SMPTE 2011: Take a Unique Material Identifier, Please
HOLLYWOOD: UMIDs take metadata to a whole new level. UMID
stands for “Unique Material Identifier,” a core component in MXF and AAF. UMIDs
are also part of a SMPTE spec and intended for linking audio/video material to
metadata. Such deployments are rare, according to Yoshiaki Shibata of MetaFrontier,
yet material is more easily trackable via UMIDs than metadata alone.
“Suppose you want to retrieve AV material which captures ‘Ichiro Homerun’
scene,” he said, referring to the Seattle Mariners right fielder. The metadata,
which describes the file, indicates it is a UMID-numbered clip, so the media
asset management system searches for the UMID.
However, Shibata said, the industry now lacks a common UMID resolution
protocol. He recommended clarifying two principles: UMID integrity and UMID
identification. The first would assure the “unique” part of a UMID for
individual clips. The second assures that the UMID identifies the “essence
representation of the material,” he said.
Using a IMID Managed Domain embodies both of these principles and would provide
content identification across a workflow, Shibata said. All workflow elements
can identify and track files, from acquisition through ingest, cataloguing,
editing, playout server, archiving, etc. UMIDs can be much more useful, he
said, under appropriate common rules for its applications.