Re: [LAU] Gain and clipping wav -> lame

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To: <linux-audio-user@...>
Date: Monday, July 29, 2013 - 4:22 pm

On Mon, 29 Jul 2013 14:15:28 +0000
Fons Adriaensen wrote:

> On Mon, Jul 29, 2013 at 03:27:33PM +0200, Philipp Überbacher wrote:

Really? I can't find any proper references, at least not in the latest
version of the ITU-1770 paper
(http://www.itu.int/rec/R-REC-BS.1770-3-201208-I/en). They only roughly
describe some tests, first as mostly female speech (p. 13-14), later
they claim it was a broad base of material (p. 18). I can't see any
obvious reference to details of those tests, the second referenced
paper (Evaluation of Objective Loudness Meters) seems to describe it,
but it seems this paper is not publicly accessible.

However, my point here is that it has to show its performance and
especially superiority over the established RG1 in practice, everything
else is of little significance.

> > I do find their recommended conversion equation questionable, they

According to the R-128 paper the standard deviation of their samples
from the line they plotted there is 1dB, no idea what it is from the
slope (-1) they guessed there. Still, given to songs it could well be
2dB or more off, but my main point is that this is still with _their_
data set. I guess that with another data set the differences could be
larger and significant to the point where the error is large enough for
the conversion to be a bad thing™.

I wonder whether a better, albeit slightly more complicated way of
conversion can be found, this one was apparently chosen primarily for
its simplicity.

Don't get me wrong, I like ReplayGain, and I'd like to see further
adoption, I'm just not sure the R-128 based one will actually be better
and cause further adoption. I fear it could cause confusion and further
problems instead. Sometimes I also like to argue and see the bad parts
in everything.

On the upside, the temperature just dropped below 30° for a
change.

Have a nice day,
Philipp

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Messages in current thread:
[LAU] Gain and clipping wav -&gt; lame, Martin Cracauer, (Thu Jul 25, 6:21 pm)
Re: [LAU] Gain and clipping wav -&gt; lame, Fons Adriaensen, (Thu Jul 25, 7:40 pm)
Re: [LAU] Gain and clipping wav -&gt; lame, Martin Cracauer, (Thu Jul 25, 8:14 pm)
Re: [LAU] Gain and clipping wav -&gt; lame, Fons Adriaensen, (Thu Jul 25, 9:44 pm)
Re: [LAU] Gain and clipping wav -&gt; lame, Ralf Mardorf, (Fri Jul 26, 4:29 am)
Re: [LAU] Gain and clipping wav -&gt; lame, Will Godfrey, (Thu Jul 25, 9:09 pm)
Re: [LAU] Gain and clipping wav -&gt; lame, Marc , (Thu Jul 25, 8:46 pm)
Re: [LAU] Gain and clipping wav -&gt; lame, Martin Cracauer, (Fri Jul 26, 10:35 pm)
Re: [LAU] Gain and clipping wav -&gt; lame, Marc , (Sun Jul 28, 4:45 am)
Re: [LAU] Gain and clipping wav -&gt; lame, Fons Adriaensen, (Sun Jul 28, 11:27 am)
Re: [LAU] Gain and clipping wav -&gt; lame, Jörn Nettingsmeier, (Sun Jul 28, 12:44 pm)
Re: [LAU] Gain and clipping wav -&gt; lame, Ralf Mardorf, (Sun Jul 28, 1:21 pm)
Re: [LAU] Gain and clipping wav -&gt; lame, Jörn Nettingsmeier, (Mon Jul 29, 1:29 am)
Re: [LAU] Gain and clipping wav -&gt; lame, Ralf Mardorf, (Mon Jul 29, 6:00 am)
Re: [LAU] Gain and clipping wav -&gt; lame, Marc , (Sun Jul 28, 2:21 pm)
Re: [LAU] Gain and clipping wav -&gt; lame, Edgar Aichinger, (Sun Jul 28, 12:00 pm)
Re: [LAU] Gain and clipping wav -&gt; lame, Ralf Mardorf, (Sun Jul 28, 12:21 pm)
Re: [LAU] Gain and clipping wav -&gt; lame, Ralf Mardorf, (Sun Jul 28, 11:47 am)
Re: [LAU] Gain and clipping wav -&gt; lame, Fons Adriaensen, (Sat Jul 27, 9:18 am)
Re: [LAU] Gain and clipping wav -&gt; lame, Martin Cracauer, (Mon Jul 29, 6:13 pm)
Re: [LAU] Gain and clipping wav -&gt; lame, Fons Adriaensen, (Mon Jul 29, 7:56 pm)
Re: [LAU] Gain and clipping wav -&gt; lame, Marc , (Sun Jul 28, 11:50 pm)
Re: [LAU] Gain and clipping wav -&gt; lame, Fons Adriaensen, (Mon Jul 29, 9:25 am)
Re: [LAU] Gain and clipping wav -&gt; lame, Philipp , (Mon Jul 29, 9:45 am)
Re: [LAU] Gain and clipping wav -&gt; lame, Fons Adriaensen, (Mon Jul 29, 10:13 am)
Re: [LAU] Gain and clipping wav -&gt; lame, Philipp , (Mon Jul 29, 1:27 pm)
Re: [LAU] Gain and clipping wav -&gt; lame, Fons Adriaensen, (Mon Jul 29, 2:15 pm)
Re: [LAU] Gain and clipping wav -> lame, Philipp , (Mon Jul 29, 4:22 pm)
Re: [LAU] Gain and clipping wav -&gt; lame, Jörn Nettingsmeier, (Mon Jul 29, 1:27 am)
Re: [LAU] Gain and clipping wav -&gt; lame, Philipp , (Sat Jul 27, 7:10 am)