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FFmpeg vs Constrict: catalog facts
FFmpeg	Constrict
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	Targets an exact output file size automatically Batch compression of multiple videos
Command line only, with syntax that punishes guessing Argument order matters in ways that are not obvious	Steep size reductions can badly hurt quality or fail Speed limited by local hardware
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.