TRANSCODER, TRANSCODING METHOD, DECODER, AND DECODING METHOD

摘要

The invention provides a transcoder and a transcoding method capable of quickly transcoding video data of different compressive encoding schemes without increasing the circuit scale. A transcoder including a decoder (1), a syntax conversion section (2), and an encoder (3) is used. The decoder (1) decodes video data compressively encoded in accordance with the MPEG-2 scheme, extracts motion vectors produced in accordance with the MPEG-2 scheme, and performs dequantization on the video data other the motion vectors. The syntax conversion section (2) converts the syntax of the video data obtained from the decoder (1) to the H.264 scheme. The encoder (3) quantizes the video data obtained as a result of syntax conversion and compressively encodes it along with the extracted motion vectors in accordance with the H.264 scheme. The encoder (3) adds a descriptor indicating that the motion vectors have been produced in accordance with the MPEG-2 scheme to the obtained data.