Learning From Coding Features: High Efficiency Rate Control for AOMedia Video 1

Rate control, which typically includes bit allocation and quantization parameter (QP) determination, plays an important role in real-world video coding applications. In this article, we propose a novel rate control scheme for AOMedia Video 1 (AV1) that provides adaptive bit allocation and effective QP determination. In particular, two supporting vector regression models are learned for the hierarchical bit allocation and frame-level parameter estimation. To train the models, the multipass coding strategy is utilized for training data acquisition. Compared to the default scheme in AV1 and the state-of-the-art method, the proposed rate control scheme achieves superior performance in terms of bitrate accuracy and coding efficiency.