Auxiliary Image Sequences in IMF

摘要

This paper describes an auxiliary image sequence plug-in that enhances SMPTE ST 2067, SMPTE TSP 2121 suit of documents to enable compositing workflows through the use of the Interoperable Master Format (IMF). — The component-based nature of IMF allows multiple versions of a programme to be created, managed and distributed more efficiently. However, it is currently limited to a single concurrent video track in any composition; a restriction which limits certain use cases that could otherwise realise the benefit of IMF's full capabilities. — Our primary use case for the auxiliary image sequence is the management of sign-interpreted programming. This currently necessitates the creation of a new full-length master for each version created. Instead it is proposed that the video of the sign interpreter will be stored as a separate component. This will allow the implementer to be composited with the main programme when required. — A working prototype of a simple compositing processes has been developed by the DPP in partnership with its member companies. Opportunities for more complex and dynamic compositing via Output Profile List (OPL) and time-variant metadata are also discussed in the paper, along with other use-cases for the functionality described. — The plug-in described in this paper will provide benefit to the implementer throughout the IMF lifecycle by enabling storage, editing, re-positioning and processing of the auxiliary image sequence before compositing.