The Challenges of Mobile Media

Today’s consumers are seeking no-compromise on-the-go audio and video comparable in quality to what they’re accustomed to from home entertainment systems and Internet content portals. Delivering this experience requires balancing a number of competing factors—bandwidth requirements, delivery speeds, and handset capabilities. Dolby® Media Generator helps provide this balance, offering a unique and efficient way to give consumers high-quality audio and video that will meet and even exceed their expectations.

Faster and More Reliable

With Dolby Media Generator, aggregators and distributors ensure more reliable delivery of mobile content while lowering storage requirements, reducing download times, and raising playback quality.

One of the ways Dolby Media Generator accomplishes this is by making files more efficient without diminishing their quality. Dolby engineers helped revolutionize the cinema and home theater experience, and that same know-how informs the world-class encoding tools in Dolby Media Generator.

In addition to streamlining files for greater efficiency, Dolby Media Generator automatically validates and, if necessary, repairs files. This minimizes the need for quality control and ensures a better, more consistent playback experience.

The Metadata Difference

Dolby Media Generator also improves file formatting. Instead of aggregators and distributors having to create multiple variants from the master to ensure playback on different mobile devices, Dolby Media Generator produces a single standards-based file compatible with almost any mobile device.

Embedded within this file is metadata—a benefit to content creators, operators, and consumers alike. In fact, Dolby Media Generator adds five metadata sections to all processed files, sections that range from business information for better tracking and reporting to liner notes, album art, and other information that will increase consumer engagement. Metadata can even be used to control the settings on devices featuring Dolby Mobile.

Dolby Media Generator Features

Dolby Media Generator includes the following suite of processing tools:

Dolby Pulse encoder—updated AAC, HE AAC, and HE AAC v.2 encoder

Dolby Digital Plus encoder—multichannel encoding to maximize the benefits of next-generation mobile devices

H.264 video encoding—complementary video encoding to offer high-quality video images at low data rates

Loudness control and limiting—ability to maximize the audio levels to suit playback on a portable device

Automatic validation and repair of source media—optimizes quality control

Extensive yet flexible command-line options for simple integration into work flows and existing server infrastructure

Standards-based MPEG 4 outputs

Operating Systems

Windows® (32-bit): Windows XP, Windows Vista®, Windows Server® 2003

Linux®/Unix® (32-bit): Fedora, Ubuntu, Debian

Dolby Media Generator Output

File containers: MP4, M4A, 3GP, DoCoMo Mobile MP4

Output Stream

AAC per ISO/IEC 13818-7:2003 and ETSI 3GPP TS 26.234, Release 4

HE AAC per ETSI 3GPP TS 26.234, Release 6

HE AAC v.2 per ISO/IEC 14496-3 and ETSI 3GPP TS 26.234, Release 6

WAV

Dolby Pulse

Video Streams

H.263 baseline and H.263 Profile 3 level 45 per ITU-T Recommendation

H.263 and ETSI 3GPP TS 26.234, Release 4

MPEG-4 Visual Advanced Simple Profile per ISO/IEC 14496-2

AVC/H.264 per ISO/IEC 14496-10/ITU-T Recommendation H.264

Metadata Within File Container

XML metadata sections in UUID boxes

ID32 box containing ID3v2 tag

Apple® iTunes® metadata boxes

Channel Configuration Options

One-Channel Configuration

Mono-to-stereo conversion

Two-Channel Configuration

Stereo upmixing

Stereo upmixing and Dolby Pro Logic® II encoding

Dual-mono detection

Matrix detection

Multichannel Configuration

Upmixing to 5.1

Downmixing to Pro Logic II

Phase detection

Loudness Processing

Analysis and adjustment of dialnorm

Adjustable input gain

Fully flexible limiter

Dolby Media Generator Analysis and Metadata

Average loudness

Dialogue ratio

Channel content

Two-channel mono content

Sound imaging width perception

Frequency content

Graphic EQ 

Mobile Surround 

Validation and Repair

Audio

Missing audio

Detection and repair of DC offset

Detection and repair of phase differences between Left and Right channels

Repair of incorrect channel count

Encoder bit rate and/or version incompatible with Pro Logic II

Video

Missing video

Other Command-Line Tools

dmg-meta for injecting metadata with no analysis or processing

dmg-extract for extracting metadata from Dolby Media Generator encoded media

dmg-playback for processing and playback emulation of Dolby Mobile

dmg-profile for creating handset encoding profiles from WURFL database

dmg-ccpack for backward compatibility with HE AAC encoder tools

Note: Dolby Media Generator does not include Dolby Pulse or Dolby Digital Plus decoders. These can be found on select consumer devices. Contact us for further information and updates on performance.

Choose from the drop-down menus below to get Dolby professional reference material.

Select a Technology-- Analog Recording --Dolby A-type NRDolby B-type NRDolby C-type NRDolby S-type NRDolby Spectral Recording (SR)-- Cinema --Dolby DigitalDolby Digital Surround EXDolby Spectral Recording (SR) for CinemaDolby StereoDolby Surround 7.1-- Encoding/Decoding --Dolby AC-2Dolby Digital (AC-3) Encoding/DecodingDolby Digital EXDolby Digital LiveDolby Digital PlusDolby EDolby Open Specification for 3D SystemsDolby PulseDolby TrueHDDolby Volume (Broadcast)Dolby Volume (STB/TV)MLP Lossless-- Games --Dolby Axon-- Matrix --Dolby Pro LogicDolby Pro Logic IIDolby Pro Logic IIxDolby Surround-- On The Go --Dolby Mobile-- Virtual --Dolby HeadphoneDolby Virtual Speaker

Select a Product-- Cinema --Dolby Digital CinemaCat. No. 702Cat. No. 735CP750DMA8PlusDolby ScreenTalkDolby Show Library (DSL100)NA10Theatre Management System Software-- Broadcast & Pro Audio --Dolby Media ProducerDM100DP563DP564DP569DP570DP571DP572DP579DP583DP600LM100MS10 Multistream Decoder430 Series585737740Cat. No. 541-- Live Sound --Dolby Lake Processor