LAME -q switch - Revision history

Mjb: /* External links */ updated link to current documentation

2024-04-05T16:18:29Z

External links: updated link to current documentation

← Older revision		Revision as of 16:18, 5 April 2024
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	==External links==		==External links==
	* [~~http~~://~~lame~~.~~cvs~~.~~sourceforge~~.net/~~viewvc~~/lame/lame/doc/html/detailed.html#q Current documentation]		* [https://svn.code.sf.net/p/lame/svn/trunk/lame/doc/html/detailed.html#q Current documentation]
	* [http://www.hydrogenaud.io/forums/index.php?showtopic=101132 Research & discussion that led to this summary] (2013)		* [http://www.hydrogenaud.io/forums/index.php?showtopic=101132 Research & discussion that led to this summary] (2013)
	* [http://www.hydrogenaud.io/forums/index.php?showtopic=107424 More discussion mainly re: ABR] (2014)		* [http://www.hydrogenaud.io/forums/index.php?showtopic=107424 More discussion mainly re: ABR] (2014)

Mjb: /* External links */ link formatting fixes

2014-11-07T16:52:16Z

External links: link formatting fixes

← Older revision		Revision as of 16:52, 7 November 2014
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	==External links==		==External links==
	* [http://lame.cvs.sourceforge.net/viewvc/lame/lame/doc/html/detailed.html#q]Current documentation~~[/url~~]		* [http://lame.cvs.sourceforge.net/viewvc/lame/lame/doc/html/detailed.html#q Current documentation]
	* [http://www.hydrogenaud.io/forums/index.php?showtopic=101132]Research & discussion that led to this summary~~[/url~~] (2013)		* [http://www.hydrogenaud.io/forums/index.php?showtopic=101132 Research & discussion that led to this summary] (2013)
	* [http://www.hydrogenaud.io/forums/index.php?showtopic=107424]More discussion re: ABR~~[/url~~] (2014)		* [http://www.hydrogenaud.io/forums/index.php?showtopic=107424 More discussion mainly re: ABR] (2014)

Mjb: +link to docs

2014-11-07T16:51:21Z

+link to docs

← Older revision		Revision as of 16:51, 7 November 2014
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	==External links==		==External links==
			* [http://lame.cvs.sourceforge.net/viewvc/lame/lame/doc/html/detailed.html#q]Current documentation[/url]
	* [http://www.hydrogenaud.io/forums/index.php?showtopic=101132]Research & discussion that led to this summary[/url] (2013)		* [http://www.hydrogenaud.io/forums/index.php?showtopic=101132]Research & discussion that led to this summary[/url] (2013)
	* [http://www.hydrogenaud.io/forums/index.php?showtopic=107424]More discussion re: ABR[/url] (2014)		* [http://www.hydrogenaud.io/forums/index.php?showtopic=107424]More discussion re: ABR[/url] (2014)

Mjb: It's nice to know where this came from

2014-11-07T16:48:12Z

It's nice to know where this came from

← Older revision		Revision as of 16:48, 7 November 2014
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	\| 9 \|\| Normal \|\| No \|\| ? \|\| -1 \|\| No \|\| 0 \|\| 0 \|\| align="left" \| Disables almost all algorithms including psy-model. Extremely fast. OK quality.		\| 9 \|\| Normal \|\| No \|\| ? \|\| -1 \|\| No \|\| 0 \|\| 0 \|\| align="left" \| Disables almost all algorithms including psy-model. Extremely fast. OK quality.
	\|}		\|}

			==External links==
			* [http://www.hydrogenaud.io/forums/index.php?showtopic=101132]Research & discussion that led to this summary[/url] (2013)
			* [http://www.hydrogenaud.io/forums/index.php?showtopic=107424]More discussion re: ABR[/url] (2014)

95.31.179.104 at 23:28, 17 September 2014

2014-09-17T23:28:21Z

← Older revision		Revision as of 23:28, 17 September 2014
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	! -q n !! Huffman coding search !! Use full outer loop for Huffman encoding !! sv_qnt.substep_shaping !! Subblock gain !! Noise-shaping !! Amplification !! Stopping !! Description		! -q n !! Huffman coding search !! Use full outer loop for Huffman encoding !! sv_qnt.substep_shaping !! Subblock gain !! Noise-shaping !! Amplification !! Stopping !! Description
	\|-		\|-
	\| 0 \|\| Best \|\| Yes \|\| 2 \|\| 1 \|\| Yes \|\| 2 \|\| 1 \|\| align="left" \| Use all the slowest, parameters/algorithms that are available.		\| 0 \|\| Best \|\| Yes \|\| 2 \|\| 1 \|\| Yes \|\| 2 \|\| 1 \|\| align="left" \| Use all the slowest parameters/algorithms that are available.
	\|-		\|-
	\| 1 \|\| Best \|\| No \|\| 2 \|\| 1 \|\| Yes \|\| 2 \|\| 1 \|\|		\| 1 \|\| Best \|\| No \|\| 2 \|\| 1 \|\| Yes \|\| 2 \|\| 1 \|\|

