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FFmpeg vs ImageFlow: catalog facts
FFmpeg	ImageFlow
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 licence.
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	Outputs both GIF and WebP Exposes palette, dithering and frame rate settings
Command line only, with syntax that punishes guessing Argument order matters in ways that are not obvious	Small project with a single maintainer Linux only
Downloadable app	Downloadable app
Open source	Open source
License: LGPL-2.1	License: GPL-3.0-or-later
No account needed	Not stated if an account is 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.