> From: "Gabriel Bouvigne" <[EMAIL PROTECTED]>
>
> In mp3enc, there's a quality setting (-q x)
>
> What about turning -h to such a quality setting like -h x, with x varying
> from 1 to 9, 9 beeing the highest quality, like in mp3enc. Calling -h
alone
> would use the maximum available quality, so it would remain backward
> compatible.
>
> I thinked about it because the new full Huffman search is fine, but quite
> slower than before and it seems to be a problem for some users.
Sounds like a good idea to me. But what options at what settings? Presumably
we want the settings with the best quality/speed tradeoff to be added at
lower settings, with more expensive and/or less effective changes as -q
increases. But some options have benefits that depend on other settings -
for exmple, full huffman search might make a big difference at 32kbps, but I
doubt it's really noticable at 256kbps. Things like the more accurate MDCT
quantization should give benefits at all bitrates.
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. -qual 8
and above enables full huffman search, but at the bitrates I typically use
(192 or 224kbps) that's (again) probably not very significant.
-- Mat.
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