Method for achieving synchronization of audio and video on digital set top box

Abstract

The invention provides a method for achieving synchronization of audio and video on a digital set top box. The method includes the steps that a PTS 1 of newcome audio frames is used as a synchronous datum to be compared with a PTS 2 of video frames, if the difference value between the PTS 1 and the PTS 2 is smaller than a set threshold 1, the audio frames and the video frames are synchronous, the video frames are played in sequence, otherwise frame loss or repeated playing are performed on the video frames to enable the audio frames and the video frames to be synchronous, and meanwhile, and the number of the operated video frames are counted; if the number is smaller than a count threshold 2, the previous audio and video synchronous operation is continued, otherwise the previous synchronous operation is cancelled, the phenomenon that the video is not fluent due to continuous operation on the video frames is avoided, and user experience cannot be influenced; after the synchronous operation is cancelled for T2, the steps are performed in a circulation mode to perform audio and video synchronous control. The method can guarantee fluency of programs watched by users in a larger extend, and meanwhile guarantee synchronization of the audio and the video.

Description

Technical field [0001] The present invention relates to the technical field of digital television, in particular to a digital television box, in particular to a method for realizing audio and video synchronization on a digital set-top box, which is suitable for audio and video synchronization when the digital set-top box decodes digital television signals. Background technique [0002] In recent years, digital TV technology has developed rapidly, and it includes all links from source coding, channel coding and modulation, radio frequency transmission to terminal decoding. Due to the complex processing of audio and video signals in digital TV systems, in the actual process of watching digital TV programs, there is a time difference between the playback of audio frames and video frames, which leads to the phenomenon of sensory audio and video asynchronous. This phenomenon is very large. To a certain extent, it affects the user's experience and feeling of watching TV programs. [000...

AI Technical Summary

Problems solved by technology

In practical applications, since the PCR value will be modified when the digital TV front-end multiplexes multiple programs, and when the digital TV front-end multiplexing equipment is poor, it is easy to cause the actual PCR value of the program to differ from the PCR value received by the terminal. There is a difference between the audio and video decoding, which causes the audio and video decoding to be out of sync

[0004] In my country, in some areas, the front-end equipment of digital TV is poor, and the PCR value of the multiplexed programs fluctuates greatly, and the jitter is irregular, which makes the conventional PCR audio and video synchronization mechanism completely unable to adapt to this front-end environment.

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