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Statistical multiplexing method based on parallel coding

A statistical multiplexing and coding technology, applied in the field of statistical multiplexing based on parallel coding, can solve the problems of increasing system delay, changing the code stream quality of the encoder, and high system complexity, so as to achieve the effect of improving efficiency and image subjective quality

Inactive Publication Date: 2012-10-10
北京博雅慧视技术有限公司
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Problems solved by technology

[0009] Closed-loop statistical multiplexing can realize arbitrary and continuous code rate adjustment, but requires centralized configuration and mutual reference of encoders, which has extremely high requirements on encoders and the environment, high system complexit

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Embodiment

[0041] The encoder takes AVS as an example, and it is applicable to encoding standards such as H.264 and MPEG4.

[0042] Assuming an application scenario, in a head-end system, there are 4 AVS encoders, which encode 4 sets of programs respectively, including CCTV1, CCTV5, CCTV10, and CCTV12, wherein CCTV5 is a high-priority program. Through the method of the present invention, no In the case of changing the existing head-end system, the optimization of the subjective quality of the image can be realized while making full use of the 6M bandwidth.

[0043] The method is to allocate 6M bandwidth to 4 programs. According to the priority arrangement, CCTV1 is allocated 1.8M, CCTV5 is allocated 2M, CCTV10 is allocated 1.2M, and CCTV12 is allocated 1.0M. According to these requirements, four types are set for the corresponding encoders. Different code rates, CCTV1 encoder is set to 2.0M, 1.8M, 1.5M, 1.2M, CCTV5 encoder is set to 2.5M, 2.2M, 2.0M, 1.8M, CCTV1 encoder is set to 1.6M, 1...

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Abstract

A statistical multiplexing method based on parallel coding includes: configuring an initial bitrate for an encoder for a program in each channel in advance according to overall bandwidth requirements; making statistical analysis on states of the programs in the channels in cache at a system multiplexing end, giving new bitrate setting requirements to output bitrate of the encoder for the program in each channel according to program priority requirements set by applications, and feeding back the new setting requirements to the statistical encoder in each channel; enabling the statistical encoder in each channel to output bit streams of bitrate closest to the requirements to a subsequent multichannel statistical multiplexing module according to the new bitrate setting requirements; enabling each multichannel statistical multiplexing module to receive the preceding bit streams obtained according to the new bitrate requirements for multichannel statistical multiplexing so as to form high-quality smooth multi-program multiplexed streams; and repeating the steps until complete playing of obtained multiplexed programs. With an existing head end system unchanged, bandwidth utilization efficiency and image subjective quality are improved by means of a method for optimizing a traditional multiplexer.

Description

technical field [0001] The present invention provides a statistical multiplexing method based on parallel encoding, and specifically relates to a code stream that outputs code streams with different code rates through parallel encoding by an encoder, and realizes efficient statistical multiplexing of code streams by optimizing and selecting these code streams method. Background technique [0002] Audio and video in multi-channel TV programs need to be multiplexed at the following two levels during transmission: [0003] 1. Program-level multiplexing: In the encoding system, the video and audio signals are encoded to generate their respective elementary stream ES (Elemertary Stream), and these ES streams and related synchronization data are multiplexed together to form an actual single-program transport stream TS (Transport Stream), this process is called program-level multiplexing. [0004] 2. System-level multiplexing: multiplexing between multiple TS streams, generally...

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Application Information

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IPC IPC(8): H04N7/24H04N7/26H04N7/52H04N21/236H04N21/266
Inventor 李革袁磊
Owner 北京博雅慧视技术有限公司
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