Time-shifted video recording method

Abstract

The invention provides a time shifting video recording method using a ring buffer. Before storing an audio-visual signal, the method first judges the duration of the audio-visual signal; when the duration of the audio-visual signal is not greater than a rated duration, writes the audio-visual signal into the ring buffer according to a writable instruction in a buffer zone of the device; when the time length of the audio-visual signal is greater than the rated time length, the audio-visual signal is cut according to the rated time length, and several pieces of audio-visual data obtained after cutting are written in sequence according to the writable instruction into multiple buffers of the ring buffer. Wherein, each of the above-mentioned buffers has a header for recording the time index and file size of the audio-visual data stored in the buffer to be used when reading the audio-visual data of the ring buffer. According to the present time shift video recording method, fast and accurate video and audio signal playback can be realized.

Description

technical field [0001] The invention relates to a video recording method, in particular to a time shifting video recording method. Background technique [0002] Time shifting is a common function of today's video recorders. The user can use the time-shifting function of the video recorder to play back the content of the program that was just missed. Since the time shifting technology only needs to store the previous frames within a limited period of time, the commonly used buffer is a ring buffer which can recycle the storage space. [0003] figure 1 A case where a ring buffer 100 is used for conventional time shifting techniques. When the time shifting function of the video recorder was activated, an audio-visual signal would be completely written into a buffer of the ring buffer 100 (such as figure 1 buffer 102). The position indicated by the mark 104 is the header of the buffer 102, which contains the information of the audio / video signal, such as the time index and ...

AI Technical Summary

Problems solved by technology

[0005] In order to solve the time-consuming problem in the time-shifting technology and the problem of not being able to accurately locate the time point of the audio-visual signal to be played back, the present invention provides a time-shifting video recording technology to achieve fast audio-visual playback, and to locate the time point more accurately

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