Various arrangements for testing video decoder device functionality are presented. The input and output cog assemblies include a plurality of varying diameter input and output cogs, respectively, arranged sequentially. A rotation angle of the input shaft and a position of the planetary gear are detected on the basis of voltage signals output from the first resolver, and a steering angle of the steering wheel is obtained on the basis of the detected rotation angle and the detected position. The fingerprint sensor reads a user’s fingerprint and then scanned fingerprint data and reference fingerprint data stored in the electronic key are transferred to the terminal system for comparison. The interactive media player may exhibit media and allow interaction between users andor users and administrators. An effective macroblock identification unit then identifies macroblocks each of which can be contained in a moving object as an effective macroblock by using one or more encoding parameters extracted by the coded stream analyzer.