Re: : r613 - docs/nutissues.txt

On Wed, Feb 13, 2008 at 04:46:09PM +0100, Alban Bedel
wrote:
> I think the pb is that the best interpretation (ie.
absolute in real
> world units or relative) depend on how the sound was
mastered.
> 
> If you take todays movies and albums you probably want
a relative
> interpretation, so that most speakers just get the
unadultered sound.
> 
> On the other hand if someone is doing a recording which
is supposed to
> be heard on a well defined setup, and one want to get
the closest
> possible experience to what was intended, real world
units are needed.
> But I suspect even more is needed for a really good
simulation. The
> echo characteritic of the room, temperature, wind, etc
> 
> So perhaps we should just have relative coordinate for
now, and add a
> note that we are open to add a standard info packet for
"listening
> environement simulation" if ppl from this field
are intersted.

One other idea: what about storing the numerator values
always, and:
- if denominator is 0, the numerators are just relative
values
- if denominator is nonzero, the values are in physical
units (being
  american, i vote for yards! =P)

> > I dont think its too usefull for 2 ch, a default
of (-1,0,0) (1,0,0)
> > would be easy for the muxer to store. And similar
for 1 ch ...
> > But if a muxer has to store 5ch audio, figuring
out the channel
> > placement could be trickier. Iam not saying iam
against it, actually
> > maybe it is the correct thing to do, and having
this optional would
> > just lead to it being missing most of the time
...
> 
> I agree, making it mendatory is the best option. But
them we should
> perhaps define some defaults for typical
configurations.

Yes, that'd be nice. Also it would be nice if the reference
demuxer
could "downgrade" the position information to
standard 'dumb' channel
naming for callers (left, right, front, left-rear,
right-rear,
whatever).

Rich
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On Wed, Feb 13, 2008 at 01:20:52PM -0500, Rich Felker
wrote:
> On Wed, Feb 13, 2008 at 04:46:09PM +0100, Alban Bedel
wrote:
> > I think the pb is that the best interpretation
(ie. absolute in real
> > world units or relative) depend on how the sound
was mastered.
> > 
> > If you take todays movies and albums you probably
want a relative
> > interpretation, so that most speakers just get the
unadultered sound.
> > 
> > On the other hand if someone is doing a recording
which is supposed to
> > be heard on a well defined setup, and one want to
get the closest
> > possible experience to what was intended, real
world units are needed.
> > But I suspect even more is needed for a really
good simulation. The
> > echo characteritic of the room, temperature, wind,
etc
> > 
> > So perhaps we should just have relative coordinate
for now, and add a
> > note that we are open to add a standard info
packet for "listening
> > environement simulation" if ppl from this
field are intersted.
> 
> One other idea: what about storing the numerator values
always, and:
> - if denominator is 0, the numerators are just relative
values

> - if denominator is nonzero, the values are in physical
units (being
>   american, i vote for yards! =P)

no chance!
you can pick from one of these:
mickey, yottaparsec, metric exainch, square root femtobarn,
or if you really insist
light picosecond, zeptoparsec or siriometer

[...]
-- 
Michael     GnuPG fingerprint:
9FF2128B147EF6730BADF133611EC787040B0FAB

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