Rarbg X265 Encoding Settings Better <2K>

RARBG (and similar high-efficiency release groups like ION10) typically aimed for a "sweet spot" where file sizes are small enough for quick sharing but quality remains high enough for a clear viewing experience on 1080p screens

. While they never officially published their exact scripts, their encoding parameters can be reverse-engineered from the metadata found in their releases.

To get better results that mimic or improve upon RARBG’s x265 style, use the following configuration guidelines for tools like 1. The Core RARBG "Formula"

RARBG usually targeted specific average bitrates rather than using Constant Quality (CRF). However, for most home users,

is superior because it ensures consistent quality regardless of how complex a scene is.

Optimized x265 Encoding: Achieving the "RARBG" Balance RARBG releases became famous for their consistent balance of small file sizes (often around 1.5 GB to 2.5 GB for 1080p) and surprisingly good visual quality. To achieve or even improve upon these results, you can use modern x265 (HEVC) encoding parameters that prioritize efficiency and consistency. Key Settings for Better x265 Encodes

For high-quality, efficient video, use these recommended parameters in tools like Handbrake or via FFmpeg. rarbg x265 encoding settings better

Rate Control (CRF): Instead of a fixed bitrate, use Constant Rate Factor (CRF) for consistent quality.

CRF 20–22: Recommended for a high-quality "transparent" look on 1080p content.

CRF 22–24: Optimal for 4K content to keep file sizes manageable without visible artifacts.

Encoder Preset: The "Slow" or "Slower" presets allow the encoder more time to analyze the video, resulting in better quality per megabyte of data. Avoid "Placebo" as the gains are negligible for the massive time increase.

Bit Depth (10-bit): Even for 8-bit sources, encoding in 10-bit (Main10) significantly reduces "banding" in dark scenes or sky gradients.

Audio: To match the RARBG standard, use AAC-LC with a bitrate of 224 kb/s for 2-channel or 5.1 surround sound to save space while maintaining clear audio. Optimized Parameter Strings Why Were These “Better” Than Typical x265

If you are using advanced tools, adding these specific custom parameters can further refine the output: Suggested x265 Parameters General Film preset=slow:crf=21:aq-mode=3:psy-rd=1.0:psy-rdoq=1.0 High Grain/Action preset=slow:crf=20:limit-sao:bframes=8:psy-rd=1.5:aq-mode=3 Animation/Anime

preset=slower:crf=19:bframes=8:aq-mode=3:aq-strength=0.8:deblock=1,1 Comparison: Why x265 is Better than x264

While the original RARBG standard often used x264 for compatibility, switching to x265 provides several advantages:

Higher Efficiency: Achieving the same quality as x264 at roughly 50% the bitrate.

Better Outlines: x265 handles sharp edges and outlines better, especially in high-resolution content.

Reduced Artifacts: It is much less prone to "blocky" artifacts in blurred or bokeh areas. 8-bit encoding (more banding, less efficient) CRF 23–24

For more detailed guides on specific presets, you can refer to the official x265 documentation.

Why Were These “Better” Than Typical x265?

At the time (2018–2023), most other x265 groups used:

• 8-bit encoding (more banding, less efficient)
• CRF 23–24 (smaller files but visible artifacts)
• Preset faster/veryfast (speed over quality)
• SAO enabled (smoother but softer image)

RARBG’s settings achieved better subjective quality per megabyte by:

1. 10-bit – Gains ~15–20% compression efficiency with no quality loss.
2. Psy optimizations – Retained grain and texture, avoiding the “waxy” look of many low-bitrate x265 encodes.
3. AQ-mode 3 – Avoided color banding and blocking in dark scenes.
4. No SAO – Kept sharp edges, didn’t oversmooth.

The trade-off: slower encoding (about 30–50% slower than default medium preset) and slightly higher peak bitrate for complex scenes.

Breaking down the "RARBG Upgrade" flags

Let’s compare RARBG vs. Our settings.

| Feature | RARBG | Our "Better" Setting | Why it wins | | :--- | :--- | :--- | :--- | | Preset | Medium | Slow | 15% smaller file for same quality, or 15% better quality for same size. | | SAO | Auto (On) | no-sao=1 | Preserves grain. Faces look like faces, not plastic. | | AQ Mode | 2 (Auto-variance) | aq-mode=3 (Auto-variance with bias) | Dark scenes (Game of Thrones) retain shadow detail. | | Psycho-Visual | Low (1.0) | psy-rd=2.0 | Retains texture in grass, fabric, and skin pores. | | Deblock | Default (0,0) | deblock=-1,-1 | Sharper edges without ringing artifacts. | | Qcomp | 0.6 | 0.7 | Slightly more bitrate to high-motion scenes (explosions, sports). |

Part 4: The Definitive "Better Than RARBG" x265 Settings

Here is the command line for x265 (via FFmpeg or HandBrake CLI) that produces a superior file to RARBG at the exact same bitrate.