Product Overview The Blackmagic Design Web Presenter 4K is a compact SDI streaming encoder that takes any SDI source up to UHD 4K and streams it live to the internet over Ethernet or a tethered 5G/4G phone. Supporting the H.264 codec and RTMP, this 4K SDI streaming encoder also works as a USB webcam for platforms like Zoom, Teams, YouTube Live, and Twitch, and includes SDI/HDMI monitor outputs with detailed technical status. Product Description The Web Presenter 4K accepts a single multi-rate 12G/6G/3G/HD-SDI input up to UHD 4K and encodes H.264 for RTMP streaming, with one simultaneous stream. It streams over its 10/100/1000 Ethernet port or by tethering a 5G/4G smartphone over USB for mobile data. The USB-C connector doubles as a webcam output, so a connected computer sees the feed as a standard webcam in any streaming or conferencing software on macOS, Windows, Linux, or Chrome OS, with 4K over USB-C where the software supports it. When streaming in HD it downconverts 4K input; when streaming 4K it passes 4K and upscales HD. As an SDI to RTMP streaming encoder, it provides an SDI loop output to pass the original feed to a switcher or router, plus SDI and HDMI monitor outputs that display a graphics-rich status view — on-air indicator, audio meters with selectable ballistics, codec data-rate and cache trend graphs, a 6-second video/audio history, and detailed SDI input information. A front LCD shows basic status. Dual redundant power (mains AC plus 4-pin XLR DC) supports critical broadcasts, and the unit fits an optional 1RU rack shelf. It is also compatible with the Blackmagic ATEM Streaming Bridge, which decodes the stream back to SDI or HDMI for additional routing. Key Features SDI input up to 4K — Accepts 12G/6G/3G/HD-SDI sources up to UHD 4K. H.264 / RTMP streaming — Streams to the internet over Ethernet or a tethered 5G/4G phone. USB-C webcam output — Appears as a webcam to streaming and conferencing software, up to 4K. Built-in technical monitoring — SDI/HDMI status output with meters, trend graphs, and history. SDI loop output — Passes the original feed to a switcher or router. Redundant power — Mains AC plus 4-pin XLR DC input for failover. Cross-platform — Works with Mac, Windows, Linux, and Chromebook. ATEM Streaming Bridge compatible — Decodes the stream back to SDI/HDMI for routing. Typical Applications Broadcast studio — Stream a finished SDI program feed to the internet with technical monitoring. House of worship — Stream services from an SDI switcher output, with phone-tether backup. Auditorium — Add reliable 4K internet streaming to a live-event SDI signal chain. Conference room — Present an SDI source as a 4K webcam for conferencing platforms. Technical Specifications Model BDLKWEBPTR4K Encoding H.264; UHD 4K down to 720p; 1 simultaneous stream; RTMP Video I/O 1× 12G/6G/3G/HD-SDI in, 1× SDI loop, 1× SDI monitor, 1× HDMI monitor, 1× USB-C Network / Mobile 1× RJ45 10/100/1000 Ethernet; USB 5G/4G phone tethering Audio SDI embedded (de-embedded for monitoring) Display Front LCD; graphics status on SDI/HDMI outputs Power NEMA 5-15R AC + 4-pin XLR 12 VDC (redundant), 25 W Rackmount 1 RU (1/3-rack) with optional shelf Dimensions 6.9 × 5.51 × 1.75" / 17.5 × 14 × 4.45 cm Weight 1.66 lb / 0.75 kg Frequently Asked Questions Do I need a computer or streaming software?No. The Web Presenter 4K encodes in hardware and streams over Ethernet via RTMP on its own; a tethered phone can supply mobile data. What input does it take?One multi-rate SDI input (12G/6G/3G/HD-SDI) up to UHD 4K, with an SDI loop output to pass the feed onward. Can it be used as a webcam?Yes. The USB-C output presents the feed as a webcam to software on Mac, Windows, Linux, and Chrome OS, up to 4K where supported. Is there power redundancy?Yes. It has both a mains AC input and a 4-pin XLR DC input for failover.
