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A capture card is a device that takes a video signal — from a camera, games console, DSLR, AV switcher, or any other source — and converts it into a format a computer can receive and record or stream. Without a capture card, professional cameras cannot connect to OBS, Zoom, Teams, or any other software.

You need a capture card if:

• You want to use a DSLR, mirrorless or broadcast camera as a webcam in Zoom or Teams
• You want to record or stream gameplay from PlayStation 5, Xbox Series X or Nintendo Switch
• You want to record video from a camera into OBS, vMix or Wirecast
• You are capturing medical, surgical or scientific video into a computer
• You are recording lectures, presentations or training sessions into Panopto or Kaltura

You do not need a capture card if:

• Your camera connects directly via USB (most modern webcams, some mirrorless cameras in webcam mode)
• You only want to stream from a standalone encoder directly to the internet without a computer

A capture card connects to a host computer via USB or PCIe. It makes your camera's video available as a source in software like OBS, Zoom, vMix or Panopto running on that computer. The computer does all the processing, encoding and streaming work. If there is no computer, the capture card does nothing.

A standalone encoder is a self-contained device. It connects to your camera via HDMI or SDI, connects to your internet router via Ethernet, and streams directly to YouTube, Facebook, SRT or any RTMP destination without any computer involved. You set it up once via a web browser, then unplug the laptop — the encoder runs automatically every time it is powered on.

Choose a capture card when: You want to record or edit the footage, use it in streaming software, mix it with other sources, or use it as a webcam in conferencing software.

Choose a standalone encoder when: You want to stream live from a fixed location reliably, without a computer in the signal chain. Common in churches, classrooms, sports venues and boardrooms.

USB capture cards are external devices that plug into any computer's USB port. They work on laptops, desktops, Macs and Windows PCs without opening the machine. No installation required beyond plugging in. This is the right choice for most users, especially those who move between locations or want to add capture to an existing machine.

PCIe capture cards install inside a desktop PC or workstation in a PCIe expansion slot. They typically offer higher throughput and are designed for 24/7 operation in permanent installations — broadcast workstations, surveillance systems, server-based recording. They cannot be used with laptops.

M.2 capture cards install in the M.2 slot found on many motherboards — the same slot used for NVMe SSDs. They are ideal for small-form-factor PCs, embedded systems and industrial computers where there is no room for a PCIe card but an M.2 slot is available. Also used in servers with M.2 expansion.

The simplest and most reliable way for a church to stream services live is with a standalone hardware encoder. This is a small box that connects directly to your camera's HDMI output and your internet router, then streams to YouTube Live, Facebook Live or any other RTMP destination — completely independently, with no PC required.

What you need:

• A camera with HDMI output (any camcorder, DSLR, PTZ camera or even a DVD player with HDMI output works)
• A standalone hardware encoder
• An Ethernet cable connected to your church's internet router
• A YouTube or Facebook account with live streaming enabled

Setup process:

1. Connect the camera's HDMI cable to the encoder's HDMI input
2. Connect an Ethernet cable from the encoder to your router
3. Power on the encoder — it will get an IP address automatically
4. Open a web browser on any computer or tablet and type the encoder's IP address
5. Enter your YouTube or Facebook stream key in the encoder's web interface
6. Click Start — the encoder will go live immediately

Once configured, the encoder remembers all settings. Next Sunday, simply turn it on and it starts streaming automatically. No laptop, no technician, no complexity.

SRT (Secure Reliable Transport) is an open-source streaming protocol designed to deliver high-quality video over unpredictable internet connections. Unlike RTMP — which was designed for controlled networks — SRT automatically recovers from packet loss, adapts to variable bandwidth and encrypts the stream in transit.

Use SRT when:

• You are streaming from a remote location over a 4G/5G connection or unreliable broadband
• You need low-latency contribution feeds from field reporters or remote cameras into a production system
• You are delivering premium streams that require encryption and cannot afford dropped frames
• You are connecting to a media server, CDN or distribution platform that supports SRT ingest

Stick with RTMP when: Streaming to YouTube, Facebook or Twitch from a reliable connection — these platforms still primarily use RTMP for their public ingest endpoints, though some (including YouTube) are beginning to support SRT.

Going live on YouTube requires two things: a stream key from YouTube and a device or software that sends a video signal to that key. Here is the complete process.

