Access point pictures designated as randomly accessible positions are I pictures or P pictures. The automatic feeding mechanism includes: the feed tray on which a predetermined number of recording medium can be placed; a hopper for pushing the recording media on the feed tray toward a feed roller; and a separator located in a downstream of the hopper near the hopper. In the method according to the present invention, the fraction of compound material is large enough to eliminate or significantly reduce the hysteresis behavior of the reactive sputtering process and enable a stable deposition of compound films at a rate significantly higher than what is possible from a target completely made from compound material.