Video Metadata Hub

The IPTC Video Metadata Hub (VMD Hub) is a recommendation comprising widely used properties. They can be used for describing the visible and audible content and for rights data, administrative details and technical characteristics of a video. All the properties can be expressed by two technical standards in a seamless way and many of them by additional four standards. This number may increase.

The benefits of the Video Metadata Hub are

• A single set of video metadata properties covering many use cases
• This single set of video metadata properties can be expressed by multiple technical standards
• Support of workflows with videos across different standards
• Support of searching across videos of different standards

 

Overview

... how Video Metadata Hub properties interact with existing video standards.

Use case: metadata is edited by a system independent from metadata formats and then embedded into files of different formats.

 

Technical Implementations and Mappings

All Video Metadata Hub properties can be expressed by these technical standards:

• EBU Core - recommended for metadata in stand-alone documents associated with the video binary
• XMP - recommended for metadata embedded into the binary video file

Many of the VMD Hub properties are mapped to these technical standards:

• Apple Quicktime
• MPEG 7 (ISO 15938-5)
• NewsML-G2 (IPTC)
• PB Core
• Schema.org

 

Hub Action

The IPTC Video Metadata is named as hub as it supports the exchange of metadata across standards.

Use case: retrieve metadata from an input video file, normalize it to VMD Hub properties and then write it into video files of different formats.

Step 1: read metadata embedded into a video file

The metadata has to be read by a processor supporting the file's standard, in the example below the Apple Quicktime format. Then the retrieved property values are mapped by the IPTC VMD Hub rules to corresponding VMD Hub properties.

Step 2: embed metadata into files of a different format

First in this step the format of the target files needs to be know, then by the mapping of the VMD Hub property values are transferred to the target format and the format-specific processor writes/embeds the metadata into the file.

 

Status

IPTC has published the Video Metadata Hub Recommendation version 1.0 on 24 October 2016.