Audio and video synchronous control method based on moving picture experts group (MPEG)-2

Abstract

The invention discloses an audio and video synchronous control method based on a moving picture experts group (MPEG)-2. According to the method, own information dependence on a program stream (PS) and a transition stream (TS) is avoided, and system timing clock (STC) calibration is directly performed on a program timing stream (PTS) information in a packetized elementary stream (PES), so that a synchronization effect can be achieved under the condition that a program clock reference (PCR) or a system clock reference (SCR) are not accurate. According to a solution that the PS is required to be converted to the TS or the TS is required to be converted to the PS, a PCR packet of the TS or a SCR packet of the PS are not required to be rebuilt in a conversion processing program, so that the load of a system processor is reduced, and the program implementation difficulty is reduced.

Description

technical field [0001] The invention relates to the field of audio and video decoding, in particular to an audio and video synchronization control method based on MPEG-2 video streams. Background technique [0002] The Chinese invention patent application number is: "200610017021.X", and the patent name is: "Audio and Video Signal Synchronization Method". Correlation of the two mid- and low-frequency systems with the smallest distance in the quantized coefficient block, embedding the compressed audio coding bits into one of the coefficients, and then performing the same procedure on the coefficient block embedded in the compressed audio bits as in the original video coding system Variable length coding or arithmetic coding can obtain the coded bit stream of the mixed signal, and the embedded video coefficient can be restored in the decoder according to the proposed audio bit, which provides key technical support for the audio and video signal synchronization system. [0003...

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Problems solved by technology

[0004] At present, some embedded video decoding chip solutions on the market can only support TS streams. For PS stream videos, transcoding is required. Due to the limitation of embedded system performance, it is very difficult to perfectly realize the structure of PCR packets. Difficult, misalignment or lack of PCR will cause STC to be unable to recover, so that the audio and video synchronization missing reference cannot be synchronized

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