concinnity

Watch videos together with others on the internet.

This application currently supports watching locally stored files. Support for remotely hosted files and YouTube videos is planned.

If you want to use concinnity with your friends, visit concinnity.retrixe.xyz. Else, if you want to self-host concinnity, see the instructions below.

Quick Start

• Prerequisites: You must have a PostgreSQL/MariaDB database setup, and Golang, Node.js and corepack are needed to build the application.
• To run the backend on a server:
  • Run go build in the backend folder to compile it.
  • Create a config.json in the same folder according to the section on backend configuration.
  • You can now run the backend using ./concinnity (it will run on port 8000 by default).
• To run the frontend on a server:
  • Run the yarn command in the frontend folder to install all dependencies.
  • Create a .env file in the frontend according to the section on frontend configuration.
  • For development purposes, you can run yarn dev to run the application with hot reload. For a production deployment, follow the SvelteKit instructions here.

Configuration

Frontend

The frontend requires only a single configuration file .env to be created in the frontend/ folder with the following contents:

# NOTE: Replace http://localhost:8000 with the correct URL that your backend is hosted at!
PUBLIC_BACKEND_URL=http://localhost:8000

Backend

The backend requires the config.json file to be created in the backend/ folder with the following options (all except databaseUrl are optional):

{
  "port": 8000,
  "basePath": "/",
  "secureCookies": false,
  "database": "optional: postgres (default, recommended) or mariadb",
  "databaseUrl": "see https://pkg.go.dev/github.com/lib/pq#hdr-Connection_String_Parameters (postgres) or https://github.com/go-sql-driver/mysql?tab=readme-ov-file#dsn-data-source-name (mariadb)"
}

The databaseUrl must be provided, and in production, it is recommended to make use of secureCookies as well. You may change the port as needed, and basePath should be modified if you are reverse proxying the backend through Apache/nginx/etc and placing the backend under another path.

⚠️ Note: MariaDB support will not work with Oracle MySQL or Percona.

Security Practices and Reverse Proxying

If self-hosting, you should take a look at Octyne's corresponding documentation, which is largely applicable to Concinnity's frontend and backend.

For further guidance, create an issue to expand this documentation.

API Documentation

The concinnity API is currently unstable and largely undocumented. You can find limited technical information in the backend's source code (with the frontend serving as an example of a fully functional client).

License

Copyright (C) 2025 retrixe

Concinnity is free software: you can redistribute it and/or modify it under the terms of the GNU Affero General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version.

Concinnity is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Affero General Public License for more details.

You should have received a copy of the GNU Affero General Public License along with Concinnity. If not, see http://www.gnu.org/licenses/.