Patent ID: 7269304
Filing Date: 2007-09-11
Classification: H04N

Abstract:
1. A transcoder system for adaptively reducing frame rate capable of changing audio-visual stream of a GOP (group of pictures), each picture consisting of a plurality of macroblocks, the transcoder system comprising: a switching device, which inputs the audio-visual stream and permits passing a part of pictures in accordance with a first algorithm; a variable length decoder connected to the switching device, which retrieves motion vector for each macroblock in the pictures; a motion vector compensation device, which computes output motion vectors respectively for the macroblocks in accordance with an input picture type; a memory connected to the motion vector compensation device, which stores the output motion vectors computed by the motion vector compensation device; and an encoder/decoder (codec) connected to the switching device, which decodes the pictures passing through the switching device using motion vector technique and then re-codes the pictures decoded in accordance with the output motion vectors computed by the motion vector compensation device.