--r3mix はあいかわらず --vbr-old 向けなんだなぁ。 --remix から /** * please, do *not* DOCUMENT this one * it is a developers only switch (rh) */ っていうのが外れておおっぴらに使えるようになるのはいつになるんだろう?
>Excellent news ! >The fast vbr-mtrh mode by Mark Taylor and Robert Hegemann (also main designer of vbr-old) >is, after a very long development cycle, tuned for high frequent quality. > This means it'll give a VBR performance boost up to 248% ( 2.5x faster ) and yield virtually the same quality. ・・・・・・
--scale <arg> scale input (multiply PCM data) by <arg> --ath-adjust n ATH auto adjust types 1-3, else no adjustment --adapt-thres-type n n=1 total energy or n=2 approximated loudness --adapt-thres-level x ?? --cwlimit <freq> compute tonality up to freq (in kHz) default 8.8717 --ns-sfb21 x change ns-treble by x dB for sfb21 -X n selects between different noise measurements -Y lets LAME ignore noise in sfb21, like in CBR -Z toggles the scalefac feature on/off
Now the -X parameter selects between different approaches to make this decision:
-X0 the actual is better if it has less distorted scalefactor bands, or if it's equal to the best so far and the sum of noise over the thresholds is less than the best so far
-X1 the actual is better if the maximum noise over all scalefactor bands is less than the best so far
-X2 the actual is better if the total sum of noise is lower than the best so far
-X3 the actual is better if the total sum of noise is lower than the best so far and the maximum noise over all scalefactor bands is less than the best so far plus 2db.
-X4 this is a bit complicated, I think Greg Maxwell should explain this ;)
-X5 the actual is better if the sum of noise over the thresholds is less than the best so far or if they are equal and the total sum of noise is lower than the best so far
-X6 the actual is better if the sum of noise over the thresholds is less than the best so far or if they are equal and if the maximum noise over all scalefactor bands is less than the best so far or if they are equal and the total sum of noise is less or equal the best so far
All these are EXPERIMENTAL and may disappear sooner or later. Maybe we find the one and only criterion someday.
>>274 *NOTE* No psy-model is perfect, so there can often be distortion which is audible even though the psy-model claims it is not! Thus using a small minimum bitrate can result in some aggressive compression and audible distortion even with -V 0. Thus using -V 0 does not sound better than a fixed 256 kbps encoding. For example: suppose in the 1 kHz frequency band the psy-model claims 20 dB of distortion will not be detectable by the human ear, so LAME VBR-0 will compress that frequency band as much as possible and introduce at most 20 dB of distortion. Using a fixed 256 kbps framesize, LAME could end up introducing only 2 dB of distortion. If the psy-model was correct, they will both sound the same. If the psy-model was wrong, the VBR-0 result can sound worse.
>>334 --nspsytune uses Naoki Shibata's advanced psycho accoustic model enhancements. Improves many things:
1. Method to calculate tonality 2. Method to calculate ATH 3. Use -X0 and 'careful noise shaping' when encoding in CBR mode 4. Method to switch between long and short block 5. Allocates more bits to short block in which attack exists 6. Method to calculate masking in mid-side stereo 7. Method to switch between midside stereo and regular stereo frames 8. Better bitreservoir handling
Allows lower bitrates and is overall more efficient and quality yielding than the default LAME gpsycho. Fixes problems on most of the hardest tracks and solved all JS problems I know.
--athtype
slightly adapted ATHtype compared to 3.89 and 3.88. principles
>>460 LAME 3.91 December 29 2001 Darin Morrison: Bugfix for --alt-preset (for content with low volume, clean vocals), only important for the "fast standard" preset
Alexander Leidinger: add some missing files to the distribution add --alt-preset to the man page
The ?insane?-option gives you the current theoretical maximum quality possible with LAME MP3 encoder, or with any other MP3 encoder. The output files are flat 320kbps. Using this may be a little insane, since the difference in quality in between ?extreme? and ?insane? is minimal. However, if you simply don?t care about file size, want maximum quality, or you have hardware that can?t handle VBR files, then you could use this option.
>--alt-presets are no longer just "presets" as in a collection of switches, >instead they are now quality "modes" because of special code level tunings >(those mentioned above) コードレベルでのチューニングがなされてるらしい。.
海の向こうでも同じ事で煽りあっています。 alt preset extreme -m s ?? >just wanted to make sure this command line was ok. no conflict or anything? >I assume i could use -m s with preset standard as well?
>thanks, >juglesh
>This was asked before many times, mostly by people who have been >'brainwashed' by some audio ripping community that joint stereo is a bad >thing and simple stereo is always better. 後略 tangent
>no, i havent been brainwashed, but i have washed my ears lately, have you?
>This was asked before many times, mostly by people who have been >'brainwashed' by some audio ripping community that joint stereo is a bad >thing and simple stereo is always better. 後略 tangent
当分nspsytune2が--alt-presetに使われることはないらしい。 Dibrom >For starters, nspsytune2 isn't practical to use in a "recommended" >build because it requires 2 passes and an external program to be used, >not to mention that even according to Naoki it's still very early and needs more tuning.
>I think it will be a ways off before nspsytune2 is ready for "production" use so I wouldn't >expect to see it in the alt-presets in the very near future. ttp://www.hydrogenaudio.org/forums/showthread.php?s=f595feb6643f5393e4128ccd23f825bf&threadid=551&pagenumber=3