Because of its advanced features, it’s a good idea to make Dolby Digital Plus the preferred audio format on platforms and devices that support it.
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Also called EC3 or E-AC-3, Dolby Digital Plus produces clear and powerful sound for a remarkably versatile set of outputs, from stereo headphones and speakers to 7.1 surround sound systems.īoth Dolby Digital Plus and Dolby Digital are supported natively across iOS, macOS, and tvOS, as well as Microsoft’s Windows 10 platform. It is supported in HLS for compatibility with systems that don’t support native Dolby playback.ĭolby Digital, also known as AC-3, is an advanced, metadata-rich audio format that can deliver up to six channels of audio at data rates between 384 and 640 Kbps.ĭolby Digital Plus, evolved from Dolby Digital, is a more capable audio format that brings higher audio quality, lower data rates, more powerful metadata-driven features and support for 7.1 audio channels. Let's start with a brief discussion of audio formats.ĪAC is a widely deployed audio codec in online video, often used as a baseline stereo audio codec.
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But you can read up on these materials in this post on the Dolby Developer blog, which also provides full access to the various master playlists you’ll learn to create, as well as the actual HLS video clips they enable, and the presentations you'll see in these videos.įor more information HLS encoding in general, check out Apple's HLS Authoring Specification on the Apple Developer site. There’s a lot of detail in all presentations and they move pretty fast.
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In the third tutorial, you’ll learn how to segment your streams and create media playlist files with Apple’s Media File Segmenter, and how to create the master playlist file that tells the playback client what audio formats and variants are available, including how to support multiple languages.įinally, you will learn how to validate your streams with Apple’s Media Stream Validator tool.
In the second tutorial, you’ll learn how to measure audio loudness and how to encode files in Dolby Digital Plus, Dolby Digital, and AAC formats to support all devices and audio end points. In the first tutorial, we’ll provide an overview of the workflow and show examples of the tools you’ll need to get the job done. Over the course of this three-part tutorial series, we’ll show you how to do just that. Since the release of iOS 10, tvOS 10, and MacOS Sierra, you can now deliver Dolby Audio via HLS and play it back on any audio endpoint, including device speakers, headphones, or external sound systems via AirPlay or HDMI. This video tutorial series is sponsored by Dolby.ĭolby Audio is a family of premium sound format(s) that provides enhanced clarity, easy-to-hear dialogue, consistent volume, and also surround sound when played on a 5.1 or 7.1 channel system.
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