Dacx: Cross-Platform Music and Video Player

Fast, lightweight, open source media player for Windows, macOS, and Linux.

Built with Flutter + media_kit (libmpv).

Dacx is a desktop music and video player focused on speed and low overhead, with modern playback controls, media session integration, and broad format support.

⬇️ Download Dacx

Windows	MacOS	Linux
MSI: x64	DMG: Universal	DEB: x64
	ZIP: Universal	RPM: x64
		TAR.GZ: x64

Platforms

• Windows
• macOS
• Linux

Features

• Audio + video playback for MP3, FLAC, WAV, OGG, AAC, Opus, MP4, MKV, AVI, WebM, and more (anything libmpv handles).
• 10-band equalizer with presets.
• Multi-audio-track mixing via lavfi-complex (experimental and currently unstable).
• Resume playback from where you left off.
• Compact mode and always-on-top window.
• System media-session integration: lock-screen / Now Playing / SMTC controls, artwork, and scrubbing.
• File associations + custom document icon on Windows and Linux.
• Built-in update checker against GitHub releases.
• Notarized & Signed DMG and ZIP for macOS; signed installers via GPG for Windows and Linux.

Development

Note

This project uses Flutter/Dart but also NodeJS. Its a little bit messy and not the best of practices I know, im just the most familiar and confident with js scripting and node so thats how the project is controlled. Sorry :P

# Install Node.js dependencies (build scripts)
npm install

# Install Flutter dependencies
flutter pub get

# Run in development mode
npm run dev

# Run tests
npm run test:all

# Build for current platform
npm run build:win   # Windows
npm run build:mac   # macOS
npm run build:linux # Linux

Signing model

Only the macOS build is code-signed end-to-end (Apple Developer ID + notarization). Windows MSIs and Linux DEB/RPM/TAR.GZ artifacts are signed with a GPG detached signature (the project's release key) — there is no Authenticode certificate for Windows.

This means:

• scripts/flutter-build-macos.js requires APPLE_TEAM_ID in .env. Self-update pins against the team id. Set DACX_BUILD_DEV_NO_TEAM_ID=1 to skip for local dev:

  DACX_BUILD_DEV_NO_TEAM_ID=1 npm run build:mac

• scripts/flutter-build-windows.js accepts WINDOWS_SIGNING_CERT_THUMBPRINT (or DACX_WINDOWS_SIGNER_THUMBPRINT) optionally for local dev. If unset, the MSI is unsigned at the OS level and self-update relies on the Ed25519-signed update manifest. On release VMs, set the thumbprint in .env and add DACX_REQUIRE_WINDOWS_SIGNER=1 so npm run build:win fails when the thumbprint is missing (see SECURITY.md).
• scripts/flutter-build-linux is not affected by either.

macOS support

The macOS build targets macOS 15 (Sequoia) or newer. Older macOS versions are not supported.

License

GPLv3