Show cameras on a screen plugged into the Hub

What you need

A screen plugged into the Hub machine. The wall software comes with every Hub package and starts when there is a screen and a wall to show. Wall in the rail shows the Hub's screen outputs under OUTPUTS, each ON or FREE.

• “No screen is plugged in”: connect a screen and the wall starts by itself.
• “This box cannot drive a screen”: this machine has no display output the Hub can use.

Build a wall and put it on the screen

1. 01Choose Wall in the rail.
2. 02Choose New wall. With no wall on the screen, use the one in the panel Nothing is on the television.
3. 03Under LAYOUT, choose a shape: 1, 1+2, 4, 1+2 big, pano, 1+3, 6, 1+5, 1+7, 9, 12 or 16.
4. 04Under CAMERAS, drag a camera onto a slot, or choose it to fill the next empty slot. Dropping a camera onto a filled slot replaces the camera there. To swap two tiles, drag one tile onto the other.
5. 05On a tile, the stream badge switches SUB and MAIN, the fit badge cycles fit, fill and stretch (a new tile starts on stretch), and the lens badge picks a lens on a two-lens camera. ✕ takes the camera off; choose it twice.
6. 06Check COST OF THIS DRAFT: tiles, camera sessions, and how many are main.
7. 07Choose Push. It can take a few seconds while the Hub measures each new picture. The page says “Pushed to <output> · the television changed”.

• A two-lens camera can go on the wall twice. The second tile gets its other lens.
• A main stream costs several times a sub. Tile 1 is the only tile worth a main stream on a 4K screen.
• A new wall always goes to the first output under OUTPUTS. Pushing it there takes any wall already on that screen off it, and keeps that wall as a preset.

Change the wall

1. 01Choose Open the editor beside the wall.
2. 02The strip ON THE TELEVISION NOW shows what is on the screen.
3. 03Make changes. The panel headed NO CHANGES lists each change as you make it (1 CHANGE, 2 CHANGES and so on), and Push stays off until something differs.
4. 04Choose Push, or Revert to start over, or Cancel.

Saved arrangements

• In the editor, type a name under SAVE AS A PRESET and choose Save as a preset. It is kept with no screen.
• A preset's chip puts it on the first screen in one click, and the wall that was there is kept as a preset. The small wall button beside a chip opens it in the editor, where Save keeps your changes.
• Take down asks first, then keeps the wall as a preset with no screen.

What the screen shows

• Each tile shows the camera's picture and, centred at the bottom, its address and name.
• A red dot left of that label means the camera's footage is reaching the disk now.
• A red border means the camera reports motion.
• An amber border and RECONNECTING mean its picture has stopped and the Hub is trying again. A grey border and NO SIGNAL mean it is down. The tile keeps its last frame and its name.
• The date and time, and a network rate, are at the top centre.
• A Hub nobody has set up shows its setup code instead. A blocked Hub shows why it is blocked, and takes no wall changes: see When the Hub is blocked.

How many tiles

Every tile is one more video the Hub decodes. WHAT IT COSTS shows the Hub's starting figure for this class of box, as THIS CLASS OF BOX: N TILES: 4 on an unrecognised box, 8 on a Raspberry Pi 5, 16 on an Intel box. It is a guide, not a limit.

Find a slow camera

Under DIAGNOSTICS, turn on Debug overlay. Each tile then shows its frame rate, queue and delay. The screen restarts for a second when you switch it on or off.