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GPAC vs Subler: catalog facts
GPAC	Subler
Free Free and open source.	Free Free to download from the project's GitHub releases.
Windows, macOS, Linux, Command line	macOS
MP4Box gives fine control over MP4 muxing and demuxing DASH and HLS packaging with low-latency support	Muxes tracks from MOV, MP4 and MKV into MP4 without re-encoding Creates TX3G and WebVTT subtitles that work on Apple devices
Mainly command-line driven, with a steep learning curve Aimed at streaming workflows rather than editing	macOS only, requires macOS 10.13 or later Outputs MP4 only
Downloadable app	Downloadable app
Open source	Open source
License not stated	License not stated
No account needed	No account needed
Works offline	Not stated if it works offline
Official website Full listing and sources Checked October 1, 2026	Official website Full listing and sources Checked October 1, 2026

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