CallCopilot uses FFmpeg and ffprobe as separate command-line executables.

The installer downloads a pinned Windows x64 Essentials package directly from
Gyan Doshi's distribution. FFmpeg's official download page links this provider:
https://www.ffmpeg.org/download.html
https://www.gyan.dev/ffmpeg/builds/

Pinned release: 9.0.2 Essentials, checked 2026-10-04.
SHA-256: 60f467265b1e312373dbcd92200c2618a74850f98d3d078e94296bb3fa2047ba
Checksum source:
https://www.gyan.dev/ffmpeg/builds/packages/ffmpeg-9.0.2-essentials_build.zip.sha256
Source revision linked by the build provider:
https://github.com/FFmpeg/FFmpeg/commit/946fcce07b
Build provider and dependency/build configuration information:
https://github.com/GyanD/codexffmpeg

The provider identifies these static binaries as GPL version 3 builds.
The complete vendor LICENSE, README, documentation and recorded hashes remain
in tools/ffmpeg/9.0.2 next to the binaries. The download is separate from the
CallCopilot code payload and does not edit the system PATH or registry.

Redistribution gate: a notice or source URL alone must not be treated as proof
that GPL corresponding-source obligations have been met. Before distributing
FFmpeg binaries, a release owner must choose and document the applicable GPLv3
section 6 route, supply/access the complete corresponding source (including
relevant linked libraries and build scripts), and retain the license and notices.
If relying on a written source offer, confirm that this is an applicable route
and satisfy its terms; this file is not itself such an offer. No legal clearance
or complete corresponding-source bundle is claimed by the offline checks.

Official license information:
https://ffmpeg.org/legal.html
https://www.gnu.org/licenses/gpl-3.0.html
