Анализа аудиопотока

Группа метрик анализирующих аудиопоток.

EBU R128

Метрика EBU R128 Стандарта Европейского вещательного союза (EBU) специальным документом определяющая несколько параметров громкости, включая кратковременную, интегрированную и кратковременную громкость.

R 128 refers to a European Broadcasting Union (EBU) specification document governing several loudness parameters, including momentary, integrated, and short-term loudness.

QuaCheck specifically examines momentary loudness, or sudden changes in volume over brief intervals of time (up to 400ms). This can be helpful in identifying areas where volume may exceed upper loudness tolerance levels as perceived by an audience.

This metrics takes an audio stream and analyzes its loudness level. By default, it logs a message at a frequency of 10Hz with the Momentary loudness (identified by M), Short-term loudness (S), Integrated loudness (I) and Loudness Range (LRA).

The metrics accepts the following options:

I (Integrated loudness)

Общая громкость, измеряемая в единицах абсолютного значения громкости (Loudness units relative to full scale, LUFS). Общая громкость вычисляется на основании анализа звуковых частот и уровня сигнала, применимое к чувствительности человеческого слуха к ним.

LRA (Loudness Range)

Диапазон громкости измеряемый в единицах громкости (Loudness units, LU). Разница между самым громким и самым тихим звуками.

Scale meter

Set the EBU scale meter. Common values are 9 and 18, respectively for EBU scale meter +9 and EBU scale meter +18. Any other integer value between this range is allowed.

Info

Default value is 9.

RMS

RMS_Level

RMS level dB

For selected audio tracks this graph plots the Standard peak and RMS level measured in dBFS and the Peak and trough values for RMS level measured over a short window. Note that this value is plotted per audio frame and not per audio sample.

Phase

Provides a metric to represent the mean phase of each audio frames. Value is in range [-1, 1]. The -1 means left and right channels are completely out of phase and 1 means channels are in phase.