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FFmpeg vs Adapter: catalog facts
FFmpeg	Adapter
Free Free and open source. The codebase is mainly LGPL 2.1 with some components under the GPL…	Free Freeware with no stated limits or restrictions.
Windows, macOS, Linux, Command line	Windows, macOS
Handles practically every container and codec there is Remuxes without re-encoding, so a container change is instant and lossless	Batch conversion for video, audio and images Previews conversions beside the original files
Command line only, with syntax that punishes guessing Argument order matters in ways that are not obvious	Available for Mac and Windows.
Downloadable app	Downloadable app
Open source	Closed source
License: LGPL-2.1	License not stated
No account needed	Not stated if an account is needed
Works offline	Not stated if it works offline
Official website Full listing and sources Checked September 21, 2026	Official website Full listing and sources Checked October 8, 2026

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