023-07-13T02:12:49Z

Does Lossy Encoding Preserve Surround Information?

← Older revision		Revision as of 02:12, 13 July 2023
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	== Does Lossy Encoding Preserve Surround Information? ==		== Does Lossy Encoding Preserve Surround Information? ==
	It's better to first ask "does lossy encoding preserve localization" at all. At high bitrates, yes. At lower bitrates, phase information gets sacrificed first, so the stereo image suffers. This applies also to surround-in-stereo formats ~~that use phase to hide surround into a stereo stream~~ (Dolby Pro Logic) [https://hydrogenaud.io/index.php/topic,4639 More discussion], ambisonics-in-stereo (UHJ), and raw B-format ambisonic.<ref>Phase/ambisonic issue discussed in: Mahé, Pierre; Ragot, Stéphane; Marchand, Sylvain (2 September 2019). ''[https://hal.science/hal-02289558 First-Order Ambisonic Coding with PCA Matrixing and Quaternion-Based Interpolation]''. 22nd International Conference on Digital Audio Effects (DAFx-19), Birmingham, UK. p. 284.</ref>		It's better to first ask "does lossy encoding preserve localization" at all. At high bitrates, yes. At lower bitrates, phase information gets sacrificed first, so the stereo image suffers. This applies also to surround-in-stereo formats (Dolby Pro Logic; [https://hydrogenaud.io/index.php/topic,4639 More discussion]), ambisonics-in-stereo (UHJ), and raw B-format ambisonic.<ref>Phase/ambisonic issue discussed in: Mahé, Pierre; Ragot, Stéphane; Marchand, Sylvain (2 September 2019). ''[https://hal.science/hal-02289558 First-Order Ambisonic Coding with PCA Matrixing and Quaternion-Based Interpolation]''. 22nd International Conference on Digital Audio Effects (DAFx-19), Birmingham, UK. p. 284.</ref>

	Why does this happen?		Why does this happen?

Artoria2e5: /* Does Lossy Encoding Preserve Surround Information? */

2023-07-13T02:12:19Z

Does Lossy Encoding Preserve Surround Information?

← Older revision		Revision as of 02:12, 13 July 2023
Line 6:		Line 6:

	== Does Lossy Encoding Preserve Surround Information? ==		== Does Lossy Encoding Preserve Surround Information? ==
	It's better to first ask "does lossy encoding preserve localization" at all. At high bitrates, yes. At lower bitrates, phase information gets sacrificed first. This applies also to surround-in-stereo formats that use phase to hide surround into a stereo stream (Dolby Pro Logic) [https://hydrogenaud.io/index.php/topic,4639 More discussion], ambisonics-in-stereo (UHJ), and raw ambisonic.<ref>Phase/ambisonic issue discussed in: Mahé, Pierre; Ragot, Stéphane; Marchand, Sylvain (2 September 2019). ''[https://hal.science/hal-02289558 First-Order Ambisonic Coding with PCA Matrixing and Quaternion-Based Interpolation]''. 22nd International Conference on Digital Audio Effects (DAFx-19), Birmingham, UK. p. 284.</ref>		It's better to first ask "does lossy encoding preserve localization" at all. At high bitrates, yes. At lower bitrates, phase information gets sacrificed first, so the stereo image suffers. This applies also to surround-in-stereo formats that use phase to hide surround into a stereo stream (Dolby Pro Logic) [https://hydrogenaud.io/index.php/topic,4639 More discussion], ambisonics-in-stereo (UHJ), and raw B-format ambisonic.<ref>Phase/ambisonic issue discussed in: Mahé, Pierre; Ragot, Stéphane; Marchand, Sylvain (2 September 2019). ''[https://hal.science/hal-02289558 First-Order Ambisonic Coding with PCA Matrixing and Quaternion-Based Interpolation]''. 22nd International Conference on Digital Audio Effects (DAFx-19), Birmingham, UK. p. 284.</ref>

	Why does this happen?		Why does this happen?

Artoria2e5: /* See Also */

2023-07-13T02:11:34Z

Artoria2e5: /* Does Lossy Encoding Preserve Surround Information? */

2023-07-13T02:11:23Z

Does Lossy Encoding Preserve Surround Information?

