A method and device for calculating code stream length

Abstract

The present invention relates to a code stream length calculation method and equipment, comprising: in the process of encoding video, at least two residual coefficients that need to be calculated in a decision mode to calculate the code stream length in the first video frame are obtained; the first A video frame is any video frame in the video; the length of the code stream obtained after encoding each residual coefficient in the at least two residual coefficients is calculated in parallel. In the code stream length calculation method provided by the embodiment of the present invention, when calculating the code stream length obtained after encoding the residual-coefficient, a parallel calculation method can be used instead of a serial method, which can greatly improve the calculation speed and shorten the obtained Cost time, improve the efficiency of video encoding. Especially in the process of real-time encoding, the method provided by the embodiment of the present invention will have relatively great advantages.

Description

technical field [0001] The present invention relates to the technical field of video encoding, in particular to a method and device for calculating the length of a code stream. Background technique [0002] When performing H.264 encoding, for each video frame, in order to select the optimal encoding mode, it is generally necessary to traverse each mode, and finally select the optimal mode through comparison. In mode selection, a commonly used basis for selection is Cost, which can be calculated by formula (1): [0003] Cost=Distortion+bit-count*lambda (1) [0004] Among them, Distortion is used to indicate the degree of difference between the compressed image and the uncompressed image. The larger the Distortion, the worse the effect of this mode. bit-count is the cost to describe the number of bits (bits) required to write all the information required for encoding into the code stream, that is, the length of the code stream obtained after encoding. The more bits required,...

AI Technical Summary

Problems solved by technology

Take the calculation of the bit-count of the residual coefficient (residual-coefficient) as an example. Since the calculation of the bit-count of the residual-coefficient is serially calculated, if the number of residual-coefficient is large, it is obvious that the calculation process of the bit-count It will be very slow, which will take a long time to get Cost and reduce the efficiency of video encoding

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