Rarbg X265 Encoding Settings ((hot)) -

| Parameter Group | Specific Setting(s) | Explanation & RARBG's Rationale | | :--- | :--- | :--- | | | -c:v libx265 | Selects the x265 video encoder. | | | -pix_fmt yuv420p10le | Mandatory for RARBG-style quality . 10-bit depth reduces banding and improves efficiency for the same bitrate. Most modern hardware and software support this. | | | -preset slow | Balances encoding speed and final file size. It's the best compromise for high-quality releases, allowing for efficient compression without an impractical time cost. | | Quality & Bitrate Control | -crf 22 | Sets the base quality level. Lower is better/larger. The default x265 CRF is 28 (roughly equivalent to x264's CRF 23). An RARBG-style CRF of 22 is a significant quality upgrade, pushing beyond "acceptable" towards "visually transparent". | | | -maxrate 4500K -bufsize 9M | The "Cap" . CRF guarantees quality, but in complex scenes, bitrate can spike. The cap prevents the file from becoming huge by limiting the maximum bitrate to 4.5 Mb/s. The buffer ( bufsize ) helps the encoder manage this cap smoothly. | | -x265-params | max-merge=5 limit-refs=3 rd=4 rc-lookahead=48 bframes=8 aq-mode=3 | Tweaks the encoder beyond the slow preset. Rate-distortion level 4 ( rd=4 ) is higher than the default for slow (which is 4), ensuring a more detailed analysis. rc-lookahead=48 and bframes=8 give the encoder more room to plan future frames, improving compression for static scenes. aq-mode=3 dedicates more bits to flat, dark areas to prevent blocking artifacts. | | Scaling Filter | -vf "scale='trunc(min(1920/iw,1080/ih)*iw/2)*2:'...':flags=lanczos" | The "Scale to 1080p" filter. This ensures the output is 1080p or less. The complex math ensures the dimensions are even, a requirement for video codecs. flags=lanczos is a high-quality scaling algorithm that preserves sharpness, a typical choice for RARBG rips. |

: To keep file sizes tiny, they often opted for 2.0 or 5.1 lossy audio rather than lossless Atmos or DTS-X tracks. Rarbg X265 Encoding Settings

RARBG officially shut down due to a combination of Covid-related health issues affecting the team, the rising costs of European data centers, and complications arising from the war in Ukraine. Despite the shutdown, the specific x265 encoding blueprint left behind continues to set the standard for the scene. | Parameter Group | Specific Setting(s) | Explanation