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DVD optical disc data compression method and system

A technology for data compression and optical discs, applied in digital recording/reproduction, digital signal formatting, etc., can solve problems such as inability to guarantee data integrity, recording failure, etc., and achieve the effect of ensuring successful recording and integrity

Inactive Publication Date: 2013-11-13
WONDERSHARE TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] The technical problem to be solved by the present invention is to provide a DVD disc data compression technology for the defect that the integrity of the compressed data cannot be guaranteed and the defect that the recording will fail when the compressed data exceeds the size of the target disc. A kind of DVD disc data compression method and system

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  • DVD optical disc data compression method and system
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Embodiment Construction

[0040] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0041] The data encapsulation format adopted on DVD is PS (Program Stream) format, and DVD encapsulated in PS format has three kinds of files: VOB (Video Object) file, IFO (Information) file and BUP (Backup) file.

[0042] A VOB file includes mixed data: video data, audio data, subtitle data, and movie menu data. IFO files provide very important navigation information for playback, such as where to start playing, where a specific audio stream or subtitle stream is, etc., so as to extract parts of the movie. A BUP file is a backup file for an IFO file. A cell is the smallest unit on a DVD, and the...

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Abstract

The invention relates to a DVD optical disc data compression method which comprises the following steps: obtaining the size of a source disc and the size of a target disc, and calculating the size offiles which do not need to be compressed in the source disc and a compression factor; copying the files which do not need to be compressed in the source disc; analyzing an IFO file of each VTS in thesource disc, obtaining the size and the time length of each cell, and positioning each cell into data of a corresponding VOB file; extracting video, audio track and subtitle data from the data of eachcell, and obtaining the size of the video data of each cell; calculating the bit rate of the video data of each cell after compression, and carrying out re-compression and encoding on the video dataof the corresponding cell according to the bit rate; and generating new VOB files, IFO files and BUP files. The invention further discloses a system which uses the method. The utilization of the method and the system can not only ensure that the optical disc data after the compression is smaller than the size of the target disc and ensure the successful burning, but also ensure the integrity of the optical disc data after the compression.

Description

technical field [0001] The invention belongs to the field of data compression, and more specifically relates to a DVD disc data compression method and system. Background technique [0002] DVD discs are widely used in the distribution of movies and TV dramas. They are mainly divided into two types: DVD-5 and DVD-9, with capacities of 4.7G and 8.5G respectively. Due to the fragility of DVD media, it is necessary to transfer the data of the source DVD disc to Back up to a new disc, because the price of DVD-5 discs is lower than that of DVD-9 discs, so there is a need to back up DVD-9 discs to DVD-5 discs, that is, there is a DVD disc with a relatively large capacity To back up to DVD discs with relatively small capacity, it is necessary to compress the disc data with relatively large capacity. DVD disc data includes video, audio tracks and subtitles. Since video accounts for the largest proportion, the compression is mainly for video compression, while audio tracks and subtit...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G11B20/10G11B20/12
Inventor 宋洋蒋义勇
Owner WONDERSHARE TECH CO LTD