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Topic: what is scalefac? [encspot] (Read 4198 times) previous topic - next topic
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what is scalefac? [encspot]

i been using encspot for 2 weeks now. its great.. but what is scalefac? the lower the percent the better?


what about max. reservoir? the lower the number the bettter?

what is scalefac? [encspot]

Reply #1 –
Quote
Originally posted by jamie
i been using encspot for 2 weeks now. its great.. but what is scalefac? the lower the percent the better?
It seems to show how much scalefactor scaling has been used in noise shaping process. When scalefactor scaling is used, then the allocation of quantization noise is more dynamic: http://www.hydrogenaudio.org/forums/showth...t=2604#post5608
In princible, the more it's used, the higher encoding efficiency there is. It's not without problems though. Alt-preset vbr modes takes this issue into account.
Quote
what about max. reservoir? the lower the number the bettter?
If I remember correctly this shows the maximum bit reservour. With vbr coding it's usually low. You really cannot say if higher or lower number is better... It's just information.
Juha Laaksonheimo

what is scalefac? [encspot]

Reply #2 –
ok, scale factor... the higher the percentage the better it is

"In princible, the more it's used, the higher encoding efficiency there is. It's not without problems though. Alt-preset vbr modes takes this issue into account."


as for max. reservoir...

"If I remember correctly this shows the maximum bit reservour. With vbr coding it's usually low. You really cannot say if higher or lower number is better... It's just information."

i understand, thank you

what is scalefac? [encspot]

Reply #3 –
Quote
Originally posted by jamie
ok, scale factor... the higher the percentage the better it is
Well, it depends. The higher the percentage, the higher the efficiency is, but there's a greater chance for quality glitches in some special situations.

From pure quality point of view it could be better if the percentage is lower with vbr coding, and higher with low bitrate cbr. But the situation is not so simple and straightforward. It can well be that with certain vbr setting the percentage is higher and quality is better.
I would advice not to worry or make any conclusions about the quality based on it either.
Juha Laaksonheimo

what is scalefac? [encspot]

Reply #4 –
thank you for helping me understand, JohnV