SLX On Air
Content format guide
Recommended settings. Content that matches them is used exactly as supplied and is guaranteed to display correctly. Anything else is converted first and may not render as intended.
Video
| File type | MP4 |
|---|---|
| Codec | H.264 (AVC), Main profile |
| Resolution | 1920 × 1080 landscape · 1080 × 1920 portrait |
| Frame rate | 30 fps (25 also fine) |
| Bitrate | 8–12 Mbps |
| Audio | AAC, up to 192 kbps |
| Colour | 8-bit |
| Max file size | 80 MB · up to 360 MB on Android |
| Length | No limit |
Over 80 MB: the Android app automatically splits the video into up to five parts, which play in order with no loss of quality — so up to 360 MB. Coming soon to iOS and the web console; until then, keep files under 80 MB there.
Smaller files reach screens sooner. 1080p at the recommended bitrate is roughly 1 MB per second.
Images
| File type | JPG, PNG or WebP |
|---|---|
| Resolution | 1920 × 1080 HD · up to 3840 × 2160 for 4K |
| Orientation | Match the screen |
| Transparency | Preserved — use PNG or WebP |
| Max file size | 30 MB |
Images are delivered untouched — no resizing or re-compression. They are never enlarged, so anything below the screen’s resolution looks soft.
PDFs
| File type | |
|---|---|
| Pages shown | First 5 only |
| Page size | Match the screen's orientation |
| Max file size | 30 MB |
Each page becomes a slide. Only the first five pages are shown — longer documents upload without warning and the rest never appear. Split them across separate posts.
Design for reading across a room, not in the hand. Password-protected PDFs show nothing. Transparency is flattened to white.
Time on screen
Images and PDF pages follow your board’s Slideshow Period. Videos play in full.
| Quick | about 8 seconds |
|---|---|
| Normal | about 16 seconds (default) |
| Long | about 24 seconds |
Orientation
Match content to the screen. Mismatched content is never cropped or stretched — the full frame is shown with a blurred surround, but appears smaller.
Avoid
- 4K video — reduced to 1080p. (4K images are used at full resolution.)
- 50 or 60 fps — converted to 30 fps.
- HEVC/H.265, VP9, AV1, ProRes — converted. H.264 is used directly.