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Dolby AC-4 and HTTP Live Streaming
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HTTP Live Streaming and Dolby AC-4 overview
Introduction about HLS and Dolby AC-4
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Introduction to Dolby AC-4 and HTTP Live Streaming specification
This information set specifies the required data formatting and signaling between the server (sender) and the clients (receivers) to enable Dolby AC-4 to be used as an audio format within HTTP Live Streaming A/V delivery applications in conjunction with packed audio or ISO base media file format.
Dolby AC-4 packetization into a fragmented MP4 file
The process of analyzing and preparing a Dolby AC-4 bitstream for storage within a fragmented MP4 file is described. AC-4 sync frames must be converted to raw AC-4 frames before packetization.
Dolby AC-4 packetization into HTTP Live Streaming compliant audio-only elementary stream segments
When multiplexing a Dolby AC-4 audio elementary stream into HTTP Live Streaming compliant audio-only elementary stream segments, the product must meet certain conditions.
HTTP Live Streaming playlist files with Dolby AC-4
Requirements and recommendations for a playlist that lists entries for a presentation that includes Dolby AC-4 content are described.
Demultiplexing Dolby AC-4 bitstreams from an ISO base media file segment
Buffering must be considered when product designers implement an ISO base media file format file demultiplexer that supports Dolby AC-4 bitstreams.
HTTP Live Streaming and Dolby AC-4 overview
Introduction about HLS and Dolby AC-4
HTTP Live Streaming
HLS is a protocol developed by Apple for transferring unbounded streams of multimedia data. HLS works by breaking the content into a sequence of small HTTP-based file segments, each of which can be downloaded independently. Alternative segments at different data rates are available, allowing streaming to adapt to different network conditions.
Raw AC-4 frame
Each raw AC-4 frame is composed of a table of contents and at least one substream.
Random access point
The Dolby AC-4 decoder features a seamless switch between Dolby AC-4 elementary streams of the same media content and different configuration options.
Sync frames
A Dolby AC-4 bitstream in the AC-4 sync frame transport format (as specified in ETSI TS 103 190) consists of Dolby AC-4 synchronization frames. The AC-4 sync frame transport format must be used for MPEG packed audio.
Glossary
Notices
HTTP Live Streaming and
Dolby AC-4
overview
Introduction about
HLS
and
Dolby AC-4
HTTP Live Streaming
HLS
is a protocol developed by Apple for transferring unbounded streams of multimedia data.
HLS
works by breaking the content into a sequence of small HTTP-based file segments, each of which can be downloaded independently. Alternative segments at different data rates are available, allowing streaming to adapt to different network conditions.
Raw AC-4 frame
Each raw AC-4 frame is composed of a table of contents and at least one substream.
Random access point
The
Dolby AC-4
decoder features a seamless switch between
Dolby AC-4
elementary streams of the same media content and different configuration options.
Sync frames
A
Dolby AC-4
bitstream in the
AC-4
sync frame transport format (as specified in
ETSI TS 103 190
) consists of
Dolby AC-4
synchronization frames. The
AC-4
sync frame transport format must be used for
MPEG
packed audio.