Rarbg X265 Encoding Settings Better Online

To achieve "better" results than standard RARBG x265 encodes (which often prioritized speed and small file size), you can use the following improved x265 settings. These adjustments focus on preserving detail and reducing artifacts like blocking and banding. Optimized x265 Encoding Settings

Disabling Sample Adaptive Offset (SAO) prevents the "smearing" often seen in low-bitrate x265 encodes. Example CLI Command (FFmpeg) rarbg x265 encoding settings better

2. Leveraging the x265 Presets

The x265 encoder has a setting known as preset, which ranges from ultrafast to veryslow (placebo). To achieve "better" results than standard RARBG x265

For 1080p SDR (Standard Dynamic Range):

Preset: Slow. This is widely considered the best balance; it uses more advanced compression algorithms than "Medium" without being excessively slow like "VerySlow". Profile: Main 10. Advanced Fine-Tuning (The "Solid" Build) Faster Presets: Encode quickly but produce larger files

Pass 1 (Analyze): -x265-params "pass=1:stats=stats.log:bitrate=2500:no-sao=1:aq-mode=3"

  • Faster Presets: Encode quickly but produce larger files for the same quality.
  • Slower Presets: Take much longer to encode but compress the video more efficiently.
  • --profile main10 : 10-bit depth. This is non-negotiable. Even for 8-bit sources, 10-bit encoding eliminates banding and improves compression efficiency by ~10%.
  • --no-sao : Sample Adaptive Offset softens the image. RARBG turned it OFF to preserve fine grain and texture.
  • --deblock -3:-3 : Sharpens the image significantly (default is 0:0). This gave their 2GB movies that "crisp" look, but it can cause blocking if the bitrate is too low.
  • --psy-rd 2.0 : The magic sauce. Psychovisual RDO distorts the image slightly to preserve texture. Most encoders use 1.0; RARBG pushed it to 2.0 for aggressive grain retention.

If you want the actual mathematical optimization behind their quantizer distribution, see "Rate-distortion optimization in HEVC" (Sullivan et al., IEEE TCSVT 2012) – that’s the deep paper underlying all x265, including RARBG’s tweaks.