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Dolby

Dolby Digital Plus
Deliver up to 7.1 Channels
of Stunning Surround Sound

to a Home Theater, Tablet, Laptop, or Smartphone

Encoding.com is Dolby’s preferred partner for the creation of Adaptive Bitrate content that includes Dolby Digital Plus as an audio source

Dolby Digital Plus Benefits

Up to 7.1 Discrete Channels of High-Fidelity Surround Sound. Because Dolby Digital Plus™ (E-AC-3) is an advanced surround sound audio technology designed for evolving media, you get consistent Dolby cinema-style audio across your content.

Premium Mobile Audio Quality. Dolby audio adds depth and power for realistic sound through your headphones and device speakers. You’ll hear clearly, even in loud and busy environments.

The Sound of HDTV. Dolby Digital Plus is based on core Dolby Digital® technologies, the established standard for cinema, broadcast, and home theater surround sound.

Compare Dolby Digital Plus with Stereo Audio

Dolby Digital Plus Consistent Quality on Every Device

Enjoy vibrant, high-quality surround sound from all your favorite content with Dolby Digital Plus. Whether you’re watching movies, TV shows, online videos, or concerts, Dolby Digital Plus ensures that you’ll always get consistent audio quality.

The Technology Dolby Digital Plus is an audio technology based on Dolby Digital 5.1, the established standard for cinema, broadcast, and home theater surround sound.

Compatibility with Current Equipment Equipment with Dolby Digital Plus will unlock its full feature set, including 5.1- and 7.1-channel capability (depending on the program).If your system includes Dolby Digital, you’ll still get 5.1-channel surround sound, with the highest-quality Dolby Digital signal possible. Because Dolby Digital Plus content is easily converted to a traditional Dolby Digital signal, you are assured of the best performance your equipment is capable of.

Dolby Digital Plus Products and Content You can get the Dolby Digital Plus experience by purchasing home theater equipment, such as A/V receivers, Blu-ray™ players, or TVs with Dolby Digital Plus. You can also experience Dolby Digital Plus on a tablet or smartphone by purchasing one with preinstalled software. Check out the Amazon Kindle Fire tablet with Dolby Digital Plus.Look for content encoded with Dolby Digital Plus; you can decode that amazing surround sound experience with Dolby Digital Plus home theater and mobile products.

You can find Dolby Digital Plus encoded content on Blu-ray Disc and from our partners, such as Netflix®, Vudu®, or Amazon Fire™ TV.

How it Works Based on both psychoacoustic and cognitive models of audio perception, Dolby Digital Plus delivers HD-quality audio for streaming, on-demand, and downloaded content by using some of our most advanced algorithms. Dolby Digital Plus makes it possible to store and transmit high-quality digital sound to deliver the best audio quality possible on many different kinds of devices.

Additional Benefits for Mobile Devices When incorporated into a mobile device, Dolby Digital Plus adds post-processing technologies that dramatically improve your device’s audio capabilities and your whole entertainment experience. Devices with Dolby Digital Plus have been specifically tuned so that even built-in speakers deliver natural, louder, distortion-free sound.

  • Download files or streaming videos faster and more reliably.
  • Experience surround sound through your headphones or built-in speakers with the Surround Virtualizer.
  • Hear every word with the Dialogue Enhancer.
  • Keep the volume constant across all content and applications with the Volume Leveler.
  • Connect device directly to a home theater for a full surround sound experience with Dolby Digital pass-through.

Dolby Digital Plus Comparison

wdt_IDnew_columnDolby Digital PlusHE-AAC
1High Quality 5.1 Surround Sound at 192 kbpsxx
2Seamless Bit Rate and Channel Configuration Changex
3High Quality Stereo at 96kbpsxx
4Scalable to Perceptibly Lossless Audiox
5Broad Consumer Device Penetrationx
6Support for MPEG DASH, HLS, Microsoft Smooth and HDSxx
7Supported in International Standardsxx
8Consistent Experience Across Devices With Only One Streamx
9Consistent & Reliable Playback Behaviorx
10Consistent Program Loudness Across all Decodersx
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Encoding.com Support for Dolby Digital Plus

Encoding.com is Dolby’s preferred partner for the transcoding of Adaptive Bitrate content. We’ve created the code snippets for our use with our mature and well documented API. In addition, sample outputs are available below in every major adaptive format with the dynamic audio of Dolby Digital Plus.

