A method and apparatus for secure high-definition video rewind

Abstract

The invention belongs to the field of video technology processing. A method and apparatus for secure high-definition video rewind are particularly disclosed. The apparatus comprises: analysis module,a decoding module and a playback display module, wherein, the target code stream is analyzed by the analysis module to obtain a frame type of each frame and a frame unique identifier, GOP method is used for structured storage, at that same time, the information of each frame after decoding is selectively stored in the first level cache according to the speed factor segmentation multi-level cache strategy, the contents of the first level cache are exchanged into the second level cache according to the multi-level cache strategy, and the images in the second level cache are directly and sequentially pushed into the playing display module for reverse order display. This scheme tries to find a balance between cpu and memory consumption by multiplier and multilevel buffering, avoiding excessiveconsumption of cpu and memory, and satisfying the requirements of multipath and multiplier fluent reversal.

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 solution 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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