← Older revision		Revision as of 02:11, 13 July 2023
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	== Does Lossy Encoding Preserve Surround Information? ==		== Does Lossy Encoding Preserve Surround Information? ==
	~~Depending on the encoder and settings~~, ~~degradation of~~ surround ~~imaging may happen~~. ~~Use higher [[bitrate~~]~~] to prevent this from happening~~. ~~Mid~~/~~Side stereo of~~ [~~[LAME~~]~~] or [[Advanced~~ Audio ~~Coding\|AAC]] does not destroy surround information~~. ~~Also [[Musepack\|MPC]] preserves surround information with standard settings reasonably well~~. ~~The lower the [[bitrate]], the worse you can expect the surround imaging become~~.		It's better to first ask "does lossy encoding preserve localization" at all. At high bitrates, yes. At lower bitrates, phase information gets sacrificed first. This applies also to surround-in-stereo formats that use phase to hide surround into a stereo stream (Dolby Pro Logic) [https://hydrogenaud.io/index.php/topic,4639 More discussion], ambisonics-in-stereo (UHJ), and raw ambisonic.<ref>Phase/ambisonic issue discussed in: Mahé, Pierre; Ragot, Stéphane; Marchand, Sylvain (2 September 2019). ''[https://hal.science/hal-02289558 First-Order Ambisonic Coding with PCA Matrixing and Quaternion-Based Interpolation]''. 22nd International Conference on Digital Audio Effects (DAFx-19), Birmingham, UK. p. 284.</ref>

	* [~~https://hydrogenaud~~.io/~~index~~.~~php/topic,4639 More discussion~~]		Why does this happen?
			* Obviously, the [[bitrate]] controls how much sacrifice happens. Use higher bitrate to prevent this from happening. The lower the bitrate, the worse you can expect the surround imaging become.
			* Multi-mono encoding processes each channel separately with no regard to the phase relationship between each channel, so phase errors are more likely to happen. Use [[joint stereo]] (or matrixing for ambisonics).

			Mid/Side stereo of [[LAME]] or [[Advanced Audio Coding\|AAC]] does not destroy surround information. Also [[Musepack\|MPC]] preserves surround information with standard settings reasonably well.

	== List of common lossy formats ==		== List of common lossy formats ==

Artoria2e5: /* Does Lossy Encoding Preserve Surround Information? */ fix link

2023-07-13T01:56:39Z

Does Lossy Encoding Preserve Surround Information?: fix link

← Older revision		Revision as of 01:56, 13 July 2023
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	Depending on the encoder and settings, degradation of surround imaging may happen. Use higher [[bitrate]] to prevent this from happening. Mid/Side stereo of [[LAME]] or [[Advanced Audio Coding\|AAC]] does not destroy surround information. Also [[Musepack\|MPC]] preserves surround information with standard settings reasonably well. The lower the [[bitrate]], the worse you can expect the surround imaging become.		Depending on the encoder and settings, degradation of surround imaging may happen. Use higher [[bitrate]] to prevent this from happening. Mid/Side stereo of [[LAME]] or [[Advanced Audio Coding\|AAC]] does not destroy surround information. Also [[Musepack\|MPC]] preserves surround information with standard settings reasonably well. The lower the [[bitrate]], the worse you can expect the surround imaging become.

	* [~~http~~://~~www~~.~~hydrogenaudio.org/forums~~/index.php~~?act=ST&f=15&t=~~4639 More discussion]		* [https://hydrogenaud.io/index.php/topic,4639 More discussion]

	== List of common lossy formats ==		== List of common lossy formats ==

82.246.177.235: sort at the top of :Category:Codecs

2016-12-15T02:48:21Z

sort at the top of Category:Codecs

← Older revision		Revision as of 02:48, 15 December 2016
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	* [[Lossless]]		* [[Lossless]]

	[[Category:Codecs]]		[[Category:Codecs\|*]]

84.209.84.211: /* List of common lossy formats */

2012-12-12T09:31:25Z

List of common lossy formats

← Older revision		Revision as of 09:31, 12 December 2012
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	* [[MP3]]		* [[MP3]]
	* [[Musepack]] (also known as MPC, formerly known as MPEGplus or MP+)		* [[Musepack]] (also known as MPC, formerly known as MPEGplus or MP+)
			* [[Opus]]
	* (Ogg) [[Vorbis]]		* (Ogg) [[Vorbis]]
	* [[QDesign]]		* [[QDesign]]

Tahnru: added link for choosing a codec

2010-05-10T21:29:41Z

added link for choosing a codec

← Older revision		Revision as of 21:29, 10 May 2010
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	== See Also ==		== See Also ==
			* [[Choosing the best codec]]
	* [[Lossless]]		* [[Lossless]]


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

← Older revision		Revision as of 02:11, 13 July 2023
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	[[Category:Codecs\|*]]		[[Category:Codecs\|*]]
			<references/>