> From: Mathew Hendry [mailto:[EMAIL PROTECTED]]
>
> BTW, does anyone have any idea what extra things MP3Enc does
> at its higher
> quality settings? Speed drops about five fold going from
> -qual 6 to -qual 7.
> The only quality setting listed in the docs that I would
> think could cause
> such a huge speed decrease is "many outer loops", but I've
> never found a
> perceptible quality decrease in dropping from -qual 7 to
> -qual 6.
Maybe I'm on completely the wrong track here, but could they be recomputing
masking thresholds after each quantization?
Reasoning being that each quantization, by adding noise, also alters the
masking thresholds. For example, if quantization attenuates a particular
band, the thresholds in other bands might be significantly reduced.
Or is this recalculation normally done anyway? AFAIK in LAME, only a few
outer loops are performed, with most of the work being done comparing
different quantizations in the inner loop (with the same psy data each
time).
-- Mat.
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