The slow preset is the entry point for x265's advanced lookahead and motion estimation algorithms. It is significantly slower than medium (often doubling encoding time) but yields noticeably better compression (quality per filesize). As the official x265 documentation notes, slower presets test more encoding options, using more computations to achieve the best quality at your selected bit rate. For RARBG, this was the minimum acceptable standard—anything faster would compromise the "magic" by limiting RD (Rate-Distortion) optimization levels. Importantly, the slow preset is the first preset to enable subme=3 or higher, which activates chroma SATD (Sum of Absolute Transformed Differences), a critical tool for color fidelity.
To achieve a result that matches the low file sizes of a RARBG encode but yields significantly "better" visual fidelity, you must pivot away from mass-production shortcuts.
Utilizing Main10 profiles even for 8-bit source material to reduce color banding.
: Utilizing settings that play smoothly on modern TVs, tablets, and streaming sticks. Optimal Encoding Settings Breakdown rarbg x265 encoding settings better
preset=slower:crf=19:bframes=8:aq-mode=3:aq-strength=0.8:deblock=1,1 Comparison: Why x265 is Better than x264
The -preset determines the balance between encoding speed and compression efficiency. Most casual encoders use medium or fast . RARBG specifically chose slow as their baseline.
224kbps to 256kbps for 5.1 Surround; 128kbps for 2.0 Stereo. The slow preset is the entry point for
Burn in foreign audio subtitles (forced) or embed text-based SRT files to keep file overhead low. Advanced x265 CLI Command Line (FFmpeg)
Set Resolution Limit to Match Source (1080p or 2160p). Set Anamorphic to Automatic .
RARBG’s 10-bit x265 encodes were highly sought after because they minimized storage while retaining sharp details. Their formula relied on three core principles: Utilizing Main10 profiles even for 8-bit source material
The goal here is to prevent the CRF algorithm from skyrocketing the bitrate during incredibly complex scenes (like explosions, confetti, or heavy rain), which could result in absurdly large file sizes. Setting this cap ensures that even the most chaotic action scene won't bloat the movie, acting as a final check and balance for file size predictability.
x265 is naturally "smoother." For film-grain lovers, these settings might feel too "clean," but for modern digital shoots, it looks incredibly sharp. Comparison Table: RARBG-Style vs. Standard RARBG-Style (Optimized) Standard x264 10-bit (Better Gradients) ~2GB for 1080p ~5GB-8GB for 1080p Encoding Speed Very Slow (High CPU usage) Archiving large libraries Quick sharing/Legacy devices Are you looking to replicate these settings in a specific program like
Here is your consolidated reference for "Better than RARBG" encoding:
To definitively surpass the historic RARBG baseline, apply these final rules of thumb to your encoding queue:
Achieving the same quality as x264 at roughly 50% the bitrate .