95.31.179.104 at 23:23, 17 September 2014

2014-09-17T23:23:34Z

← Older revision		Revision as of 23:23, 17 September 2014
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	==Effects==		==Effects==
	This table documents the parameters that are affected by the value assigned to -q. These are most relevant to CBR for the reasons noted above.		This table documents the parameters that are affected by the value assigned to -q. '''These are most relevant to CBR''' for the reasons noted above.
	{\| border=1 class="wikitable" style="text-align:center"		{\| border=1 class="wikitable" style="text-align:center"
	! -q n !! Huffman coding search !! Use full outer loop for Huffman encoding !! sv_qnt.substep_shaping !! Subblock gain !! Noise-shaping !! Amplification !! Stopping !! Description		! -q n !! Huffman coding search !! Use full outer loop for Huffman encoding !! sv_qnt.substep_shaping !! Subblock gain !! Noise-shaping !! Amplification !! Stopping !! Description
	\|-		\|-
	\| 0 \|\| Best \|\| Yes \|\| 2 \|\| 1 \|\| Yes \|\| 2 \|\| 1 \|\| align="left" \| Use all the ~~"best", and~~ slowest, parameters/algorithms that are available.		\| 0 \|\| Best \|\| Yes \|\| 2 \|\| 1 \|\| Yes \|\| 2 \|\| 1 \|\| align="left" \| Use all the slowest, parameters/algorithms that are available.
	\|-		\|-
	\| 1 \|\| Best \|\| No \|\| 2 \|\| 1 \|\| Yes \|\| 2 \|\| 1 \|\|		\| 1 \|\| Best \|\| No \|\| 2 \|\| 1 \|\| Yes \|\| 2 \|\| 1 \|\|
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	\| 3 \|\| Best \|\| No \|\| ? \|\| 1 \|\| Yes \|\| 1 \|\| 1 \|\| align="left" \| Default value. Good speed, good quality. Lower values of -q may not produce significantly higher quality.		\| 3 \|\| Best \|\| No \|\| ? \|\| 1 \|\| Yes \|\| 1 \|\| 1 \|\| align="left" \| Default value. Good speed, good quality. Lower values of -q may not produce significantly higher quality.
	\|-		\|-
	\| 4 \|\| Best \|\| No \|\| ? \|\| 1 \|\| Yes \|\| 0 \|\| 0 \|\|		\| 4 \|\| Best \|\| No \|\| ? \|\| 1 \|\| Yes \|\| 0 \|\| 0 \|\| align="left" \| Optimal speed/quality. Usually produce less distortion at high frequencies than all other values of -q, except 5-6.
	\|-		\|-
	\| 5-6 \|\| Normal \|\| No \|\| ? \|\| 1 \|\| Yes \|\| 0 \|\| 0 \|\|		\| 5-6 \|\| Normal \|\| No \|\| ? \|\| 1 \|\| Yes \|\| 0 \|\| 0 \|\| align="left" \| Almost the same as -q4.
	\|-		\|-
	\| 7-8 \|\| Normal \|\| No \|\| ? \|\| -1 \|\| No \|\| 0 \|\| 0 \|\| align="left" \| Same as -f. Very fast, ~~best~~ quality~~, better keep high frequency~~. Psychoacoustics are used for pre-echo and mid/side stereo, but no noise-shaping is done.		\| 7-8 \|\| Normal \|\| No \|\| ? \|\| -1 \|\| No \|\| 0 \|\| 0 \|\| align="left" \| Same as -f. Very fast, OK quality. Psychoacoustics are used for pre-echo and mid/side stereo, but no noise-shaping is done.
	\|-		\|-
	\| 9 \|\| Normal \|\| No \|\| ? \|\| -1 \|\| No \|\| 0 \|\| 0 \|\| align="left" \| Disables almost all algorithms including psy-model.		\| 9 \|\| Normal \|\| No \|\| ? \|\| -1 \|\| No \|\| 0 \|\| 0 \|\| align="left" \| Disables almost all algorithms including psy-model. Extremely fast. OK quality.
	\|}		\|}

