Re: [LAU] dynamic range analysis tool

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To: linux-audio-user <linux-audio-user@...>
Date: Friday, August 8, 2014 - 6:47 am

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2014-08-05 16:49 GMT+02:00 Fons Adriaensen :

> On Tue, Aug 05, 2014 at 04:23:23PM +0200, Raffaele Morelli wrote:

=E2=80=8BGreat tool, I finally leaved it untouched as cumulative probabilit=
y it's
enough for the scope*.

My 0.02=E2=82=AC: I would suggest to add a cli option for output filename, =
leaving
'ebur128-prob' as default if none is specified

ciao
/r

* In the beginning of CD era it was common (I guess) to have album released
as they were on CD, lately we see more an more re-master editions of the
same material (plus something else that never made the original recording).
My curiosity is to "investigate" on the dynamic range of both releases.

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=
2014-08-05 16:49 GMT+02:00 Fons Adriaensen <fons@linuxaudio.org><=
/span>:
On Tue, A=
ug 05, 2014 at 04:23:23PM +0200, Raffaele Morelli wrote:

> Ok, works but I have a couple of question.

br>

Yes, the entire audio file is processed. Internally ebumeter and ebur=
128
compute two histograms, each consisting of 751 bins from -70 to +5 dB in
steps of 0.1 dB.

The first histogram is the 'momentary' loudness, the average over
a sliding window of 400 ms. The second is the 'short-term' loudness=
,
computed using a sliding window of 3 seconds.

The histograms are then used to compute average loudness and
loudness range according to the EBU-R128 standard. Ebumeter
will show them in real-time.

For the details, see my LAC 2011 paper which you can find here:
<http://kokkinizita.linuxaudio.org/papers/index.html>.

The output file of ebur128 consists of five columns:

1. X-axis, level in dB
2. Cumulative probability of the momentary loudness, this is
=C2=A0 =C2=A0the histogram integrated and normalised to 1. In other words
=C2=A0 =C2=A0the probability that the level is less than the X-axis value.<=
br>
3. Same for the short-term loudness.
4. The momentary loudness histogram, counts for each bin.
5. Same for the short-term loudnes.

The gnuplot commands I posted will plot 1 vs 4 or 1 vs 5.

Ciao,

--
F=E2=80=8BA
=E2=80=8BGreat tool, I finally leaved it untouched as cumulative probabilit=
y it's enough for the scope*.My 0.02=E2=82=AC: I would suggest to add a cli option for output file=
name, leaving 'ebur128-prob' as default if none is specified

ciao/r
* In the beginning of CD era it was common (I guess) to have album rele=
ased as they were on CD, lately we see more an more re-master editions of t=
he same material (plus something else that never made the original recordin=
g).
My curiosity is to "investigate" on the dynamic range of both rel=
eases.

--001a11c3712e23b0ea050018921a--

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Messages in current thread:
[LAU] dynamic range analysis tool, Raffaele Morelli, (Tue Aug 5, 12:38 pm)
Re: [LAU] dynamic range analysis tool, Robin Gareus, (Tue Aug 5, 3:39 pm)
Re: [LAU] [Bulk] dynamic range analysis tool, Ralf Mardorf, (Tue Aug 5, 1:16 pm)
Re: [LAU] [Bulk] dynamic range analysis tool, Raffaele Morelli, (Tue Aug 5, 1:27 pm)
Re: [LAU] [Bulk] dynamic range analysis tool, Ralf Mardorf, (Tue Aug 5, 1:30 pm)
Re: [LAU] [Bulk] dynamic range analysis tool, Ralf Mardorf, (Tue Aug 5, 1:24 pm)
Re: [LAU] dynamic range analysis tool, Fons Adriaensen, (Tue Aug 5, 1:13 pm)
Re: [LAU] dynamic range analysis tool, Raffaele Morelli, (Tue Aug 5, 2:23 pm)
Re: [LAU] dynamic range analysis tool, Fons Adriaensen, (Tue Aug 5, 2:50 pm)
Re: [LAU] dynamic range analysis tool, Raffaele Morelli, (Fri Aug 8, 6:47 am)
Re: [LAU] dynamic range analysis tool, Fons Adriaensen, (Fri Aug 8, 5:42 pm)
Re: [LAU] dynamic range analysis tool, Raffaele Morelli, (Tue Aug 19, 7:59 am)
Re: [LAU] [Bulk] Re: dynamic range analysis tool, Ralf Mardorf, (Fri Aug 8, 7:15 am)
Re: [LAU] dynamic range analysis tool, Raffaele Morelli, (Tue Aug 5, 1:33 pm)