Auto-Boost Av1an Portable
Fully automated AV1 encoding workflow for Windows. Drop .mkv files, double-click a batch .bat, done. Uses av1an with Auto-Boost for consistent visual-metric quality. Supports any quarter-step CRF SVT-AV1 fork, zones.txt, and multiple worke…
Auto-Boost is a technique for more consistent quality from Av1an encodes. A fast first encode is made at the base CRF, every scene is scored with SSIMULACRA2 (and in later versions XPSNR), and the CRF of each scene is then raised or lowered so that its score moves toward the average. The adjusted values are written as an Av1an zones.txt file and used for the final encode. Hard scenes get more bits; easy scenes give some back.
The scripts were written by nekotrix and others in the auto-boost-algorithm repository; the current script there, Auto-Boost-Essential, pairs with the SVT-AV1-Essential fork. Like Av1an’s own target-quality mode, it is slower than a single encode and spends bits by metric rather than by eye.
Auto-Boost Av1an Portable
Section titled “Auto-Boost Av1an Portable”Auto-Boost-Av1an-portable packages this workflow for Windows users who do not want to set up Av1an, VapourSynth and Python themselves. It is maintained (3.4.7, September 2026) and GPL-3.0 licensed. A Linux fork exists separately.
- Download and extract the release archive.
- Put your
.mkv,.mp4or.m2tsfiles invideo-input. - Double-click one of the included batch files, such as
autoboost-anime-crf30.batorautoboost-liveaction-crf30.bat, or runbat-builder.batto generate one for your content and hardware. - Collect the results from
video-output. The original audio and subtitle tracks are remuxed back in.
The autoboost-* scripts run the two-pass Auto-Boost process; the av1an-batch-* scripts do a single Av1an encode. You choose among bundled SVT-AV1 forks (5fish, essential, hdr, or your own build in custom). The first run benchmarks your machine to pick a worker count and whether SSIMULACRA2 can run on the GPU through Vship; delete tools\workercount-config.txt to repeat it. Interrupted batches resume on the next run, except that a file’s final pass restarts from the beginning.