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A method of fec based on media content

A technology of media content and media resources, which is applied in the direction of digital transmission system and transmission data organization to avoid errors and prevent errors. It can solve problems such as good real-time performance, data congestion, and poor accuracy, so as to ensure the quality of media content and reduce data The effect of volume and complexity reduction

Active Publication Date: 2019-11-15
SHANGHAI JIAOTONG UNIV
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Problems solved by technology

[0011] In view of the defects in the prior art, the purpose of the present invention is to provide a 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 problem

Method used

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  • A method of fec based on media content
  • A method of fec based on media content
  • A method of fec based on media content

Examples

Experimental program
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Embodiment 1

[0037] This embodiment takes the MMT transmission protocol as an example

[0038] 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.

[0039] So...

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Abstract

The invention provides a media content-based FEC mechanism. According to the technical scheme of the FEC mechanism, media contents are graded and assigned with different importances. On the condition that the original media stream is not subjected to shunting, data packets are transmitted to corresponding FEC encoders according to the states of channels, the user experience and feeling and the importances of frames contained in media data packets, so that the data packets are protected at varying degrees. According to the technical scheme of the invention, for the data congestion condition caused by the excessive coding of a current FEC system, media contents are graded and assigned with different importances. Based on the signaling control and the indicating bit-based control, different FEC coding intensities are adopted. In this way, the quality of media contents is ensured to the maximum degree, while the large amount of data volumes caused by FEC is reduced. Meanwhile, source data streams of different priorities are not required to be divided into a plurality of data streams, so that the complexity of FEC coding at a transmitting end is reduced. The efficiency of FEC coding is improved.

Description

technical field [0001] The present invention relates to the technical field of multimedia transmission, and more specifically, to a media content-based FEC (forward error correction) method. 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 together, and th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L1/00
CPCH04L1/0041H04L1/0078H04L1/0079H04L1/0088
Inventor 张文军徐异凌汤旭国黄巍李博孙军管云峰柳宁
Owner SHANGHAI JIAOTONG UNIV
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