From Hydrogenaudio Knowledgebase
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Internal Variables
| -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 |
Use slowest & best possible version of all algorithms.
|
| 1 |
best |
0 |
2 |
1 |
1 |
2 |
1 |
|
| 2 |
best |
0 |
2 |
1 |
1 |
1 |
1 |
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 |
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 |
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 |
Disables almost all algorithms including psy-model. Poor quality.
|
VBR
| -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.
