An architecture and performance model for multi-user digital video editing systems

摘要

Digital video editing, due to the several advantages enjoyed over its traditional analog counterpart, is being used by an increasing number of post-production personnel in the film/TV industry. Digital video editing is primarily done either on raw uncompressed video, or on video that has been compressed using only intra-frame compression schemes. We describe a video editing system architecture where editing may be done directly on the frames in the digital disk recorder (DDR), and playback from the DDR may be viewed at the user's workstation. User workstations are networked to the common DDR using a high-bandwidth network. A tape library is used as the off-line storage medium. Multiple users could edit and preview the video clips off the DDR right at their workstations and at the same time. Since disk resources are being shared by several users, the Quality of Service (QoS) that each user receives needs to be investigated. We develop a queueing model that investigates the average waiting time of different user requests. Numerical results are provided and their use in admission control is illustrated.