Meyda feature extracted dat is different in command line and through nodejs

Question

I tried to extract feature of an audio file using Meyda. But feature exytracted values are different when extracted using command line meyda and through javascript file

1. Command line

   meyda 1600153162.63571.wav mfcc

Result

0.057628476337413304,0.025103534166687494,-0.0033402018588145435,-0.0050914619032203364,-0.005969043107840086,-0.009452339628697326,-0.0077781823184730455,-0.0024033016732702066,-0.0033368248853514206,-0.0012372591871309979,0.00003587458387239886,0.00293735474906295,0.0033156231532707036 1.4306079393227265,1.3713938566968262,1.2306487569743767,1.0515807610571597,0.8414768385049735,0.6060415036630535,0.37326507523088365,0.1654296077929904,-0.015392187854876595,-0.1652509593657213,-0.27571446879975764,-0.340564139593766,-0.36505384389267703 9.282664122642018,6.880236029290547,3.3870794551074606,1.7170683624244123,-0.29657914336587826,-3.18544774959499,-4.433789386396694,-3.7101490665746217,-2.816738558429225,-2.2736417577176273,-1.6636438686466657,-0.8537746809738949,-0.5116463089021152 25.65632094501052,22.93621824737729,16.08611763344924,7.490656903754756,-0.4358888007314062,-5.641656791337735,-7.229285832273481,-5.635856022395436,-2.1681330598896817,1.5575050036371694,4.29638119563214 9,5.45750656573637,5.059966218569768 23.469876801827922,20.984500104582974,15.80549272827184,10.064116650359527,3.957435073588796,-1.75506262168123,-5.904087102697238,-8.29320895086182,-9.037630914839253,-8.230609293960022,-6.604159793447832,-4.8505887091085365,-3.2390627275186175 29.14206006610766,25.50517483703385,19.279159148659456,13.806566615476791,7.715092034538,2.2364700767576764,-0.8129542016331001,-2.16772108652068,-2.6257181917727093,-2.1347711722007845,-1.0689231846996041,-0.6059541306434987,-0.9955650805848651 12.251538716256618,9.479093353756676,5.26726325506769,2.7893618666871762,0.10288164291841367,-3.121859159330943,-4.446188894370852,-3.5959072906303837,-2.5699522942015007,-1.8300687753240275,-0.7140618177046422,0.3644613187160053,0.8353185065087604 18.42772721964866,15.990459244575096,11.993313228734504,9.088259023158539,6.172351883886699,2.6632784721745213,-0.2683186290158647,-1.948275236251193,-2.793271841187546,-3.305172382572076,-3.6707865100252994,-3.638999985131 219,-2.863263822827715 15.915610973257571,13.737073178518493,9.801934620786648,5.779403187264773,1.358952752885622,-2.5086411759816647,-5.187471901991046,-7.0034704192058985,-7.837140523422115,-7.437282553994893,-6.058991955183858,-4.360246975428363,-2.680629805396066 15.75090683856979,13.497089898444463,9.489154494388005,5.578283842168272,1.4567586737610156,-2.141429668615224,-4.380728646793593,-5.364310654901947,-5.049848052960211,-4.214979808517224,-3.9745754014376224,-4.076571890925421,-4.020714303609834 23.361729244701564,20.83103985201436,16.592090051349242,12.885538444506535,8.373777248668826,2.9768227085972145,-1.399644048138661,-4.090450595665753,-5.574775136428788,-5.787457864519816,-4.693018758118676,-3.100993535744204,-1.5625546377399475 12.793707716744393,10.197116076581045,5.819041457288568,2.4679725003955064,-0.33041998215142393,-2.607817847380143,-4.086120143731154,-4.779218992884254,-4.374465394096245,-3.118504640745296,-1.9666020102081847,-1.5140789377241373,-1.513064 7010950313 3.2732387410942465,2.2453286293698977,0.9749483649128511,0.472715919767034,0.11249067642678866,-0.19927487640318992,-0.24286230087509772,-0.3645480814147444,-0.5060378572115204,-0.4793996411313405,-0.45934442588699886,-0.4680761055711004,-0.2967506177492105

2. Through javscript file

    var express = require('express'); var app = express(); const fs = require('fs'); var Meyda = require('meyda'); var load = require('audio-loader') let filename = "1600153162.63571.wav" load(filename).then(function (buffer) { const channelData = buffer.getChannelData(0) const PaddingLength = (Math.pow(2,Math.round(Math.log2(channelData.length)+1)) - channelData.length) let halfPaddingLength = parseInt(PaddingLength/2) const pad1 = new Array(halfPaddingLength).fill(0); const pad2 = new Array(PaddingLength - halfPaddingLength).fill(0); let finalBbuffer = [...pad1,...channelData,...pad2] console.log(finalBbuffer.length) let mfccData = Meyda.extract('mfcc', finalBbuffer) console.log("mfccData : ",mfccData); });

Result :

[ 249.11783051490784, -90.61751411189829, -12.253094024524968, 19.88245460444982, -11.661965456271869, -14.795375019626466, 7.19298966815922, 8.362884489124907, 3.9941283332736557, -3.2158388656478287, -2.0395393071161063, -0.48849176751482837, -3.6199623273626695 ]

Why this difference . How to make them same ?

Answer 1

They're different because you're padding the buffer in your code, whereas the command line tool is splitting your file into multiple buffers with the default buffer size and returning MFCCs for each segment.

To make them the same, you could replicate the buffer chunking that the CLI performs in your code, rather than zero-padding the whole buffer, or you could make a CLI that zero pads the input. If you do the latter, we would certainly be interested in adding that functionality to the bundled CLI, so feel free to open an issue on our issue tracker to discuss if you go that route and wish to contribute.

Thanks for using Meyda!