Hydrogenaudio Knowledgebase - User contributions [en]

Talk:LAME -q switch

2013-06-03T17:09:59Z

Makaki:

=Suggested Documentation=

==Makaki's==

Looking at both the official docs. The USAGE file and detail usage html document. I suggest they both be updated to contain the same description, which could be the following. I will edit this section in-place as new information becomes available.

<pre>
-q 0: Use best and slowest of all algorithms/parameters available.
-q 2: Same as -h. Higher quality than default. Lower values of -q may not produce significantly higher quality.
-q 3: Default value. Good speed, good quality.
-q 5-6: Very fast, average quality. Uses faster huffman encoding (noise shaping)
-q 7-9: Same as -f. Fastest, lowest quality. Psycho acoustics are used for pre-echo & M/S, but no noise shaping is done.

For the default VBR mode since LAME 3.98, -q 0 thru 4 are mapped to -q 0, and is the default.
</pre>

--[[User:Makaki|Makaki]] 19:06, 3 June 2013 (CEST)

Talk:LAME -q switch

2013-06-03T17:06:31Z

Makaki: Created page with "= Suggested Documentation = ==Makaki's== Looking at both the official docs. The USAGE file and detail usage html document. I suggest they both be updated to contain the same de..."

= Suggested Documentation =

==Makaki's==

Looking at both the official docs. The USAGE file and detail usage html document. I suggest they both be updated to contain the same description, which could be the following. I will edit this section in-place as new information becomes available.

-q 0: Use best and slowest of all algorithms/parameters available.
-q 2: Same as -h. Higher quality than default. Lower values of -q may not produce significantly higher quality.
-q 3: Default value. Good speed, good quality.
-q 5-6: Very fast, average quality. Uses faster huffman encoding (noise shaping)
-q 7-9: Same as -f. Fastest, lowest quality. Psycho acoustics are used for pre-echo & M/S, but no noise shaping is done.

For the default VBR mode since LAME 3.98, -q 0 thru 4 are mapped to -q 0, and is the default.

--[[User:Makaki|Makaki]] 19:06, 3 June 2013 (CEST)

LAME Q Switch

2013-06-03T15:41:16Z

Makaki: moved LAME Q Switch to LAME q Switch: the quality switch is lowercase.

#REDIRECT [[LAME q Switch]]

LAME -q switch

2013-06-03T15:41:16Z

Makaki: moved LAME Q Switch to LAME q Switch: the quality switch is lowercase.

=Internal Variables=

{| border=1 class="wikitable" style="text-align:center"
! -q n !! huffman search !! full_outer_loop !! sv_qnt.substep_shaping !! subblock gain !! noise shaping !! amplification !! stopping !! description
|-
| 0 || best || 1 || 2 || 1 || 1 || 2 || 1 || align="left" | Use slowest & best possible version of all algorithms.
|-
| 1 || best || 0 || 2 || 1 || 1 || 2 || 1 ||
|-
| 2 || best || 0 || 2 || 1 || 1 || 1 || 1 || align="left" | Recommended. Same as -h. -q 0 and -q 1 are slow and may not produce significantly higher quality.
|-
| 3 || best || 0 || ? || 1 || 1 || 1 || 1 || align="left" | Default value. Good speed, good quality.
|-
| 4 || best || 0 || ? || 1 || 1 || 0 || 0 ||
|-
| 5-6 || normal || 0 || ? || 1 || 1 || 0 || 0 ||
|-
| 7-8 || normal || 0 || ? || -1 || 0 || 0 || 0 || align="left" | Same as -f. Very fast, ok quality. (psycho acoustics are used for pre-echo & M/S, but no noise shaping is done.
|-
| 9 || normal || 0 || ? || -1 || 0 || 0 || 0 || align="left" | Disables almost all algorithms including psy-model. Poor quality.
|}

= VBR =

{| border=1 class="wikitable"
! -q n !! description
|-
| 0-4 || Default value. Use the best algorithm.
|-
| 5-6 || Use the not so good algorithm
|-
| 7-9 ||
|}

=Observations=
* -q 5-6 Output Same Results. LAME header will indicate the different quality parameter. But the files are otherwise a perfect match.
* -q 7-8 Is always mapped to -q 7 and thus outputs identical files, including the LAME header.
* -q 9 Output is same as -q 7. But official doc describes it as a different quality. LAME header will be different for CBR/ABR and identical for VBR.

LAME -q switch

2013-06-03T13:56:10Z

Makaki:

LAME -q switch

2013-06-03T12:42:07Z

Makaki: work in progress

=VBR=

{| border=1 class="wikitable" style="text-align:center"
! -q n !! huffman search !! sv_qnt.substep_shaping !! subblock gain !! noise shaping !! amplification !! stopping
|-
| 0
|-
| 1
|-
| 2
|-
| 3
|-
| 4
|-
| 5
|-
| 6
|-
| 7
|-
| 8
|-
| 9
|}

=CBR / ABR=