Method and device for keeping audio and video synchronization by using speed conversion algorithm

An audio-video synchronization and audio technology, applied in image communication, selective content distribution, electrical components, etc., can solve problems such as inconsistency in playing content and impact on users' viewing, so as to improve continuity, integrity, and strong practicality Sex, the effect of solving asynchronous phenomena

Inactive Publication Date: 2013-12-11
ALLWINNER TECH CO LTD
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Problems solved by technology

This processing method will lead to inconsistency in the played content, which will easily affect the user's viewing

Method used

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  • Method and device for keeping audio and video synchronization by using speed conversion algorithm

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Embodiment Construction

[0018] refer to figure 1 In the flow chart described above, the audio and video variable speed flag is first initialized. Initially, the value of this flag is set to zero, indicating that the audio is played in the normal mode. The so-called normal mode refers to playing the audio in a constant speed mode. Audio is continuous audio in units of frames. When audio is played, each frame of audio is generally played frame by frame in the order corresponding to the video. Starting from playing the first frame of audio, compare the audio time stamp of this frame with the system time stamp to judge the relationship between the two:

[0019] If the audio time stamp is greater than the maximum value T1 allowed by the system time stamp, it means that the audio playback needs to wait, then set the audio variable speed flag to slow playback mode. In specific applications, set the audio variable speed flag value to a negative value to indicate slow playback The relationship between the sp...

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Abstract

The invention discloses a method and device for keeping audio and video synchronization by using the speed conversion algorithm. The method includes the steps of judging the relation between audio time stamps and system time stamps, collecting audio data again, increasing or decreasing the audio data, and quickening or slowing down audio play. Therefore, synchronization of audio and video play can be achieved. The method and device are easy to implement and strong in practicality, effectively solve the problem of asynchronization in the audio and video play process, do not need to discard non-synchronous audio and video data, effectively improve the continuity and integrity of videos, and meet user needs.

Description

technical field [0001] The invention relates to the field of video playback, in particular to a method and device for keeping audio and video synchronous by adopting a variable speed algorithm. Background technique [0002] When playing network video, cmmb radio, and digital satellite TV, the audio and video must be played synchronously. In the actual playback process, it is necessary to control the playback of audio and video so that the playback of audio and video is coordinated. Especially in video programs that need to be played in real time, the audio and video must be consistent with the system clock. In the existing technology, during the playback process, it is easy to produce code stream errors, or clock inconsistencies, threads out of synchronization, etc., resulting in out-of-synchronization of audio and video playback time, and sometimes serious audio and video out-of-frequency phenomena. That is, the played audio does not match the video at all, which affects ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N21/8547H04N21/6587
Inventor 张林山王晴陈小川
Owner ALLWINNER TECH CO LTD
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