The preset determines how hard the encoder works to meet the quality target set by your CRF value. The x265 presets range from ultrafast (fastest, least efficient) to placebo (incredibly slow, maximum efficiency).
The following comprehensive guide breaks down the core concepts, recommended settings, and step-by-step methods to successfully shrink x265 video files without destroying visual quality. The Mechanics of HEVC/x265 Compression shrinking x265
This comprehensive guide will walk you through the core concepts of x265 re-compression and provide actionable step-by-step workflows to shrink your media library down to an absolute fraction of its current size. 1. Core Concepts: How x265 Compression Works The preset determines how hard the encoder works