On the Concatenation of Video Processing within news journalism production
In a genre which focuses on immediacy, the move to high definition with its requisite high datarates and processing loads is proving particularly challenging if picture quality is to be maintained. This paper presents research undertaken alongside BBC Journalism into the encoding, compositing and scaling processes required by the news production workflow and their effects on the high definition picture quality delivered to the home. In this paper the complex processes used within the new production life-cycle are modelled e.g. in-field editing, low datarate contribution circuits, graphics and the transmission of content back to the field for re-purposing. The onwards playout through a broadcaster's transmission systems are also discussed. This paper focuses on the criteria to be considered in making a choice of high definition compression codec for use in a journalism production chain, the requirements for initial acquisition and the problems caused when some elements of the system are pre-determined. Finally we show that, in some circumstances, using a standard definition workflow gives better results. The content of this paper was orginally presented as a poster at IBC 2011.
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