176.15.222.141: /* Effects */

2014-08-12T01:09:36Z

Effects

← Older revision		Revision as of 01:09, 12 August 2014
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	! -q n !! Huffman coding search !! Use full outer loop for Huffman encoding !! sv_qnt.substep_shaping !! Subblock gain !! Noise-shaping !! Amplification !! Stopping !! Description		! -q n !! Huffman coding search !! Use full outer loop for Huffman encoding !! sv_qnt.substep_shaping !! Subblock gain !! Noise-shaping !! Amplification !! Stopping !! Description
	\|-		\|-
	\| 0 \|\| Best \|\| Yes \|\| 2 \|\| 1 \|\| Yes \|\| 2 \|\| 1 \|\| align="left" \| Use all the best, and slowest, parameters/algorithms that are available.		\| 0 \|\| Best \|\| Yes \|\| 2 \|\| 1 \|\| Yes \|\| 2 \|\| 1 \|\| align="left" \| Use all the "best", and slowest, parameters/algorithms that are available.
	\|-		\|-
	\| 1 \|\| Best \|\| No \|\| 2 \|\| 1 \|\| Yes \|\| 2 \|\| 1 \|\|		\| 1 \|\| Best \|\| No \|\| 2 \|\| 1 \|\| Yes \|\| 2 \|\| 1 \|\|
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	\| 5-6 \|\| Normal \|\| No \|\| ? \|\| 1 \|\| Yes \|\| 0 \|\| 0 \|\|		\| 5-6 \|\| Normal \|\| No \|\| ? \|\| 1 \|\| Yes \|\| 0 \|\| 0 \|\|
	\|-		\|-
	\| 7-8 \|\| Normal \|\| No \|\| ? \|\| -1 \|\| No \|\| 0 \|\| 0 \|\| align="left" \| Same as -f. Very fast, OK quality. Psychoacoustics are used for pre-echo and mid/side stereo, but no noise-shaping is done.		\| 7-8 \|\| Normal \|\| No \|\| ? \|\| -1 \|\| No \|\| 0 \|\| 0 \|\| align="left" \| Same as -f. Very fast, best quality, better keep high frequency. Psychoacoustics are used for pre-echo and mid/side stereo, but no noise-shaping is done.
	\|-		\|-
	\| 9 \|\| Normal \|\| No \|\| ? \|\| -1 \|\| No \|\| 0 \|\| 0 \|\| align="left" \| Disables almost all algorithms including psy-model.		\| 9 \|\| Normal \|\| No \|\| ? \|\| -1 \|\| No \|\| 0 \|\| 0 \|\| align="left" \| Disables almost all algorithms including psy-model.
	\|}		\|}

176.15.222.141: /* Effects */

2014-08-12T00:53:00Z

Effects

← Older revision		Revision as of 00:53, 12 August 2014
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	\| 7-8 \|\| Normal \|\| No \|\| ? \|\| -1 \|\| No \|\| 0 \|\| 0 \|\| align="left" \| Same as -f. Very fast, OK quality. Psychoacoustics are used for pre-echo and mid/side stereo, but no noise-shaping is done.		\| 7-8 \|\| Normal \|\| No \|\| ? \|\| -1 \|\| No \|\| 0 \|\| 0 \|\| align="left" \| Same as -f. Very fast, OK quality. Psychoacoustics are used for pre-echo and mid/side stereo, but no noise-shaping is done.
	\|-		\|-
	\| 9 \|\| Normal \|\| No \|\| ? \|\| -1 \|\| No \|\| 0 \|\| 0 \|\| align="left" \| Disables almost all algorithms including psy-model~~. Poor quality~~.		\| 9 \|\| Normal \|\| No \|\| ? \|\| -1 \|\| No \|\| 0 \|\| 0 \|\| align="left" \| Disables almost all algorithms including psy-model.
	\|}		\|}

18.62.30.0: clarify that these changes went into effect with 3.98 as per lame CVS r1.296

2014-07-07T02:06:47Z

clarify that these changes went into effect with 3.98 as per lame CVS r1.296

← Older revision		Revision as of 02:06, 7 July 2014
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	===VBR===		===VBR===
	VBR encoding modes take some different code paths and ignore some of the listed values. In particular, the ten values of -q are mapped to just 3 values under VBR:		VBR encoding modes take some different code paths and ignore some of the listed values. In particular, the ten values of -q are mapped to just 3 values under VBR as of 3.98 and later:
	* -q7 to -q9 are mapped to -q7. This level uses a psymodel but does not calculate quantisation noise when encoding: it takes a quick guess.		* -q7 to -q9 are mapped to -q7. This level uses a psymodel but does not calculate quantisation noise when encoding: it takes a quick guess.
	* -q5 and -q6 include all features of -q7, calculate and consider actual quantisation noise, and additionally enable subblock gain.		* -q5 and -q6 include all features of -q7, calculate and consider actual quantisation noise, and additionally enable subblock gain.

18.62.30.0: clarify

2014-07-07T02:03:14Z

clarify

← Older revision		Revision as of 02:03, 7 July 2014
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	===VBR===		===VBR===
	VBR encoding modes take some different code paths and ignore some of the listed values. In particular, the ten values of -q are mapped to ~~a smaller number of actual qualities~~ under VBR:		VBR encoding modes take some different code paths and ignore some of the listed values. In particular, the ten values of -q are mapped to just 3 values under VBR:
	* -q7 to -q9 are mapped to -q7. This level uses a psymodel but does not calculate quantisation noise when encoding: it takes a quick guess.		* -q7 to -q9 are mapped to -q7. This level uses a psymodel but does not calculate quantisation noise when encoding: it takes a quick guess.
	* -q5 and -q6 include all features of -q7, calculate and consider actual quantisation noise, and additionally enable subblock gain.		* -q5 and -q6 include all features of -q7, calculate and consider actual quantisation noise, and additionally enable subblock gain.