There are a number of undocumented procedures and parameters underpinning the computation of MFCC vectors by
- the size and form of the filter bank,
- the liftering and pre-emphasis formulae applied and their parameters,
- the form and parameters of the Fourier transformations used,
- the nature of the normalization of the audio data, etc.
I'm offering a bounty to reproduce the MFCC vectors by
AudioLocalMeasurements using Mathematica primitives (
PeriodogramArray, etc.) so that one can understand and make use of the MFCC output.