PROCESS AND APPARATUS FOR CONVERTING AN MPEG-2 BITSTREAM INTO AN SMPTE-259 COMPATIBLE BITSTREAM

摘要

A process and apparatus for converting an MPEG-2 bistream into an SMPTE-259compatible bitstream are characterized by a framerate converter which is selectively ambled to drop every 1001st frame of theincoming MPEG-2 bitstream depending on the input bitstreamframe rate. If the input bitstream frame rate is other than 29.97 or 59.94 Hz,a frame dropper is enabled to discard every 1001st frame. Thepresent converter can convert many different types of input bitstreams, suchas all I types, IPIP types, or complex GOP types containing I,P, and B frames. The enabled frame dropper will drop either the I or P frameif it occurs as the 1001st frame, but if the 1001st frame is ofthe B frame type, the pixel information of the B frame is dropped. Thisproduces a minimum in loss of information during the conversion.The format converter allows existing SMPTE-259 routing equipment to route andutilize MPEG-2 bitstreams, such as HDTV applications.