Garage Cinema is doing research about Mobile Media Metadata. From their Internet site:
Our research is about making video a data type that humans and computers can create, access, process, reuse, and share according to descriptions of its semantic content and the principles of its syntactic construction. Our research aims to make this process as effortless as possible. Prof. Davis discussed the outlines of this agenda in an invited article for the 50th Anniversary Issue of the Communications of the ACM (Davis 1997).