File enciphering method and enciphered file structure in digital media broadcasting system
A playback system, digital media technology, applied in the direction of digital video signal modification, analog security/charging system, electrical components, etc., can solve the hidden danger of insecurity, cannot support playback system breakpoint resume, fast forward, fast reverse or skip broadcast and other issues to achieve the effect of guaranteeing benefits, reducing losses, and improving flexibility
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[0028] The following takes the original video stream file of MPEG-2 stream as an example, combined with the attached file figure 1 and 2 The present invention is described in further detail. The file encryption method in the digital media playback system includes the following steps:
[0029] Step 10: Use the MPEG group of pictures as the basic unit of segmentation of the original stream, and cut the entire original stream file into multiple segments by searching for the start code of the group of pictures in the original stream file.
[0030] The structure of the video raw stream is a hierarchical structure, and each syntactic structure contains one or more subordinate structures. The beginning of the original stream is the sequence header, which includes the bit rate, resolution and other parameters of the image, and other attributes of the image are stored in the sequence extension; each video sequence contains many groups of pictures, each group of pictures with a group ...
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