Loading Audio in Node JS

• web-codecs

  14 904 8.3 HTML

  WebCodecs is a flexible web API for encoding and decoding audio and video.

  

While in theory it might be possible to run ffmpeg through emscripten and run it in a web worker (I certainly assume someone has done this), it's not necessarily practical to try and use the same technique from node to transcode audio on the web. The good news is that the w3c has chartered a working group to focus on web codecs. While this is at the time of writing still in early stages, the working group is powering ahead on designing and proposing an API to enable media transcoding on the web, and hopefully that will become available to us in the near future.

• meyda

  7 1,391 5.2 TypeScript

  Audio feature extraction for JavaScript.

  

If you're using Meyda to analyze audio that you load in this way, you will need to make sure that the sample rate of the audio matches the sample rate that Meyda is set to use. Otherwise you'll end up with audio features that are incorrect, and based on a skewed frequency scale. You can either match the Meyda sample rate to the wav sample rate, or you can resample the audio to fit a standard sample rate (i.e. 44,100hz, or 48,000hz). Resampling audio is a complicated topic beyond the scope of this article, but if you have trouble finding information online, let me know and I may find time to write an article.

• WorkOS

  workos.com sponsored

  The modern identity platform for B2B SaaS. The APIs are flexible and easy-to-use, supporting authentication, user identity, and complex enterprise features like SSO and SCIM provisioning.

  

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