I built this out of frustration: streaming analog audio to Google Cast speaker groups (~5s latency)

I built this out of frustration.

I wanted to play analog audio (turntable, cassette, CD) on my Google Home speaker groups — but there’s no good solution for this.

So I built my own solution.

Setup:

• Analog source
• USB audio interface (e.g. Scarlett)
• Android app
• Local streaming pipeline → FFmpeg → HLS → Google Cast speaker groups

How it works:
Analog input → PCM → (DSP: bass/treble) → AAC → HLS (1s segments) → local HTTP server → Cast

Result:

• Stable latency: ~4–6 seconds
• Works with Google Home / Nest speaker groups
• Fully local (no cloud)

Main issue I hit:
Direct audio streaming caused ~30+ seconds delay on Cast.

Switching to HLS reduced this to ~5 seconds consistently.

I’m wondering:

1. Is this worth turning into a product?
2. Or does this make more sense as a licensable SDK for audio companies?

Curious how you would approach this.