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Параметры конвертации в mp3остальные параметры дефолтные? И для всех представленных треков одинаковые?
44.1kHz, stereo, 128 kbps или 320 kbps
-q n Internal algorithm quality setting 0..9.
0 = slowest algorithms, but potentially highest quality
9 = faster algorithms, very poor quality
Default is 3.
ATH related:
--noath turns ATH down to a flat noise floor
--athshort ignore GPSYCHO for short blocks, use ATH only
--athonly ignore GPSYCHO completely, use ATH only
--athtype n selects between different ATH types [0-5]
--athlower x lowers ATH by x dB
--athaa-type n ATH auto adjust types 1-3, else no adjustment
--athaa-loudapprox n n=1 total energy or n=2 equal loudness curve
--athaa-sensitivity x activation offset in -/+ dB for ATH auto-adjustment
PSY related:
--short use short blocks when appropriate
--noshort do not use short blocks
--allshort use only short blocks
--cwlimit [freq] compute tonality up to freq (in kHz) default 8.8717
--notemp disable temporal masking effect
--nspsytune experimental PSY tunings by Naoki Shibata
--nssafejoint M/S switching criterion
--nsmsfix M/S switching tuning [effective 0-3.5]
--interch x adjust inter-channel masking ratio
--substep n use pseudo substep noise shaping method types 0-2
--ns-bass x adjust masking for sfbs 0 — 6 (long) 0 — 5 (short)
--ns-alto x adjust masking for sfbs 7 — 13 (long) 6 — 10 (short)
--ns-treble x adjust masking for sfbs 14 — 21 (long) 11 — 12 (short)
--ns-sfb21 x change ns-treble by x dB for sfb21





правда никто почему-то не замечает эффекта,
Разница между mp3 128 kbps, 320 kbps и flac