HTTP Live-Streaming

<?xml version="1.0" encoding="UTF-8"?>
<query>
<userid></userid>
<userkey></userkey>
<action>AddMedia</action>
<source></source>
<format>
<output>advanced_hls</output>
<stream>
<!-- use DD audio codec for this stream -->
<audio_codec>eac3</audio_codec>
</stream>
<stream>
<!-- use Dolby AAC audio codec for this stream -->
<audio_codec>dolby_aac</audio_codec>
</stream>
<!-- Use DMG segmenter for all streams -->
<segmenter>dolby_segmenter</segmenter>
<pack_files>no</pack_files>
<destination></destination>
</format>
</query>

MPEG-DASH

<?xml version="1.0" encoding="UTF-8"?>
<query>
<userid></userid>
<userkey></userkey>
<action>AddMedia</action>
<source></source>
<format>
<output>mpeg_dash</output>
<!-- use hbbtv Dolby Segmenter profile -->
<dash_profile>hbbtv</dash_profile>
<!-- use DD audio codec for all streams -->
<audio_codec>eac3</audio_codec>
<pack_files>no</pack_files>
<destination></destination>
</format>
</query>

Microsoft Smooth Streaming

<?xml version="1.0" encoding="UTF-8"?>
<query>
<userid></userid>
<userkey></userkey>
<action>AddMedia</action>
<source></source>
<format>
<output>smooth_streaming</output>
<!-- use DD audio codec for all streams -->
<audio_codec>eac3</audio_codec>
<destination></destination>
<!-- Use DMG segmenter -->
<segmenter>dolby_segmenter</segmenter>
<pack_files>no</pack_files>
</format>
</query>

More Sample Outputs

We’ve also included sample outputs for HLS, MSS, and MPEG-DASH, as well as the source MP4 that was used to create them.

Recommended Parameters for Dolby Digital Plus

Broadcast and Online Dolby Digital Plus

wdt_IDEncoding BitrateMonoStereo5.1-Channel7.1-Channel
1Default Bitrate (kbps)64128192384
2Minimum Bitrate (kbps)3296192384
3Maximum Bitrate (kbps)1024102410241024

Example Audio Bitrate for Adaptive Streaming

wdt_IDDimensionsBitrateProfileLevelAudio
1640x360800High496-64kbps
2640x3601200High4192-96Kbps
3950x5401800High4192Kbps
41280x7202500High4192Kbps
51280x7204500High4192Kbps
61920x10806500High4.1384-192Kbps
71920x10808500High4.1384-192Kbps
8Audio Onlylo-audio64kbps (Stereo)
9Audio Onlyhi-audio192kbps (5.1)

Additional Learning

Use Dolby with Encoding.com

Dolby Developer Portal

Closed Captions & Descriptive Audio White Paper

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Encoding.com • Encoding Intelligence™ • Copyright 2016 Encoding.com • All Rights Reserved
  • Cloud Solutions
    • On Demand
    • HybridCloud
    • Reserved Cloud
  • Media Services
    • Features
      • Formats
      • Quality Control
      • Speed
      • Playout Graphics and Editing
      • Interfaces
      • Closed Captioning
      • Cloud Security
    • Packaging
      • HTTP Live Streaming (HLS)
      • Microsoft Smooth Streaming (MSS)
      • HTTP Dynamic Streaming (HDS)
      • Dynamic Adaptive Streaming over HTTP (DASH)
      • Dynamic Ad Insertion (DAI)
    • Digital Rights Management
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      • Dolby Vision
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