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Data recording device, method, and data reproduction device and method

A data recording and data reproduction technology, applied in the field of data structure, can solve problems such as non-guarantee

Active Publication Date: 2012-07-04
SONY CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0016] Therefore, in the prior art, when a video stream that has been encoded by an encoding system such as the MPEG-4AVC|H.264 system capable of referring to a plurality of past pictures is recorded to a recording medium and then reproduced therefrom, if the I A picture is recorded in EP_map as a randomly accessible position (entry point), and the picture reproduced with random access is not guaranteed to usually start with an I picture

Method used

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  • Data recording device, method, and data reproduction device and method
  • Data recording device, method, and data reproduction device and method
  • Data recording device, method, and data reproduction device and method

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Embodiment Construction

[0048] Embodiments of the present invention will be described below. figure 2 A schematic structure of an application program format on a recording medium used in the recording and reproducing system according to the present invention is shown. This format has two layers for managing PlayList and Clip of AV stream.

[0049] A pair of one AV stream and its additional information is regarded as one object and called a clip. An AV stream file containing an AV stream is called a cut AV stream file, and a file containing corresponding additional information is called a cut information file.

[0050] The content of the clip AV stream file is mapped on the time axis. The playlist is specified by a time stamp corresponding to an access point in the cut. When the playlist indicates an access point of a time-stamped clip, the clip information file is used to find address information indicating the decoding start address of the stream.

[0051] A playlist is a reproduction area grou...

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PUM

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Abstract

When a video stream is encoded so as to have a prediction mode for predicting a future picture in the display order as compared to an I picture by using a past picture in the display order as compared to the I picture and it is recorded on a recording medium, random access of the video stream reproduced from the recording medium is enabled. During encoding, limit is performed to inhibit the prediction mode for predicting the future picture in the display order as compared to the I picture by using a past picture in the display order as compared to the I picture. Moreover, EP_map is created for correlating the I picture reproduction time information with the packet number to contain the I picture and it is recorded on the recording medium together with the packetized encoded stream. Duringreproduction, according to the packet number obtained by searching the EP_map by using the specified reproduction time, decoding of the encoded stream reproduced from the recording medium is controlled. It is possible to guarantee random access reproduction performed by specifying the reproduction time.

Description

technical field [0001] The present invention relates to a data recording device, method, and program, data reproducing device, method, and program, recording medium, and data structure that allow recording and reproducing interframe-compressed video data. Background technique [0002] A technique of recording an AV (Audio, Video) stream in which video data and audio data are multiplexed on a recording medium has been put into practical use. Furthermore, it is described in Patent Document 1 "Japanese Patent Application Laid-Open No. 2000-341640" and Patent Document 2 "Japanese Patent Application Laid-Open No. 2002-158972" that information on a randomly accessible position of an AV stream is used as an attribute A technology that records information to a recording medium together with an AV stream and reproduces the AV stream using the attribute information, thereby allowing a decision on a reading position and a decoding process to be performed quickly. [0003] As a more sp...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04N5/92G11B20/10G11B20/12H04N5/93H04N7/32G11B27/034G11B27/10G11B27/32H04N9/804H04N9/82H04N19/40H04N19/50H04N19/503H04N19/577
CPCG11B27/105H04N9/8205G11B20/10G11B2220/2562H04N9/8042G11B2220/216G11B27/034G11B20/12G11B27/329G11B2220/2545G11B2220/213G11B2220/218H04N19/00587H04N7/361G11B2220/2541H04N19/51H04N5/92H04N19/50
Inventor 加藤元树
Owner SONY CORP
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