Safety and protection high-definition video reverse playing method and device

Abstract

The invention belongs to the field of video technology processing, and particularly relates to a safety high-definition video reverse playing method and device, the device comprises an analysis module, a first cache module, a second cache module, a cache management module and a playing display module, the analysis module is used for analyzing a target code stream and outputting a frame type and aframe unique identifier of each frame; the first cache module is used for storing the frame type and the frame unique identifier output by the analysis module according to a playing sequence and a GOPmode; the second cache module is used for storing the frame type or the frame unique identifier of the first cache module; the cache management module is used for setting a cache strategy of the second cache module and exchanging the content in the first cache module into the second cache module according to the cache strategy; and the playing display module is used for playing the images in thesecond cache module in an inverted sequence. According to the scheme, through a speed multiplication factor segmented multi-stage caching method, a balance is attempted to be found in the aspect of CPU and memory consumption, so that excessive CPU and memory consumption is avoided, and the requirement of multi-path and speed multiplication smooth reverse playing is met.

Description

technical field [0001] The invention belongs to the field of video technology processing, and in particular relates to a security high-definition video playback method and device. Background technique [0002] At present, the encoding formats on the market are mainly video format files that are segmented, that is, a group of sequence frames, for inter-frame and intra-frame compression encoding, such as h264, h265, mpeg-4 and other formats. This type of video encoding frame is divided into multiple Types, such as I, P, B frames, where the I frame occurs periodically, and with the I frame as the boundary, a group of GOP (Group of Pictures, Group of Pictures) is formed between two I frames, such as figure 1 . I decoding can be decoded correctly without referring to other frames, but P frame decoding must refer to the previous I frame to decode correctly, otherwise, the video will appear blurred or cannot be played. When the video is played backward, since the I frame is alway...

AI Technical Summary

Problems solved by technology

Although the prior art scheme 2 adopts a partial buffering strategy, except for the last part of the span buffer length in the GOP, which does not need to be decoded repeatedly, the rest need to be decoded multiple times, and the later the decoding times, the more times, for example, 50 frames The size of the GOP, the frame number is 0-49, assuming that the buffer can buffer 10 frames at a time, except for the 40th-49th frame that only needs to be decoded once, the rest need to be decoded multiple times, the 39th frame needs to be decoded twice, and the 38th frame It needs to be decoded 3 times, and so on. This method will greatly consume CPU resources and cannot meet the requirements of multi-channel playback and double-speed playback.

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