Compare capture boards
The HDMI capture boards ESP-KVM reads, side by side: the bridge chip, the connector, whether a monitor can stay on the target, and which ESP32-P4 boards each one fits. Pick the ones you are choosing between. "Untested" means nobody has run ESP-KVM with it yet.
45 x 30 mmGeekworm C790 | 56 x 56 mmGeekworm C792 | 45 x 30 mmWaveshare HDMI to CSI Adapter | 63.1 x 20.3 mmM5Stack Add-on Display In | |
|---|---|---|---|---|
| Status | Tested | Untested | Tested | Tested |
| Bridge | Toshiba TC358743 | Toshiba TC358743, behind a GSV2001 splitter | Toshiba TC358743 | Lontium LT6911D |
| Input | HDMI | HDMI, up to 4K60; 4K is scaled down to 1080p at the same refresh rate | full-size HDMI | HDMI |
| HDMI out | no | pass-through (VIDEO-OUT), the same picture as the input | no | no |
| 15-pin ribbon | yes, on the front (1.0 mm, the Pi 4 kind); cable in the box | yes, on the front (1.0 mm, the Pi 4 kind); cable in the box | yes (1.0 mm, the Pi 4 kind); it also powers the board | no |
| 22-pin ribbon | yes, on the back (0.5 mm, the Pi 5 kind); cable in the box | yes, on the back (0.5 mm, the Pi 5 kind); cable in the box | no; the P4-ETH needs a 15-to-22-pin ribbon | no |
| 24-pin ribbon (M5Stack) | no | no | no | yes, M5Stack's own flat cable to the Unit PoE-P4 |
| Works with | 13 ESP32-P4 boards | 13 ESP32-P4 boards | 13 ESP32-P4 boards | only M5Stack: Unit PoE-P4, Unit PoE-P4X |
| HDMI-CEC | yes, tried with a Steam Deck, a Nintendo Switch and an Android TV box | - | same chip as the C790; not tried on this board | no; the line is wired to the chip, but its CEC is undocumented |
| HDMI audio | I2S on its own 5-pin connector; not captured yet | I2S on its own connector; not captured yet | - | no; the chip's audio pins are not connected |
| Power | - | its own 5 V input, cable in the box | - | - |
| Measured | 1080p H.264 at 22-24 fps on the Function EV, 1080p MJPEG at 20 fps on the P4-ETH; my own figures on this site are all with this board | - | 1080p H.264 at 23 fps on the WIFI6-POE-ETH | 720p MJPEG at 23 fps |
| microSD | - | - | - | yes |
