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FastFlix vs ab-av1: catalog facts
FastFlix	ab-av1
Free Free and open source under the MIT licence.	Free Free and open source under the MIT licence.
Windows	Windows, Linux, Command line
Supports H.264, HEVC and AV1 Hardware and software encoding options	Finds the CRF automatically from a VMAF target Fast VMAF sampling instead of full trial encodes
Focused on encoding, not editing Encoder options can be overwhelming for beginners	Command line only Needs ffmpeg with the relevant encoders and VMAF installed
Downloadable app	Downloadable app
Open source	Open source
License: MIT	License: MIT
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 2, 2026

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