Step 1 — Enable live streaming on your YouTube account. Go to YouTube Studio, click Create → Go Live. First-time users need to verify their account — this can take up to 24 hours, so do not leave it until the day of your event.

Step 2 — Get your stream key. In YouTube Studio, go to Go Live → Stream. Under Stream settings, find your Stream Key. Copy it — you will need to paste this into your encoder or OBS.

Step 3 — Configure your streaming device.

• Using OBS: Settings → Stream → Service: YouTube, paste your stream key
• Using a hardware encoder: Open the encoder's web interface, paste the stream key into the RTMP URL field alongside YouTube's server URL (rtmp://a.rtmp.youtube.com/live2)

Recommended settings for YouTube: 1080p resolution, 4500–9000 Kbps bitrate, H.264 codec, 30fps or 60fps, AAC audio at 128Kbps or 320Kbps.

Games consoles output video via HDMI. A USB capture card takes that HDMI signal and makes it available as a video source on your PC — so you can record in OBS, stream on Twitch or YouTube, or create content for social media.

Basic setup:

1. Connect the console's HDMI cable to the capture card's HDMI input
2. Connect a second HDMI cable from the capture card's loop-through output to your TV (so you can still see the game while you stream)
3. Connect the capture card to your PC via USB
4. Open OBS — the capture card will appear as a Video Capture Device source
5. Add it to your scene and you will see the game in OBS, ready to stream or record

Medical video capture is used for surgical recording, endoscopy documentation, telemedicine consultations, pathology imaging and hospital-wide video distribution. The key challenge in NHS and healthcare environments is that workstations are often locked down — drivers cannot be installed, and IT approval processes can take weeks or months.

The solution: UVC-compliant plug-and-play capture devices. UVC (USB Video Class) is a standard that allows video capture devices to appear as webcams to Windows, macOS and Linux without requiring any drivers or software installation. They work immediately on locked NHS workstations — plug in, and the device is recognised automatically.

Common medical applications:

• Surgical theatre recording for training, audit and legal documentation
• Endoscopy and laparoscopy video capture into medical record systems
• Telemedicine consultations with professional camera quality
• Pathology and microscopy imaging
• Hospital-wide CCTV and monitoring distribution over NDI
• Remote observation of procedures for training

Signal type in medical environments: Most medical imaging equipment, surgical cameras and laparoscopy towers output HDMI or SDI. Check the output socket on the equipment — HDMI is the flat trapezoidal connector; SDI is a round BNC connector.

HDMI is the flat, trapezoidal connector you see on TVs, monitors, laptops and consumer cameras. It carries both video and audio in a single cable. HDMI is the dominant standard for consumer and prosumer equipment — DSLRs, mirrorless cameras, camcorders, games consoles, laptops and presentation systems all use HDMI. Standard HDMI cables are reliable up to about 5–10 metres; beyond that, signal degradation becomes an issue without active cables or repeaters.

SDI (Serial Digital Interface) is the round BNC connector used on professional broadcast cameras, ENG cameras, studio cameras, surgical cameras and broadcast infrastructure. SDI was designed for long cable runs — 100 metres or more on standard coaxial cable — making it the standard for fixed broadcast installations. SDI is found in broadcast studios, OB trucks, sports venues and anywhere cable runs are long or the environment is electrically noisy.

Quick identification:

• Flat trapezoid connector — HDMI
• Round connector with threaded ring (BNC) — SDI
• Multiple thin round connectors — composite or component (older, analogue)

If you have a consumer camera, DSLR, games console or laptop — you have HDMI. If you have a professional broadcast camera, ENG camera or studio camera — you likely have SDI. Many professional cameras have both.

4K (Ultra HD) is 3840×2160 pixels — four times the resolution of 1080p Full HD. It produces noticeably sharper video but requires more powerful hardware to process and more bandwidth to stream.

You genuinely need 4K capture when:

• Your camera outputs a 4K signal and you want to preserve full quality for post-production editing
• You are producing content that will be viewed on large 4K displays where the extra resolution is visible
• You need to punch in and crop on footage without losing quality
• You are working in medical imaging where every pixel of detail matters

1080p is usually sufficient when:

• Streaming live — most streaming platforms cap at 1080p60 for standard streams
• Video conferencing — Teams and Zoom cap at 1080p
• Your viewers are on phones or standard HD monitors
• Your computer is not powerful enough to encode 4K in real time without dropped frames

OBS Studio is free and works with virtually any capture card. Here is how to add your capture card as a video source.

