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https://github.com/learn-video/mosaic-video

Generate mosaics from video inputs
https://github.com/learn-video/mosaic-video

ffmpeg mosaic video

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Generate mosaics from video inputs

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# Mosaic Video



Generate mosaic videos from live inputs.



![Mosaic with two input videos and a background image](docs/static/sample.png)



## What is it?



*Mosaic Video* is a project designed to transform live streaming videos into nice mosaics in realtime.



It uses ffmpeg to capture the video and position them in a grid.



## Design



The project has two main components:

* Worker: a Go process that receives the inputs and generates the mosaic;

* Storage backend:

    * HTTP server that receives the mosaic through HTTP and stores it on S3;

    * Or a local storage backend (local filesystem).



![Mosaic Video design](docs/static/mosaic_design.png)



## Features



* Generate mosaic from multiple video inputs;

* Multiples audios support:

    * No audio;

    * First input audio only;

    * All inputs audios.

* Available inputs: HLS, RTMP and MP4;

* Available outputs: HLS;

* A simple HLS Player available in: http://localhost:8090/player;

* Dynamic scaling/positioning of the inputs;

* Dynamic background for each mosaic;

* Storage and delivery content options:

    * S3;

    * File system.

* VoD in looping.

    * To use like a promo video, see this [example](https://streamable.com/093xvt).



## Roadmap



* Support for running distributed workers.



## Running



To run the project, certain environment variables need to be set. These variables can be found in the [.env](.env) file.



Each worker, when running, fetches mosaic settings from an API. A mock API is available, detailed in [tasks.json](testing/tasks.json). Below is a breakdown of each field in the JSON:



* **name**: A string identifier for the mosaic configuration. In this case, it's set to "mosaic".

* **background_url**: The URL of the background image to be used in the mosaic. It is a link to an image file.

**medias**: An array of objects, each representing a media element in the mosaic. Each object in this array has the following fields:

    * **url**: The URL of the media source. This can be a live stream or a video file. Examples include HLS (.m3u8) links and local video files (e.g., "subscribe.mp4").

    * **position**: An object specifying the x and y coordinates (in pixels) of the top-left corner of this media element within the mosaic.

    * **scale**: The size of the media element in the format "width x height" (in pixels).

    * **is_loop** (optional): A boolean indicating whether the video should loop. This is relevant for video files rather than live streams.

* **audio**: This field specifies how the audio should be handled in the mosaic. The options include "no_audio", "first_input", or "all_inputs". In this JSON, it's set to "first_input", meaning only the audio from the first media input will be used.



## Commands



`just test` to run the tests.



`just lint` to run linters.



`just deps` starts a mock API, Redis and S3 backend.



`just worker` starts the go process to generate mosaics.



`just storage` startes the uploader component.



`just player` starts the HLS player.



## Installation



We are still working on the installation process. For now, you can install it by cloning the repository and running separately the components (see "Running and tests" section).



## Contributing



Feel free to contribute to this project by opening issues or pull requests.