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Stunt stream generation method based on MPEG (Moving Picture Experts Group)-2 transmission stream

A technology of transport stream and special effects, applied in the direction of TV, two-way working system, electrical components, etc., it can solve the problems of frame size not remaining unchanged, transmission channel requirements, and applicability restrictions, etc., to achieve wide application and low operating environment requirements. , the effect of improving efficiency

Inactive Publication Date: 2011-02-16
天柏宽带网络科技(上海)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

The process of selecting data can be completed by the server or the set-top box, but this kind of scheme requires the decoder to additionally process the discontinuous code stream, that is, the applicability is limited
And another disadvantage is that because the size of I and P frames does not remain unchanged, in the case of simply selecting some data, the code rate changes at any time, and there are requirements for the transmission channel

Method used

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  • Stunt stream generation method based on MPEG (Moving Picture Experts Group)-2 transmission stream
  • Stunt stream generation method based on MPEG (Moving Picture Experts Group)-2 transmission stream

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Embodiment Construction

[0043] The technical solutions of the present invention will be further described below in conjunction with the accompanying drawings and through specific implementation methods.

[0044] In order to generate trick streams without re-encoding and decoding images, it is obvious that the original images must be used. Since I frames of intra-frame coded images can be decoded independently without relying on other image data, I frames can be used as the constituent images of the trick play stream, according to Play double speed requirements, select the appropriate I frame display to meet the fast playback requirements.

[0045] On the other hand, due to the MPEG-2 standard, there are only several fixed frame rates, and considering the normal transition between the normal code stream and the trick stream, most IPQAM devices and set-top boxes require a fixed bit rate, and the frame rate of the generated trick stream And the code rate should be consistent with the original code strea...

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Abstract

The invention discloses a stunt stream generation method based on an MPEG (Moving Picture Experts Group)-2 transmission stream. The method comprises the following steps of: extracting an I frame of an image set of a video program transmission stream packet; adding a plurality of P frames of which the motion vectors and the forecast errors are zero to form a new code stream; and carrying out MPEG-2 transmission stream packaging according to the new code stream to meet the requirements for the frame rate and the code rate so as to form a stunt stream. By adopting the technical scheme of the invention, the stunt stream conforming to the MPEG standard can be generated, thus special requirement are not required for decoders of terminal equipment such as a set top box, and the like.

Description

technical field [0001] The invention relates to the field of video-on-demand technology, in particular to a method for generating trick streams based on MPEG-2 transport streams. Background technique [0002] The on-demand TV system enables viewers to selectively watch programs stored in the media server. The server is connected to the user's set-top box and other equipment through a data transmission channel such as a broadcast network. When the viewer selects a program, the corresponding program data reaches the user terminal through the transmission channel. . In addition to being able to select a program, viewers also often wish to perform trick play operations such as fast forward and fast rewind on the program they are watching. Due to the limited bandwidth of the transmission channel, it is impossible to simply speed up the program transmission speed for fast playback requirements, and the server needs to send special trick play streams to solve the problem. [0003...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N7/32H04N7/173H04N7/26H04N21/236H04N21/2387
Inventor 陈宇洲
Owner 天柏宽带网络科技(上海)有限公司
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