Transcoding system using encoding history information

Abstract

The present invention provides a transcoder for changing a GOP structure and the bit rate of an encoded bitstream obtained as a result of an encoding process based on MPEG standards. According to the transcoder provided by the present invention, encoding parameters generated in a past encoding process can be transmitted to the MPEG encoder which performs a present encoding process as a history information. And optimum encoding parameters in commensurate with the present encoding process are selected from the transmitted encoding parameters, and the selected encoding parameters are reused in the present encoding process. As a result, the picture quality does not deteriorate even if decoding and encoding processes are carried out repeatedly.

Description

This patent application is a divisional application of the following patent application: Application number: 200410088170.6 Application date: March 10, 1999 Title of Invention: Code Conversion System Using Code History Information technical field The present invention relates to a transcoding system, a video encoding device, a data stream processing system, and a system for changing the GOP (Group of Pictures) structure and the bit rate of an encoded bit stream obtained as a result of encoding processing based on the MPEG (Moving Picture Experts Group) standard Video decoding device. Background technique In recent years, broadcasting stations for producing and broadcasting television programs are generally using MPEG technology for compressing and encoding video data. In particular, MPEG technology is becoming a de-facto standard for recording video data on magnetic tapes or random access recording media and for transmitting video data via cables or satellites. The...

AI Technical Summary

Problems solved by technology

Therefore, decoding and encoding processes result in image quality degradation

Thus, there is a problem that image quality deterioration occurs every time encoding and decoding processing is performed

In other words, the effect of image quality deterioration is accumulated each time the decoding and encoding processes are repeated

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