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Device and method for recoding a video data stream

A technology for re-encoding and video streaming, applied in the direction of digital video signal modification, television, electrical components, etc., can solve the problem of expensive transcoding system

Inactive Publication Date: 2005-06-15
NEXTREAM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] This two-pass encoding technique is very efficient, but transcoding systems are expensive

Method used

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  • Device and method for recoding a video data stream
  • Device and method for recoding a video data stream
  • Device and method for recoding a video data stream

Examples

Experimental program
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Embodiment Construction

[0038] exist figure 1 A system representing a device 1 encoding a sequence of video images and a device 2 re-encoding the same sequence is described in .

[0039] The encoding device 1 is a one-pass type encoder.

[0040] The encoding device 1 transmits a data stream, in particular an audio / video stream, to a re-encoding device 2 . In the given embodiment, Encoding 1 and Recoding 2, the two devices are interconnected by means of a communication network, thus remote, but in another embodiment could be interconnected locally.

[0041] Re-encoding device 2 also receives the complexity associated with each image of the input video stream, X ini , and the incompressible overhead, Overhead ini , representing the respective complexity and incompressible overhead of the initial encoding performed by the encoding device 1 in the video stream.

[0042] The re-encoding device 2 also uses the re-encoding information caused by re-encoding the output stream. This recoding information i...

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Abstract

Image sequences are advantageously recoded based on an evaluation of complexities before and after trans-coding of the images. Initially, information is extracted representing at least the complexity of recoding each image. A complexity ratio is calculated in accordance with the complexities of images recoded previously using the aforementioned mode to the complexities of the initial coding of said images. After smoothing the complexity ratio undergoes updating. Each image is recoded according to the mode by estimating the complexity of each image to be recoded as the product of the complexity of the initial coding of the image by the smoothed complexity ratio for the mode.

Description

technical field [0001] The present invention relates to devices and methods for recoding video data streams. Background technique [0002] The development of multimedia applications and the diversity of data networks make the data coding system more complex. The interconnection of different kinds of networks often requires recoding the data streams they carry, usually involving transcoding. Re-encoding can be done with a different compression standard than from the original compression standard (e.g. re-encoding according to the MPEG-4 AVC standard ("Advanced Video Coding" is just an acronym) originally according to the MPEG-2 or MPEG-4 standard encoded data stream). [0003] Recoding is mainly used in networks with considerable bitrate constraints. Therefore, this re-encoding system may adapt to the bitrate of the incoming stream that demands the network and limits the network. [0004] Regulation of the bit rate for an MPEG-type video encoder or transcoder is undertake...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N7/26H04N7/50
CPCH04N19/105H04N19/159H04N19/172H04N19/149H04N19/61H04N19/126H04N19/14H04N19/152H04N19/177H04N19/40
Inventor 格扎维埃·迪克卢帕特里斯·亚历山大帕特里克·迪梅尔
Owner NEXTREAM