Open-source licenses

Last updated: 2026-10-12 · Applies to the FinalCap web editor at grepawk.com/v2 (preview)

The FinalCap web editor at /v2 edits your videos inside your browser using FFmpeg compiled to WebAssembly (ffmpeg.wasm). The FFmpeg cores we send to your browser (@ffmpeg/core-mt and @ffmpeg/core 0.13.0-finalcut.3, built from our ffmpeg.wasm fork with FFmpeg 8.0.1 (multithreaded) and 5.1.10 (single-thread), and the fallback core @ffmpeg/core 0.12.10; all served unmodified from /v2/ffmpeg-core/) are built with --enable-gpl and includes libx264 and libx265, so it is distributed under the GNU General Public License, version 2 or later.

Source code

The complete corresponding source code for that core is available from this website, next to the WebAssembly files, at /v2/vendor/ffmpeg/source/. It includes:

• the ffmpeg.wasm build recipe at the exact release commit of core 0.12.10 (ffmpegwasm/ffmpeg.wasm@71aa99d3, tag v12.15: Dockerfile, Makefile, build/*.sh, bindings and patched fftools), and build instructions;
• the exact source archive of FFmpeg 5.1.4, x264 and every other library compiled into the core, at the tag or commit the build uses;
• SHA-256 checksums for every archive, and a machine-readable version list;
• the license texts shipped in each source archive (linked in the table below).

Components in the FFmpeg WebAssembly core

Versions come from the ffmpeg.wasm Dockerfile and build/ffmpeg-wasm.sh at the release commit. The FFmpeg tarball is the official ffmpeg.org release of tag n5.1.4 (PGP signature).

JavaScript wrapper

License texts

• GNU General Public License v2.0 (governs the combined core, GPL-2.0-or-later): as shipped with FFmpeg · gnu.org
• GNU Lesser General Public License v2.1: as shipped with FFmpeg
• Each library's own license file: see the "License texts" column above.

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