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ab-av1FFmpeg
Free

Free and open source under the MIT licence.

 Free

Free and open source. The codebase is mainly LGPL 2.1 with some components under the GPL…

Windows, Linux, Command line Windows, macOS, Linux, Command line
  • Finds the CRF automatically from a VMAF target
  • Fast VMAF sampling instead of full trial encodes
  • Handles practically every container and codec there is
  • Remuxes without re-encoding, so a container change is instant and lossless
  • Command line only
  • Needs ffmpeg with the relevant encoders and VMAF installed
  • Command line only, with syntax that punishes guessing
  • Argument order matters in ways that are not obvious
Downloadable app Downloadable app
Open source Open source
License: MIT License: LGPL-2.1
No account needed No account needed
Works offline Works offline

Checked October 2, 2026

Checked September 21, 2026

Catalog facts only. Anything “not stated” is unconfirmed. Check full listings for details.