(Always prefer F-Droid build, when possible).
Ojo is a basic IP Camera surveillance wall. IP camera's RTSP streams are added via its url and shown in the classic tile configuration. The number of tiles is automatically choosen based on the number of configured cameras: a single camera goes full screen, adding more cameras the app switches to a grid view: 2x2, 3x3, 4x4 and so on. The maximum number of cameras is determined by the device's capabilities.
The stream decoding and rendering is demanded to VLC's library: without their effort this app wouldn't be possible. This app was specifically developed for F-Droid, as I couldn't find any open source RTSP vievers in the main repository.
Thanks to brenard for the new grid sizing method Thanks to davquar for the fullscreen compatibility fix on Android 11