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Dolby Media Generator: HD Content on the Go

Mobile users demand no-compromise on-the-go video and audio comparable in quality to what they’re accustomed to from home entertainment systems and high-end 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 video and audio that will meet and even exceed their expectations.

Faster and More Reliable

Dolby Media Generator brings aggregators and distributors reliable delivery of mobile content while lowering storage requirements, reducing download times, and boosting playback quality.

These improvements are achieved by increasing the efficiencies of the content without diminishing its quality. Dolby engineers helped revolutionize the cinema and home theater experience, and that same know-how is utilized in the world-class encoding tools of 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 and more consistent playback experience.

The Metadata Difference

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 ranging from business information for better reporting to liner notes, album art, and other information that will increase consumer engagement. Metadata can even be used to control the settings and playback experience on devices.

Dolby Media Generator Features

Dolby Media Generator includes the following suite of processing tools:

Dolby Pulse encoder—updated AAC, HE AAC, and HE AAC v2 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 or 64-bit): Windows XP, Windows Vista®, Windows Server® 2003, Windows 7

Linux®/Unix® (32-bit or 64-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


Dolby Pulse

Dolby Digital Plus (ATSC A/52B Annex E, ETSI TS 102 366)

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

3GP Asset Data

Conversion between metadata formats

Timed text track support for lyrics or subtitles

File Handling

Batch processing—process all media files in a folder

Audio pass-through

Video pass-through

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

Stereo downmix to mono

Multichannel Configuration

Upmixing to 5.1

Downmixing to Pro Logic II

Surround channel 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


Detects missing audio

Detection and repair of DC offset

Detection and repair of phase differences between Left and Right channels

Detection of incorrect channel count

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

Detection of audio with low bass content

Detection of low-bandwidth audio


Detects missing video

Resizing of video frame

Cropping and padding of video frame

Automatic pixel aspect ratio correction

Frame rate conversion

Control over brightness, contrast, and RGB balance

Multipass H.264 encoding with three rate-control algorithms

Baseline, main, extended high H.264 profiles supported

Adds watermark to encoded 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

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.