[LarsAlereon]

Based on my experience and some brief research I don't think this is generally accurate. While I'm sure some combinations of encoder and bitrate might be an issue, YouTube is actually delivering rather high quality audio on HD videos. There's nothing inherent to Joint Stereo encoding that would make binaural audio not work, it's the default choices encoders make at low bitrates.

[AphantaZach]

Modern encoders (especially Opus) are indeed impressive at preserving the stereo image at high quality settings. If you are on a stable connection getting the full 192kbps+ stream, the phase error is likely negligible.

The issue is that we can't control the delivery.

Streaming platforms use adaptive bitrate. If a user's bandwidth dips on mobile, the player might switch to a lower tier where the model starts aggressively quantizing the Side channel (L-R) to save space.

Since the binaural effect relies entirely on that Side channel difference, I wanted to remove the variable entirely.

By generating it client-side with the Web Audio API, we get mathematical certainty regardless of the user's connection speed.

[LarsAlereon]

I think if you pitched this as "binaural beats that always work regarding of network conditions" that would be better-received. I don't think there's much of a scenario where streaming services aren't able to consistently deliver high enough quality for 3D positional audio. If there were, ASMR artists would be pushing much harder for alternate platforms.