CRF is the holy grail of video encoding. Instead of forcing a specific bitrate (which wastes data on simple scenes and breaks apart on complex ones), CRF maintains a consistent visual quality. RARBG targeted a . In the x265 ecosystem, the default is 28 (visually low quality). A CRF of 22 is considered the industry standard for "transparent" or high-quality 1080p encodes. Lower numbers (18-20) result in near-lossless quality but explode file sizes. RARBG recognized that 22 is the point where quality is nearly indistinguishable from the source for 1080p material while maintaining practical file sizes.
The preset dictates how hard the encoder works to compress the video. : Slow rarbg x265 encoding settings better
This is arguably the most important flag. It forces the encoder to use a 10-bit color depth. While your source might only be standard 8-bit SDR (Standard Dynamic Range), encoding in 10-bit offers a massive advantage: it virtually eliminates . CRF is the holy grail of video encoding
This enables rect (rectangular motion partitions) and amp (asymmetric motion partitions), which help the encoder find patterns in the video much more efficiently. Tuning: None or Grain Leave tuning at None . In the x265 ecosystem, the default is 28
Burn in foreign audio subtitles (forced) or embed text-based SRT files to keep file overhead low. Advanced x265 CLI Command Line (FFmpeg)
Even if your source video is 8-bit (standard SDR Blu-ray), you should always encode using the x265 10-bit pipeline.
Never use fast or medium for x265 if you care about quality per gigabyte. Set your preset to .