1. Connect your capture card to your computer via USB and connect your camera or source to the capture card's input
2. Open OBS Studio. If you do not have it, download it free from obsproject.com
3. In the Sources panel at the bottom, click the + button
4. Select Video Capture Device from the list
5. Give it a name (e.g. "Camera" or "Capture Card") and click OK
6. In the Device dropdown, select your capture card by name
7. Set Resolution to match your camera output — usually 1920×1080
8. Set Frame Rate to match your camera — usually 25fps (PAL) or 30fps (NTSC)
9. Click OK — your camera feed should appear in the OBS preview

To add audio from the capture card: In Settings → Audio, add the capture card as an Audio Input Capture source. Alternatively, it often appears automatically in the Audio Mixer panel once the video source is added.

A USB capture card makes any camera with HDMI output appear as a standard webcam in Zoom, Microsoft Teams, Google Meet, Webex and every other video conferencing platform. No drivers or special software required — the capture card is UVC-compliant, which means it works like a plug-and-play webcam.

1. Connect your camera's HDMI output to the capture card's HDMI input
2. Connect the capture card to your laptop or PC via USB
3. Open Zoom (or Teams, Meet, etc.)
4. In Settings → Video, change the Camera dropdown to your capture card name
5. Your professional camera feed will immediately replace the webcam

Camera settings to check: Make sure your camera is set to output a clean HDMI signal — disable overlays, menus and battery indicators from appearing on the HDMI output. On most cameras this is in the HDMI settings menu, labelled "Clean HDMI" or "Output Display".

NDI (Network Device Interface) is a royalty-free protocol developed by NewTek that allows high-quality, low-latency video to be sent over standard Ethernet networks. Instead of running HDMI or SDI cables between rooms and buildings, NDI encodes the video signal and sends it as IP data packets over your existing network infrastructure.

How NDI works in practice:

• A camera or other video source is connected to an NDI encoder (or uses a built-in NDI output if it is an NDI-native camera)
• The encoder converts the video to NDI and sends it over your Ethernet network
• Any device on the same network — a computer running OBS or vMix, an NDI decoder connected to a display, or another camera system — can receive the NDI stream
• Multiple devices can receive the same NDI stream simultaneously

NDI is the right choice when:

• You need to send video between rooms, floors or buildings without long cable runs
• You want multiple destinations to receive the same video source simultaneously
• You are building a scalable IP video infrastructure across a campus, hospital or multi-room facility
• You want to receive video from remote cameras into production software like OBS or vMix over a local network

NDI does not replace the internet — it works on local networks. NDI is designed for low-latency delivery within a building or campus network. For contribution over the public internet, use SRT instead.

Distributing video around a building traditionally required long HDMI or SDI cable runs — expensive to install, unreliable over distance and inflexible to change. IP video distribution using NDI over existing Ethernet infrastructure is the modern solution.

Basic IP distribution setup:

1. At the camera location, connect an NDI encoder to the camera's HDMI or SDI output and to an Ethernet port
2. The encoder is PoE (Power over Ethernet) — it receives power through the Ethernet cable, so no separate power supply is needed
3. At the destination display, connect an NDI decoder to the display's HDMI input and to an Ethernet port
4. Configure the decoder to receive the specific NDI stream from the encoder — done via web browser
5. Video now flows from the camera to the display over your Ethernet network

The same NDI stream can be received by multiple decoders simultaneously — so one camera can feed multiple displays in different rooms without any additional equipment.

Educational institutions use professional video hardware across a wide range of applications — from single-room lecture capture to campus-wide IP video networks. The right solution depends on the scale, the software platform and whether a PC is available at each capture location.

Single-room lecture capture: A USB capture card connects a HDMI camera or presentation switcher to the room's PC, making the video available in Panopto, Kaltura, Echo360 or any other lecture capture software. The room PC does the recording and uploading automatically.

PC-free lecture capture: A standalone encoder in the lecture room captures the camera output and streams or records without any PC involvement. The recording uploads to the platform over the network automatically after the lecture ends.

Campus-wide video distribution: NDI encoders at camera locations across campus distribute video over the institution's existing Ethernet network to lecture theatres, study spaces and streaming systems simultaneously — without installing any dedicated AV cabling.

