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14 lines
1.1 KiB
Markdown
14 lines
1.1 KiB
Markdown
Implements a command line utility that allows to detect the TRUE quality of your audio material in one batch. Uses psychoacoustics as defined and scientifically proven in:
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- ISO/IEC 11172-3:1993 - Coding of moving pictures and associated audio for
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digital storage media at up to about 1.5 Mbit/s, Part 3: Audio (MPEG-1
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Audio Layer III, "MP3").
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- ISO/IEC 13818-7:2006 - Generic coding of moving pictures and associated
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audio information, Part 7: Advanced Audio Coding (AAC).
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- Zwicker, E. & Fastl, H. - *Psychoacoustics: Facts and Models*, Springer,
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1999 (Fletcher–Munson equal-loudness contours).
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- Lerch, A. - *An Introduction to Audio Content Analysis*, Wiley, 2012
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(spectral features for audio forensics).
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Always implement only what is scientifically provable. As it is possible to view on a spectrum analysis of the audio to see the hard cutoff introduced by compression algorithms as MP3, it is possible to tell if we have a 96k MP3 file that just was re-encoded as 320k, for example, or a 128k as 320k, or a 320k as FLAC, and so on. This tool should allow to spot exactly those re-encoded / transcoded files.
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