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An adaptive fec method based on media content

A media content and adaptive technology, applied in the field of multimedia transmission, can solve problems such as poor accuracy, good real-time performance, and good accuracy, and achieve the effects of improving efficiency, reducing complexity, and strong adaptability

Active Publication Date: 2019-07-19
SHANGHAI JIAO TONG UNIV
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Problems solved by technology

[0010] In view of the defects in the prior art, the purpose of the present invention is to provide an adaptive FEC method based on media content, so as to solve the problem of good real-time performance but poor accuracy, good accuracy but poor real-time performance, and excessive FEC coding in the current FEC system. data congestion

Method used

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  • An adaptive fec method based on media content
  • An adaptive fec method based on media content
  • An adaptive fec method based on media content

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Experimental program
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Embodiment 1

[0038] This embodiment takes the MMT transmission protocol as an example

[0039] In the MMT scheme, the MFU packages under the MPU package have different importances and lack the protection of unequal errors, so it is impossible to set a personalized transmission scheme. In MMT packets, frames of different importance (such as I frames and B frames) can be distinguished (with indicators) as shown in the attached Figure 2a-Figure 2b , with image 3 . However, the protection of unequal errors is not involved in the coding. Although the Two-stage structure scheme and LA-FEC can realize unequal error protection to a certain extent, they have low flexibility and high complexity. Especially for changing channel conditions and receiving users with different characteristics (such as different buffers), the existing two methods have large redundancy, poor adaptability, can only address a single situation, and cannot be considered from the perspective of user experience.

[0040] Solu...

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Abstract

The invention provides an adaptive FEC method based on media content. According to the method, media contents are graded; different importance is given, the original media data stream is not shunted,depending on current channel conditions, the importance degree of frames contained in the media data packet and a corresponding coding scheme are dynamically adjusted; a data packet is transmitted toa corresponding FEC (Forward Error Correction) encoder to carry out different degrees of protection, and a final source data stream is only encoded into one FEC code stream, so that the great data volume caused by the FEC is reduced while the media content quality is ensured to the maximum extent; a source data stream does not need to be shunted, so that the complexity of FEC coding of a sending end is reduced, and the efficiency of FEC coding is improved; the increase of data volume caused by FEC coding is greatly reduced; the coding scheme can be dynamically adjusted according to the changeof the current network state, so that the method has stronger adaptability to the time-varying network.

Description

technical field [0001] The present invention relates to the technical field of multimedia transmission, and more specifically, to an adaptive FEC (forward error correction) method based on media content. Background technique [0002] In the heterogeneous network media service system, the content is distributed to the terminal through the Internet protocol or broadcast protocol, the Internet uses IP / TCP or UDP packets to transmit media data, and the broadcast transmits content through MPEG2-TS. UDP packets may be lost after passing through multiple network devices, and broadcast TS streams may cause bit errors due to the influence of the transmission environment, resulting in broken screens or sound pauses on the terminal side. [0003] FEC (Forward Error Correction, Forward Error Correction) technology is a coding technology widely used in communication systems. The server side performs error correction encoding on the media data, adds redundant information and sends it tog...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L1/00
CPCH04L1/0009H04L1/0042
Inventor 徐异凌张文军黄巍汤旭国李博孙军管云峰柳宁
Owner SHANGHAI JIAO TONG UNIV
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