Presets like medium or slow are the workhorses. veryslow offers only marginal gains for a massive increase in encoding time and is rarely worth it for casual use.
cpuid=1111039 / frame-threads=4 / wpp / bframes=4 / b-adapt=2 / rc-lookahead=25 / scenecut=40 / ctu=64 / ref=4 / rd=4 / psy-rd=2.00 / psy-rdoq=1.00 / aq-mode=3 / aq-strength=1.00 / cutree / rc=abr / bitrate=2000 Key Settings Breakdown: Why it matters Medium/Slow Slow allows for better motion estimation. 10-bit depth reduces color banding, even for 8-bit sources.
The signature RARBG x265 rip focused heavily on and universal hardware compatibility . While purist encoders aim for transparency (making the encode look identical to the source), RARBG optimized for the "transparent enough" threshold. Their releases generally targeted:
rather than a fixed bitrate. RARBG typically targeted a CRF between = Higher quality, larger file. Higher CRF = Lower quality, smaller file. Rarbg X265 Encoding Settings
Set to Automatic . RARBG strictly cropped away black letterbox bars to avoid wasting processing power on black pixels. Video Codec: H.265 10-bit (x265). Framerate: Peak Framerate (or Same as source). Encoder Preset: Slow. Constant Quality: 23 RF.
Using an MP4 container with AAC audio ensures the file plays on almost everything, from smart TVs to mobile devices.
Adaptive Quantization mode 3 (Auto-Variance) is aggressive. It dedicates more bits to dark, complex scenes. Most encoders use mode 2. RARBG used mode 3 to ensure that dark scenes in The Batman or Game of Thrones didn't turn into a pixelated mess. Presets like medium or slow are the workhorses
An encode is only as good as its multiplexing. RARBG paired their efficient video with highly compatible audio tracks:
This selects the x265 video encoder and forces 10-bit encoding, even if the source is 8-bit. This is the foundation of RARBG's superior quality.
Video Codec: (do not select NVENC or QuickSync unless you favor speed over pure quality). Framerate: Same as source (Framerate mode: Peak Framerate). Encoder Preset: Slow . Quality: Constant Quality: 22 or 23 RF . 10-bit depth reduces color banding, even for 8-bit sources
or a similar command-line tool, here is the technical breakdown of the settings found in their releases:
: Main 10 (10-bit encoding is standard for HEVC to reduce banding).