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ab-av1 vs Aviator: catalog facts
ab-av1	Aviator
Free Free and open source under the MIT licence.	Free Free and open source under the GPL 3.0 or later.
Windows, Linux, Command line	Linux
Finds the CRF automatically from a VMAF target Fast VMAF sampling instead of full trial encodes	Easy AV1 encoding without the command line Uses SVT-AV1 and Opus
Command line only Needs ffmpeg with the relevant encoders and VMAF installed	Limited to AV1 video and Opus audio output Linux only
Downloadable app	Downloadable app
Open source	Open source
License: MIT	License: GPL-3.0-or-later
No account needed	No account needed
Works offline	Works offline
Official website Full listing and sources Checked October 2, 2026	Official website Full listing and sources Checked October 1, 2026

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