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FFmpeg vs Aviator: catalog facts
FFmpeg	Aviator
Free Free and open source. The codebase is mainly LGPL 2.1 with some components under the GPL…	Free Free and open source under the GPL 3.0 or later.
Windows, macOS, Linux, Command line	Linux
Handles practically every container and codec there is Remuxes without re-encoding, so a container change is instant and lossless	Easy AV1 encoding without the command line Uses SVT-AV1 and Opus
Command line only, with syntax that punishes guessing Argument order matters in ways that are not obvious	Limited to AV1 video and Opus audio output Linux only
Downloadable app	Downloadable app
Open source	Open source
License: LGPL-2.1	License: GPL-3.0-or-later
No account needed	No account needed
Works offline	Works offline
Official website Full listing and sources Checked September 21, 2026	Official website Full listing and sources Checked October 1, 2026

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