Method and device for encoding and decoding video

Abstract

The invention discloses a method and a device for encoding and decoding a video. The method comprises the following steps: executing a selection of an intra frame predictive mode according to available adjacent blocks, writing in the available marks of each adjacent block in a code stream when the selected intra frame encoding mode is a limited DC predictive mode; thus, determining that the limited DC predictive mode is adopted for encoding by a current block at an decoding end, and then analyzing the available marks for indicating whether adjacent blocks are available, and determining available adjacent blocks according to the available marks of the adjacent blocks so as to perform decoding operation according to available adjacent blocks based on the DC predictive mode. The embodiment of the invention can set availability of left adjacent blocks and upper adjacent blocks of the DC mode when the intra frame encoding mode is the DC predictive mode, thereby ensuring the error recovery performance to improve the performance of encoding and decoding in a video communication system.

Description

technical field [0001] The present invention relates to the field of communication technology, in particular to a video codec technology. Background technique [0002] In the video communication system, video data error or packet loss is usually unavoidable. Therefore, it is necessary to adopt corresponding measures to improve the anti-error ability of video data, so that the video information can recover from the error as soon as possible, and provide users with Provide a better subjective experience. [0003] At present, an anti-error code implementation solution provided is an intra-frame refresh method, through corresponding intra-frame refresh, corresponding error recovery can be realized to a certain extent. Such as figure 1 As shown, the P frame is encoded using the inter-frame mode, and the corresponding IR frame is a refresh frame, and part or all of the macroblocks in the IR frame are encoded using the intra-frame coding mode, that is, the intra-frame coding in t...

AI Technical Summary

Problems solved by technology

[0006] In the above-mentioned intra-frame refresh method, if the adjacent macroblock of a certain refreshed macroblock is an inter-predicted macroblock (i.e. P macroblock), since the P macroblock may refer to the previous P frame, the P macroblock will be It is possible to accumulate the corresponding transmission error from the previous reference P frame, and will pass the error to the refresh macroblock (i.e. the I macroblock in the IR frame), so that the refresh macroblock may also be affected by the transmission error, and then Reduced error resilience of the intra refresh method

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