Fec mechanism based on media contents

The present invention provides an Forward Error Correction (FEC) mechanism based on media contents. The mechanism includes: grading the media contents and giving them different importance values, then changing, according to the importance values of the frames to which packets belong and combining channel conditions and user experiences, the coding schemes for the packets to protect the packets according to the importance values of the frames to which the packets belong. With the technical solution of the present invention, for the data congestion caused by excessive coding in current FEC system, media contents are given different importance values by grading the media contents, signalings and an indicating bit are used for controlling usage of different FEC coding intensities; further, duplication expanding window fountain code with unequal error protection performance is used, and the maximum quality of the media contents is ensured while the great amount of data caused by the FEC is reduced.