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Demultiplexing device

A technology for multiplexing and obtaining devices, which is applied in the directions of simultaneous/sequential multi-TV signal transmission, TV, color TV components, etc. The effect of convenience

Inactive Publication Date: 2005-08-03
PANASONIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this way, with the conventional inverse multiplexing device 800, the user cannot know the total time length of the content, which is lacking in convenience.

Method used

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Embodiment Construction

[0114] Next, an inverse multiplexing device and a multiplexing device according to an embodiment of the present invention will be described with reference to the drawings.

[0115] Fig. 12 is a data structure diagram showing the file format of MP4 file data handled by the inverse multiplexing device and the multiplexing device in this embodiment.

[0116] The MP4 file data 100 is composed of a basic area 100a and an extended area 100b, and is characterized in that the content information indicating the total time length of the content contained in the data 100 is stored in the basic area 100a. Due to the presence of this information, the user can know the total time length in the inverse multiplexing device, improving convenience. In addition, it is also possible to omit the provision of this information for a device that is difficult to provide such information, such as a multiplexing device for real-time recording.

[0117] The basic area 100a includes: a media data frame (...

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PUM

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Abstract

A demultiplexing device (200) includes a data acquisition unit (210) for acquiring MP4 file data (100), a decoding unit (213) for decoding the MP4 file data (100) acquired by the data acquisition unit (210) by demultiplexing each pair of moov (110) and mdat (110) and each pair of moof (130) and mdat (140), a content time length specification unit (211a) for specifying the total content time length according to the total content time length information contained in the moov (110) of the MP4 file data (100) acquired by the data acquisition unit (210), and a reproduction unit (214) for displaying the total content time length specified by the content time length specification unit (211a).

Description

technical field [0001] The present invention relates to an inverse multiplexing device for inverse multiplexing multiplexed data after multiplexing multimedia data such as image data and music data, and a multiplexing device for multiplexing multimedia data with the device. Background technique [0002] In recent years, MP4 has attracted attention as a file format for multiplexing and storing multimedia data (contents such as moving images, sounds, texts, and still images). [0003] MP4 is adopted as a file format, and its application scope is constantly expanding. The file format includes MPEG-4 as a dynamic image compression encoding method, and JPEG2000, the next-generation version of JPEG as a natural image compression encoding method. [0004] Originally, the MP4 file format is composed of a data frame and a header frame, the data frame is used to store the multiplexed content, and the header frame is used to store information related to the content of its data area. ...

Claims

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Application Information

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IPC IPC(8): H04N5/00H04N7/08
CPCH04N21/434H04N21/85406
Inventor 能登屋阳司松井义德远间正真井村康治大岳人
Owner PANASONIC CORP
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