emfcamp-stream-volume.js

/*

If like me you find the EMFCamp stream audio to be too quiet to hear,

FIRST TURN YOUR VOLUME TO ZERO. NOT MUTE. ZERO.

Then run this snippet, and slowly turn the volume back up to a comfortable level.

WARNING: If you don't turn your volume to ZERO and slowly turn up to a comfortable level,
you risk damaging your speakers, your hearing, and the hearing of those in earshot.

It's possible that the broadcast audio level will come up. In that case just refresh the
page, which will remove this javascript.

The EMFCamp stream is here: https://streaming.media.ccc.de/emf2022/stagea/hls

*/

const ctx = new AudioContext();
const videoNode = new MediaElementAudioSourceNode(ctx, {mediaElement: document.querySelector('video')});
const gainNode = new GainNode(ctx);
videoNode.connect(gainNode);
gainNode.connect(ctx.destination);
gainNode.gain.value = 8;