System and method for statistical multiplexing of video coded streams

Abstract

The invention discloses a statistical multiplexing system and a statistical multiplexing method for video coding code streams. The system comprises a preprocessing module group, a statistical strategy control module, a coding module group and a multiplexing module, wherein the preprocessing module group comprises N preprocessing modules, each program corresponds to one preprocessing module, each preprocessing module calculates SAD of video images of each program, and original data of each program is transmitted to the coding module group; the statistical strategy control module distributes a target bitrate to each program according to the SAD of all of the programs and the latest actual bitrate of each program; the coding module group comprises N coding modules, each program corresponds to one coding module, and each coding module carries out coding on each program according to the target bitrates distributed by the statistical strategy control module; and the multiplexing module multiplexes the data streams, which are generated by the coding modules, of all of the programs into a TS (transport stream), monitors the actual bitrate of each program, and transmits the actual bitrate of each program to the statistical strategy control module. According to the system and the method disclosed by the invention, the bitrate required by programs in the future can be estimated more accurately, thereby improving the efficiency of statistical multiplexing.

Description

technical field [0001] The invention relates to the technical field of digital video compression, in particular to a statistical multiplexing system and method for video coded streams. Background technique [0002] After the video is encoded, it is usually packaged together with the corresponding audio encoding stream and auxiliary data to form a complete program. In broadcasting, it is often necessary to transmit multiple programs at the same time in a channel with a fixed data transmission rate, for which multiple programs need to be packaged into a data stream. The system part of MPEG-2 defines a data stream containing multiple programs, called 'transport stream (TS)'. TS is a data stream format widely used at present. The process of packaging the encoded data streams and auxiliary data of multiple programs into a TS is called 'mux', and the process of parsing one or more programs from the TS is called 'demux'. [0003] The TS is composed of fixed-length data packets, ...

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Problems solved by technology

Although the probability of this happening is very small, it must be dealt with to ensure the correctness of reuse

[0007] The current statistical multiplexing control strategy is mostly feedback joint statistical multiplexing at the multiplexer side. The multiplexer estimates the future bit rate requirements of each program based on the past bit rate of each program. This estimation method is rough and cannot be accurate. Estimate the future code rate requirements of the program, thus affecting the accuracy of statistical multiplexing bandwidth allocation

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