AC-4 Professional Partner FAQ

Why Dolby AC-4?
Dolby AC-4 is a powerful new audio emission format that meets the needs of next generation content delivery with improved compression efficiency. Read more ...
Mon, Nov 6, 2017 at 1:47 PM
What are the main advantages of Dolby AC-4 from a broadcast systems perspective?
Audio/Video Frame Alignment In current digital broadcast systems, encoded audio and video utilize different frame rates. Although in isolation these rat...
Mon, Nov 27, 2017 at 4:53 PM
What are the use-cases for Dolby AC-4 from a professional perspective?
The primary application for Dolby AC-4 is delivery of next generation audio to the home through traditional broadcast and on-line streaming channels.
Mon, Nov 6, 2017 at 2:16 PM
In which transports would I expect to see Dolby AC-4?
Dolby AC-4 has been standardized for most container formats used today: Like Dolby Digital and Dolby Digital Plus, Dolby AC-4 can be carried over AES3...
Mon, Nov 6, 2017 at 1:52 PM
Is Dolby AC-4 more efficient than Dolby Digital or Dolby Digital Plus?
Dolby AC-4 delivers 5.1 surround sound at 96kbps. This means it is up to two times more efficient than Dolby Digital Plus and up to four times more efficien...
Mon, Nov 6, 2017 at 1:53 PM
Where can I get more information about muxing of Dolby AC-4 in MPEG-2 transport streams?
DVB has standardized Dolby AC-4 to be carried in MPEG-2 transport streams. The important documents to read are as follows: Specification for the use ...
Mon, Nov 6, 2017 at 1:54 PM
Is Dolby AC-4 more complex to encode than Dolby Digital or Dolby Digital Plus?
Because Dolby AC-4 can support a new range of complex use-cases, the encoding process can be more computationally expense. However, when comparing similar us...
Mon, Nov 6, 2017 at 1:55 PM
How is a Dolby AC-4 stream different from a Dolby Digital or Dolby Digital Plus stream?
The high level structure of Dolby bitstreams has evolved since Dolby Digital was introduced. Dolby Digital bitstreams are independent and self-contained pro...
Thu, Nov 30, 2017 at 7:59 AM
Is metadata different for Dolby AC-4?
Dolby AC-4 has inheirited the basic principles of Metadata as established in Dolby Digital and Dolby Digital Plus. Important Metadata is carried along with ...
Thu, Oct 12, 2017 at 12:26 PM
How can I detect the presence of Dolby AC-4 on a physical carrier or within a transport stream?
The descriptors for detecting Dolby AC-4 in and MPEG-2 transport stream are defined in Specification for Service Information (SI) in DVB systems,ETSI EN 300...
Mon, Nov 6, 2017 at 2:23 PM