Hop size and weird result in WebAudio about meyda

[Oortone]

Addition: As noted, with hopSize set to the same as bufferSize I get more sensible figures. However when starting (activating WebAudio) I do get a few first readings that look similar to the ones where hopSize is set to a separate value. At least I see that with spectralRolloff. Glitches at startup? So maybe glitches with differntiated hopSize in a simmilar way but constantly?

I also recorded the Audio Input on a DAW to assure there's nothing wrong with the soundcard and it isn't. The 250hz tone is clear without glitches. The WebAudio throughput does not have glitches either.

I have now also tried on a PC Laptop using Chrome with the same result.

[Oortone]

Here's the script online. A little bit of junk remaining but nothing that should affect WebAudio:
https://www.sigvardson.se/public/audioclassification_test/meydaminimum.html

Open in Chrome (I only tested in Chrome/Edge) Javascript console to see reading of spectralRolloff when feeding 250 hz. In this one I set sampling frequency to 44100 hz.

Also tried using latest version, but I see no difference. Still jumping values:

<script type="text/javascript" src="https://unpkg.com/meyda/dist/web/meyda.min.js"></script>

[Oortone]

Yet an addition. After experimenting with various ways (Meyda, Essentia, WebAudio) to create short term amplitude spectrum at 48 kHz sampling frequency and 2048 buffer size I'm pretty sure there's an issue with the deprecated ScriptProcessorNode. I get the same weird glitches in Chrome in both Meyda and Essentia using this node but it seems I get a clean signal using the WebAudio built in AnalyserNode. Although of course at the cost of practically no other feature extraction than STFT-spectrogram available.

It might be that I can get better result with other buffers or sampling frequency but that's of no use for my current project and it also seems very unreliable since indeed ScriptProcessorNode is deprecated.

[hughrawlinson]

Thanks for reporting this @Oortone. I'll look into it as soon as I can.