GlossaryDolby Atmos

Dolby Atmos

Dolby Atmos is an immersive audio format that places sounds in three-dimensional space, including overhead, rather than in fixed speaker channels. In streaming video, Dolby Atmos is usually delivered inside an E-AC-3 (Dolby Digital Plus) audio track, and sometimes in Dolby AC-4. Compatible TVs, soundbars and headphones then render the sound for each listener's setup.

Why it matters

Dolby Atmos is a premium feature that viewers with home theaters and good headphones look for on top films and live events. It adds production and delivery work, so services usually reserve it for titles where immersive sound helps win and keep subscribers.

How it works

  1. Sound mixers place sounds as objects with positions in 3D space, plus a base channel mix.
  2. The mix is encoded, for streaming usually inside an E-AC-3 track.
  3. The playback device reads the object positions and the layout of the speakers in the room.
  4. It renders the sound for the speakers or headphones present, from soundbars to full home theaters.

Do I need special speakers for Dolby Atmos?

No, you do not need special speakers, but the effect is strongest with Atmos-capable systems. Atmos adapts to the setup, from full home theaters with ceiling speakers to soundbars and headphones using virtual surround. Without a compatible device, viewers hear standard surround or stereo instead.

Dolby Atmos vs 5.1 surround: what is the difference?

Traditional 5.1 surround sends sound to fixed channels, while Dolby Atmos places sounds as objects in 3D space, including overhead. The playback device then decides how to render those objects for its speakers. That makes Atmos more flexible and immersive, especially with height speakers.

Where it's used

OTT services and premium sports streamers offer Dolby Atmos on top films, series and live games for viewers with home theaters, soundbars or headphones.

By the numbers

  • The first Dolby Atmos installation was at the El Capitan Theatre in Los Angeles for the premiere of Brave in June 2012. (Wikipedia: Dolby Atmos)
  • Dolby Atmos allows storage and distribution of 128 audio tracks; in cinemas, 118 of these are available for objects. (Wikipedia: Dolby Atmos)

Making Video Dead Easy For Developers

We've put together valuable insights in the form of blogs and guides. Check'em out.

What a microdrama platform costs to run: about 30 cents a viewer, and falling

What a microdrama platform costs to run: about 30 cents a viewer, and falling

Explore the true cost of building a microdrama platform. Understand streaming, encoding, storage, infrastructure costs, and how unit economics improve as your audience grows.

Your content is a channel. Castr limits how much of it you can broadcast.

Your content is a channel. Castr limits how much of it you can broadcast.

Compare FastPix and Castr for cloud playout. See differences in channel limits, scheduling, API access, EPG support, analytics, automation, and pricing for 24/7 streaming.

AI content moderation using NSFW and Profanity filter

AI content moderation using NSFW and Profanity filter

Discover how AI is changing content moderation with advanced NSFW and profanity filters. This blog highlights how AI boosts efficiency, accuracy, and cost-effectiveness, making online spaces safer and more respectful. Learn about the technology behind these filters and their impact on user experience.