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The widely used adaptive HTTP streaming requires an efficient algorithm toencode the same video to different resolutions. In this paper, we propose afast block structure determination algorithm based on the AV1 codec thataccelerates high resolution encoding, which is the bottle-neck of multipleresolutions encoding. The block structure similarity across resolutions ismodeled by the fineness of frame detail and scale of object motions, thisenables us to accelerate high resolution encoding based on low resolutionencoding results. The average depth of a block's co-located neighborhood isused to decide early termination in the RDO process. Encoding results show thatour proposed algorithm reduces encoding time by 30.1%-36.8%, while keepingBD-rate low at 0.71%-1.04%. Comparing to the state-of-the-art, our methodhalves performance loss without sacrificing time savings.

Fast Block Structure Determination in Av1-Based Multiple Resolutions Video Encoding