Thunderbolt3/Thunderbolt4 Video Capture Box4CH Thunderbolt3 SDI Video Capture Box
Multi-channel SDI capture through a high-speed Thunderbolt This four-channel 3G-SDI Thunderbolt 3 capture box supports up to 1080p60 video and SDI embedded-audio capture across four inputs. Its 40 Gb/s Thunderbolt 3 interface supports daisy-chain expansion, while YUY2 output, DP expansion, hardware scaling, deinterlacing, and locking BNC connectivity make it ideal for broadcast production, multi-camera streaming, medical imaging, industrial vision, and professional integration.
Thunderbolt3 Video Capture Box
PROFESSIONAL 4K VIDEO CAPTURE
Four-Channel 3G-SDI Thunderbolt 3 External Capture Box
A four-channel external capture solution for broadcast production, multi-camera streaming, conference recording, medical imaging, and industrial vision. It provides four HD-SDI / 3G-SDI inputs with video capture up to 1080p60 and four channels of SDI embedded audio. Dual Thunderbolt 3 ports deliver a 40 Gb/s high-speed link with daisy-chain expansion, while one DP output extends display connectivity. YUY2, XRGB, and NV12 video formats, automatic format detection, hardware scaling, deinterlacing, standard APIs, and the HWS SDK support professional integration.
4 × 3G-SDI InputUp to 1080p60Thunderbolt 3 40 Gb/sDaisy ChainYUY2 / XRGB / NV124-Channel Audio
CORE ADVANTAGES
Four professional SDI sources over one Thunderbolt 3 link
Four SDI InputsFour BNC inputs support HD-SDI and 3G-SDI sources at resolutions up to 1080p60.
High-Speed Thunderbolt 3Two Thunderbolt 3 ports provide up to 40 Gb/s link bandwidth and daisy-chain connectivity.
Multi-Format Video OutputYUY2, XRGB, and NV12 output formats support professional preview, recording, encoding, AI vision, and image-processing workflows.
Four Embedded-Audio ChannelsCapture embedded audio from four SDI inputs at 48 kHz / 16-bit.
On-Board Video ProcessingAutomatic format detection, hardware scaling, and deinterlacing reduce host processing workload.
Standard APIs and SDKDirectShow, DirectSound, and HWS SDK simplify application and OEM system integration.
HIGH-SPEED EXTERNAL CAPTURE
Professional four-channel 1080p60 SDI Thunderbolt 3 capture platform
4 × SDI IN · 2 × Thunderbolt 3 · 1 × DP OUT
The compact metal enclosure integrates four locking BNC connectors for reliable connection to cameras, routers, medical equipment, and industrial video sources. Power, DP expansion, and dual Thunderbolt 3 ports on the opposite side support clean cabling in desktop, mobile-workstation, and fixed-installation environments.
4 × HD-SDI / 3G-SDI inputs
Video capture up to 1080p60
Dual Thunderbolt 3 ports with 40 Gb/s link and daisy-chain support
Four channels of SDI embedded audio at 48 kHz / 16-bit
PROFESSIONAL CAPTURE VALUE
Reliable long-distance links, multi-channel capture, and flexible expansion
Locking BNC connectivity suits professional production and fixed installations. A high-speed Thunderbolt 3 link carries four HD audio/video sources to the host, while DP expansion and daisy-chain capability connect displays or additional Thunderbolt devices.
Broadcast and Multi-Camera ProductionIngest multiple SDI cameras or program feeds for switching, streaming, and recording.
Medical and Industrial VisionReliable BNC connections, multi-format video output, and SDK support professional imaging systems.
High-Speed External DeploymentNo internal PCIe slot is required, making it suitable for Thunderbolt workstations and notebooks.
CONNECTION AND CAPTURE WORKFLOW
From four SDI sources to the capture application
01 · INPUTConnect SDI sourcesUse suitable coaxial cables to connect up to four HD-SDI or 3G-SDI devices.
02 · HOSTConnect Thunderbolt 3Use a suitable Thunderbolt 3 cable and configure the daisy chain when required.
03 · EXPANSIONConnect a DP displayAttach a display to the DP output when extended display connectivity is needed.
04 · SOFTWARESelect channels and formatsChoose the channels, resolution, and audio in capture, streaming, or SDK software.
CORE SPECIFICATIONS
Technical specifications
| Product Type | Four-Channel 3G-SDI Thunderbolt 3 External Capture Box |
| Host Interface | 2 × Thunderbolt 3, up to 40 Gb/s, daisy-chain support |
| Video Inputs | 4 × BNC / SDI inputs |
| SDI Standards | HD-SDI, 3G-SDI |
| Input Resolution | Up to 1080p60 and supported lower resolutions |
| Capture Resolution | Up to 1080p60 and supported lower resolutions |
| Video Output Format | YUY2, XRGB, NV12 |
| Video API | DirectShow |
| Audio Capture | 4 channels of SDI embedded audio |
| Audio Format | 48 kHz, 16-bit |
| Audio API | DirectSound |
| Expansion Output | 1 × DP expansion output |
| Video Processing | Automatic format detection, output scaling, and hardware deinterlacing |
| Windows | Windows 7 / 10; Windows Server 2008 R2 |
| Linux | Linux kernel 2.6.38 and later |
| macOS | Listed as supported; verify the released driver for specific OS versions |
| Compatible Software | OBS Studio and capture, streaming, or recording software using DirectShow |
| Development Support | HWS SDK and standard DirectShow development interface |
| Power / Consumption / Size | 20 V / 3.25 A power adapter; ≤5.0 W; 135 × 110 × 60 mm |
| Operating / Storage | Operating: 0–85°C; storage: -20–70°C; storage humidity: 5%–90% |
APPLICATIONS
For professional multi-channel SDI capture and integration
Broadcast ProductionMulti-Camera StreamingConference RecordingMedical ImagingIndustrial VisionVideo MonitoringRemote EducationOEM Integration
Specification note: Actual per-channel resolution, frame rate, and concurrent performance depend on the SDI sources, Thunderbolt host, cables, driver, and application settings. The source document lists both 160 × 111 × 39 mm and 135 × 110 × 60 mm; this page uses the 135 × 110 × 60 mm value from the specification table. Verify final dimensions against the shipping model.
