Temporally Dependent Rate-Distortion Optimization for AV1 Encoder
IEEE international Symposium on Broadband Multimedia Systems and Broadcasting (BMSB)(2022)
Abstract
In current video coding schemes, although coding units are highly temporally exploited in the coding process, rate-distortion optimization (RDO) is performed independently with-out considering the dependency across coding blocks. This paper firstly investigates temporal multi-layer coding structure of AV1, and accordingly develops a long-term RDO model that takes into account the temporal dependencies across frames. Specifically, an impact factor of I-frame in terms of distortion propagation is first obtained, followed by the estimation of the impact factor of each frame in the multi-layer coding structure in descending order of importance. Consequently, an adaptive Lagrange multiplier determination method together with a temporally dependent RDO (TD-RDO) scheme is developed. We exemplify our method on state-of-the-art AV1 codec for testing. Experimental results show that in Random Access (RA) configuration, our proposed scheme can achieve an average of 2.07% BD-rate saving over the anchor AV1 encoder.
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Key words
video coding,AV1,temporal dependency,ratedistortion,optimization,BD-rate saving
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