Remote and hybrid teaching: USB capture cards enable teaching staff to connect professional cameras to their computers for high-quality delivery on Zoom, Teams or Webex — significantly improving the experience for remote students compared to laptop webcams.

NDI network design for commercial installations requires careful consideration of bandwidth, network infrastructure and device management. This guide covers the key planning considerations for AV integrators.

Bandwidth planning: NDI streams typically use 100–200Mbps per stream depending on resolution and frame rate. For a 10-camera installation with all streams potentially active simultaneously, you need 1–2Gbps of network capacity. Plan for redundancy and headroom — specify 10Gbps uplinks between switches for multi-camera environments.

Network infrastructure requirements:

• Gigabit Ethernet minimum — 10Gbps recommended for installations above 5 streams
• Managed switches with multicast support (IGMP snooping) to control NDI traffic distribution
• PoE+ switches for powering encoder and decoder units (typically 25W per device)
• Dedicated VLAN for video traffic to isolate NDI from general IT network traffic
• QoS (Quality of Service) configured to prioritise video packets

Device management at scale: For installations above 10 devices, use a centralised management approach. PoE-powered NDI encoders and decoders are browser-managed individually, but at scale a management tool or API integration simplifies configuration, monitoring and fault diagnosis.

A black screen in OBS or Zoom when a capture card is connected is almost always one of these causes:

1. HDCP copy protection (most common — games consoles)
PlayStation 5 and some other devices enable HDCP by default. Disable it: PS5 Settings → System → HDMI → Enable HDCP → Off.

2. Wrong source selected in OBS
In OBS, right-click the Video Capture Device source → Properties → confirm the correct device is selected in the Device dropdown.

3. Camera not outputting a signal
Check the camera is on, in record or standby mode (not playback mode), and the HDMI output is enabled. On some cameras, HDMI output only activates when a cable is connected before the camera is turned on.

4. Wrong resolution or frame rate
In OBS Video Capture Device properties, try setting Resolution to "Device Default" rather than specifying a resolution manually. If your camera outputs 25fps (PAL) and OBS is expecting 30fps (NTSC), this can cause issues.

5. USB power issue
Some USB capture cards require a powered USB port. Try connecting to a different USB port, or use a powered USB hub. Avoid USB extension cables — they can drop voltage.

6. Driver conflict
If the device was previously installed with different drivers, conflicts can occur. Open Device Manager, uninstall the capture device entry completely, unplug and replug, and let Windows reinstall it fresh.

1. Check that audio is embedded in the HDMI signal
HDMI carries both video and audio. If your camera or source is set to output audio via a separate analogue output instead of embedding it in HDMI, the capture card will receive no audio. Check the camera's audio output settings.

2. In OBS — check the Audio Mixer panel
The capture card should appear as a separate audio source in the Audio Mixer at the bottom of OBS. If the meter is not moving, the audio is not being received. If it is moving but you cannot hear it, check the monitor settings — the audio may be being captured but not monitored.

3. In Zoom / Teams — check the microphone setting
In Zoom Settings → Audio → Microphone, change the input device to your capture card. The card carries both video and audio — selecting it as the microphone gives you the embedded audio from your camera.

4. Windows audio routing
Go to Windows Settings → Sound → Input and ensure the capture card is listed. If it is not, the driver may not have installed correctly. Unplug and replug the device.

Dropped frames and lag in streaming have three main categories of cause: encoding performance, network bandwidth and capture card throughput.

Encoding performance (PC too slow):
If OBS is dropping frames, the PC cannot encode fast enough. Solutions: lower the output resolution (try 720p if you are struggling with 1080p), reduce the bitrate, switch encoding from software (x264) to hardware (NVENC for Nvidia or QuickSync for Intel), or close other applications consuming CPU/GPU.

Network bandwidth (internet too slow):
OBS shows "dropped frames due to network" if your upload speed cannot sustain the streaming bitrate. For 1080p streaming, you need at least 6–8Mbps stable upload. Run a speed test (fast.com) — if your upload is below 10Mbps, reduce the streaming bitrate. Always use a wired Ethernet connection for streaming — WiFi is unreliable for sustained upload.

USB bandwidth (capture card throughput):
USB 3.0 capture cards require a USB 3.0 (blue) port. Connecting to a USB 2.0 port will cause severe frame drops or no signal. Ensure the cable and port are USB 3.0. Avoid USB hubs — connect the capture card directly to the computer.