Hi,

Is there anything currently being used in conjunction with -q0. I thought I read something somewhere about a newer noise shaping routine put on either -q1 or -q0. I want to experiment with -q0, but don't want any extra crap messing with the results. Also, does adding -Z to a commandline without -nspsytune still active the regular noise shaping routine? Just double checking. This question is in regards to version 3.91.

thanks,
mp3fan

Yes, -q0 activates new experimental and very slow noise shaping. It's different than pre-3.90 -q0. I once tested it with high bitrate nspsytune and it wasn't good. Could be better at low bitrate cbr gpsycho though, but it's experimental..

If you use -Z without nspsytune it will use "noise shaping type 2" which means there will be more use of scalefac_scale than without -Z (noise shaping type 1).
http://www.hydrogenaudio.org/forums/showth...d=5608#post5608

I think using "noise shaping type 2" with GPSYCHO is not such a good idea.. and it leads to problems also with nspsytune with clips like fatboy. Since nspsytune uses "noise shaping type 2" by default, using -Z will make it switch to "noise shaping type 1" which can improve especially fatboy etc. type of signals.

Yes, there is a new noise shaping routine in use from Takehiro (I think it starts at -q0 but I haven't looked at the source in awhile).

However, -q0 is not designed to raise quality at all over noise shaping 2 or 1. Instead, it's designed to save even more bits than noise shaping 2, which means it will also allow for even more error. This, and its 40-400% slower, often only saving 2-5kbps. I've experimented with it some, but I just can't see how it's advantagous given those circumstances.



-Z toggles noise shaping 1 or 2 depending on what it is currently set to.

With nspsytune, noise shaping 2 is on, so -Z turns it to 1
Without nspsytune noise shaping 1 is, on so -Z turns it to 2

However, the new noise shaping mode actually enables noise shaping 2 and then builds upon that, making it even more aggressive, if I remember correctly.

It's also worth noting, for those that may not know, that with nspsytune and type 2, if my adaptive techniques are used (--alt-preset), then there are no longer issues on clips like fatboy. Without these specific tunings though, you are correct.