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The quad-tree with nested multi-type tree (QTMT) architecture that improves the compression performance of H.266\/VVC is introduced. Moreover, H.266\/VVC contains a greater number of intra-prediction modes than H.265\/High Efficiency Video Coding (HEVC), totalling 67. However, these lead to extremely the coding computational complexity. To cope with the above issues, a fast intra-coding unit (CU) size decision method and a fast intra-prediction mode decision method are proposed in this paper. Specifically, the trained Support Vector Machine (SVM) classifier models are utilized for determining CU partition mode in a fast CU size decision scheme. Furthermore, the quantity of intra-prediction modes added to the RDO mode set decreases in a fast intra-prediction mode decision scheme based on the improved search step. Simulation results illustrate that the proposed overall algorithm can decrease 55.24% encoding runtime with negligible BDBR.<\/jats:p>","DOI":"10.1186\/s13640-024-00622-7","type":"journal-article","created":{"date-parts":[[2024,3,18]],"date-time":"2024-03-18T16:01:48Z","timestamp":1710777708000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":3,"title":["Fast CU size decision and intra-prediction mode decision method for H.266\/VVC"],"prefix":"10.1186","volume":"2024","author":[{"given":"Mingying","family":"Li","sequence":"first","affiliation":[]},{"ORCID":"https:\/\/orcid.org\/0009-0003-6888-3890","authenticated-orcid":false,"given":"Zhiying","family":"Wang","sequence":"additional","affiliation":[]},{"given":"Qiuwen","family":"Zhang","sequence":"additional","affiliation":[]}],"member":"297","published-online":{"date-parts":[[2024,3,18]]},"reference":[{"issue":"5","key":"622_CR1","doi-asserted-by":"publisher","first-page":"1226","DOI":"10.1109\/TCSVT.2019.2949619","volume":"30","author":"B Bross","year":"2020","unstructured":"B. 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