Processor and method for switching time axis in audio-video data flow

Abstract

The invention consists of a storage unit for providing a video and audio data flow, a detecting module for detecting if the video and audio material flow is made a switch of system time sequence reference domain, a counting unit including a counter for recording the preset consecutive frequency of switching of system time sequence reference domain, a comparator for comparing value of the counter and enabling threshold and outputting the result of comparison, a time axis switching and processing unit for executing time axis switching processing program in video and audio flow according to the result of comparison to reduce the loading of encoder.

Description

technical field [0001] The present invention relates to a time axis switching processing device and method in an audio-visual data stream, in particular to a method for detecting consecutive predetermined occurrences of system timing reference field transitions in an audio-visual data stream to determine activation of the audio-visual data Mechanism for timeline switching handlers in streams. Background technique [0002] Up to now, various video and audio compression technologies have been gradually developed and widely used in information products such as digital TV and multimedia, among which MPEG compressed video and audio standards are represented. MPEG converts dynamic video data and audio data into standard MPEG audio and video data streams, which means recording video data and audio data to audio and video playback media (such as video recorders, digital versatile discs (DVD), cable or wireless transmission) A sequence of 0s and 1s. [0003] During the MPEG encodin...

AI Technical Summary

Problems solved by technology

[0006] Although the architecture of the E-STD model can solve the problem of system time sequence synchronization, when the system time sequence reference domain changes too frequently, it may cause the decoder to respond too late, resulting in playback problems. Take the Digital Versatile Disc as an example. It restricts the time point of the system timing reference domain conversion to be between the video object unit (VOBU) and the video object unit (VOBU). If this rule is not followed, the system timing reference will increase / decrease in a short period of time. Since all the decoders have not yet completed the first system timing reference domain conversion, and the second system timing reference domain conversion occurs again, the decoder cannot respond in time, and if the disc is damaged, it will also cause the audio-visual data stream to be lost in the system. The error in the timing reference field also causes the system timing reference to increase / decrease suddenly, but the prior art does not disclose any means for this problem to solve the problem of too frequent conversion of the system timing reference field

[0007] In view of this, how to propose a time axis switching processing device and method in the audio-visual data stream in order to improve the shortcomings of the traditional system timing reference domain switching too frequently, so that the decoder can not respond in time to produce playback problems, for a long time It has always been the user's ardent expectation and the inventor's memory, and the inventor has been engaged in the research, development, and sales practice experience of the time axis switching processing device and method related products in the audio-visual data stream for many years. And improved ideas, poor personal professional knowledge, after many researches and designs, special discussions, finally researched a time axis switching processing device and method in the audio-visual data stream, which can solve the above problems

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