The OTT sound revolution has begun... Dolby's 'AC-4' codec, which delivers Blu-ray-quality audio, makes its debut

Dolby’s AC-4 audio codec is showing near-lossless quality at lower bitrates than DD+JOC in listening tests.

Peacock is set to be the first OTT service to adopt AC-4 at CES 2026, with Amazon Music and Tidal already using it.

The codec could deliver high-quality immersive audio under tight streaming bandwidth limits, reshaping competition in OTT audio.