4K 120 fps HEVC encoder with multi-chip configuration

Yuya Omori, Ken Nakamura, Takayuki Onishi, Daisuke Kobayashi, Tatsuya Osawa, Hiroe Iwasaki

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)


This paper describes a novel 4K 120 fps (frames per second) real-time HEVC (High Efficiency Video Coding) encoder for high-frame-rate video encoding and transmission. Motion portrayal problems such as motion blur and jerkiness may occur in video scenes containing fast-moving objects or quick camera panning. A high-frame-rate solves such problems and provides a more immersive viewing experience that can express even the fast-moving scenes without discomfort. It can also be used in remote operation for scenes with high motion, such as VAR (Video Assistant Referee) systems in sports. Real-time encoding of high-frame-rate videos with low latency and temporal scalability is required for providing such high-frame-rate video services. The proposed encoder achieves full 4K/120 fps real-time encoding, which is twice the current 4K service frame rate of 60 fps, by multichip configuration with two encoder LSI. Exchange of reference picture data near a spatially divided slice boundary provides cross-chip motion estimation, and maintains the coding efficiency. The encoder supports temporal-scalable coding mode, in which it output stream with temporal scalability transmitted over one or two transmission paths. The encoder also supports the other mode, low-delay coding mode, in which it achieves 21.8 msec low-latency processing through motion vector restriction. Evaluation of the proposed encoder's multichip configuration shows that the BD-bitrate (the average rate of bitrate increase), compared to simple slice division without inter-chip transfer, is −2.86% at minimum and −2.41% on average in temporal-scalable coding mode. The proposed encoder system will open the door to the next generation of high-frame-rate UHDTV (ultra-high-definition television) services.

Original languageEnglish
Pages (from-to)749-759
Number of pages11
JournalIEICE Transactions on Communications
Issue number7
Publication statusPublished - 2021
Externally publishedYes


  • Encoder
  • HEVC
  • High frame rate
  • Low delay
  • Temporal scalability

ASJC Scopus subject areas

  • Software
  • Computer Networks and Communications
  • Electrical and Electronic Engineering


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