hello,
On Mon, Sep 09, 2002 at 01:37:11PM +0300, Vincent Kargatis wrote:
[..]
> At the moment I'm using 'alt-preset 144[or 160] -b96' as a compromise to
> retain a smaller filesize. With that goal in mind, are there any better
> encoding option choices?
if i understand the documentation (lame --alt-preset help) right, in
this case lame is working in ABR mode. it also says that abr is not nearly as
flexible as vbr. (see last point)
> [..] Does
> the 'standard' methodology allow resolution scaling like that, or does it
> use heuristics that don't scale like that? Just curious - I'm ignorant
> about the innards.
afaik "standard" invokes some high-quality settings (vbr with -q=2
(good algorithm, takes more time), vbr-quality high (-V=2), mininum bitrate
128 and some other settings that are more special and i don't really know
about them).
however you can override settings, i use
--alt-preset standard -V 4 -b 112
for quite some stuff, bitrate is of course lower than just "standard",
quality good enough for my issues.
question to all experts: is this useful or would it make more sense
to invoke lame just with --alt-preset standard -V 4 -b 112 -q=2 ?
> One aspect I'm wondering about with my current choice is that it doesn't
> seem to take a 'global' look at the file: say the middle section is very
> quiet and sparse, the 'alt-preset NNN' doesn't seem to decide it could use
> the unneeded space from there on the busier parts elsewhere - it just varies
> the resolution on a very whort time scale. (Heck, I don't even know if
> 'standard' does that, but I was assuming it did.)
i think this is the difference between vbr and abr (which i think you
are using in this case, see first point). afaik abr tries to maintain
the specified bitrate all over the file, vbr tries maintain the specified
quality. vbr possibly spends high bitrates for some parts and low on other
(works fine for silence, which is encoded at 32kbps). however filesize of
vbr isn't (that well) predictible.
i'm no expert on encoding at all, so forgive me if i am wrong about the
abr vs. vbr points, expert's comments welcome.
regards
wernfried
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