2014-08-05 16:49 GMT+02:00 Fons Adriaensen <fons@xxxxxxxxxxxxxx>:
My 0.02€: I would suggest to add a cli option for output filename, leaving 'ebur128-prob' as default if none is specified
* 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.
On Tue, Aug 05, 2014 at 04:23:23PM +0200, Raffaele Morelli wrote:Yes, the entire audio file is processed. Internally ebumeter and ebur128
> Ok, works but I have a couple of question.
>
> I see only 751 records in the outfile. How ebur128 works? Is the file
> scanned entirely and how?
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
the histogram integrated and normalised to 1. In other words
the probability that the level is less than the X-axis value.
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,
--
FA
Great tool, I finally leaved it untouched as cumulative probability it's enough for the scope*.
My 0.02€: 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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