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Method and apparatus for recording and reproducing video data, and information storage medium in which video data is recorded by the same

Method and apparatus for recording and reproducing video data, and information storage medium in which video data is recorded by the same description/claims

This application is a continuation of U.S. patent application Ser. No. 09/978,771, filed Oct. 18, 2001, now pending, which claims the priority of Korean Patent Application Nos. 2001-47142, 2001-60257, and 2001-63377, filed on Aug. 4, 2001, Sep. 27, 2001, and Oct. 15, 2001, in the Korean Intellectual Property Office, the disclosures of which are incorporated herein in their entirety by reference.

1. Field of the Invention

The present invention relates to a method of recording and reproducing video data, and more particularly, to a method of recording and reproducing video data and hypertext data.

2. Description of the Related Art

Video data and hypertext data are multiplexed in a digital broadcast signal. The video data and the hypertext data are transmitted in the form of a MPEG transport stream (TS). A user receives an MPEG TS and records it in an information storage medium and can reproduce the MPEG TS when he/she wants to see it.

FIG. 17 is a diagram for explaining the problem of the prior art. Referring to FIG. 17, video data (a) and hypertext data (b) are separately decoded and composed, so an MPEG TS is reproduced as a composition (c). However, when the video data (a) in the MPEG TS has been decoded and video data (a′) re-encoded in another way has been recorded, the video data (a′) and the hypertext data (b) are not properly composed and displayed during reproduction.

To solve the above-described problems, it is an object of the present invention to provide a method and apparatus for properly reproducing video data and hypertext data even if the video data has been re-encoded in a different way and recorded, and an information storage medium.

To achieve the above object of the invention, in one embodiment, there is provided a method of recording video data in an information storage medium. The method includes the steps of (a) decoding originally encoded video data; (b) re-encoding the decoded video data in a different way to the originally encoded video data; (c) generating video transform information which is to be referred to for decoding the video data into its original state; and (d) recording the generated video transform information and the re-encoded video data.

In another embodiment, there is provided a method of recording video data in an information storage medium. The method includes the steps of (a) separating originally encoded video data from a bitstream containing the originally encoded video data and hypertext data and decoding the originally encoded video data; (b) re-encoding the decoded video data in a different way to the originally encoded video data; (c) generating video transform information which is to be referred to for decoding the re-encoded video data into its original state; and (d) multiplexing the generated video transform information, the re-encoded video data, and the hypertext data into a bitstream; and (e) recording the multiplexed bitstream in the information storage medium.

In still another embodiment, there is provided a method of recording video data in an information storage medium. The method includes the steps of (a) separating originally encoded video data from a bitstream into which the originally encoded video data and hypertext data are multiplexed and decoding the originally encoded video data; (b) re-encoding the decoded video data in a different way to the originally encoded video data; (c) generating video transform information which is to be referred to for decoding the video data into its original state; (d) recording the generated video transform information in a navigation data area of the information storage medium; (e) multiplexing the re-encoded video data and the hypertext data, which is to be reproduced together with the video data, into a bitstream; and (f) recording the multiplexed bitstream in a program area of the information storage medium.

To achieve the object of the present invention, there is also provided an information storage medium including video data which has been re-encoded in a different way to originally encoded video data, and video transform information which should be referred to for decoding the video data into an original state.

Preferably, the information storage medium further includes audio data reproduced together with the video data, hypertext data displayed together with the video data, and program configuration data necessary for reproducing the video data.

Preferably, the video data, the audio data, and the video transform information are multiplexed and recorded in a program area, or the video data, the audio data, and the hypertext data are multiplexed and recorded in the program area, and the video transform information is recorded in a navigation data area as the program configuration data.

More preferably, the video data, the audio data, and the hypertext data are multiplexed and recorded in the program area in the form of a Moving Picture Experts Group (MPEG) transmission stream, and the video transform information is recorded in the navigation data area as program map table (PMT) configuration information.

Preferably, the video transform information has been embedded in a video element descriptor as a video transform descriptor, and the video transform descriptor has a horizontal resolution, a vertical resolution, and an aspect ratio as variables.

There is also provided an apparatus for receiving an input bitstream and recording a bitstream in an information storage medium. The apparatus includes a filter for extracting video data from the input bitstream; a recorder for decoding the extracted video data, re-encoding the decoded video data in a different way to the originally encoded video data, recording the re-encoded video data, and recording video transform information which is to be referred to for decoding the video data into its original state; and a controller for generating and providing the video transform information to the recorder.

Preferably, the recorder records the video transform information in a program area together with the re-encoded video data or records the video transform information in a navigation data area.

The filter includes a demultiplexer for demultiplexing the input bitstream into video data, audio data, hypertext data, and program information data. The controller includes a video transform information generator for generating and outputting the video transform information which is to be referred to for decoding the video data into its original state. The recorder includes a video decoder for decoding the video data received from the demultiplexer, a video encoder for re-encoding the decoded video data, and a multiplexer for multiplexing the generated video transform information and the re-encoded video data.

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