Marshall VAC-23SHUC 4K HDMI/3G-SDI to USB 3.0 Converter - Encoder - Capture Device
4K HDMI to SDI Converter | Datavideo | Datavideo | Professional end-to-end solutions provider for your live video production.
12G/6G/3G/HD-SDI to HDMI 2.0 Converter with Audio Extractor (PRO-SDIHD2)
Blackmagic Quad SDI to HDMI 4K 2 - CONVMBSQUH4K2 - Mini Converter
Mini Converters – Tech Specs | Blackmagic Design
Blackmagic Design HDMI to SDI 4K Mini Converter w/ Pelican 1060 Micro Case | eBay
Amazon.com: 4K HDMI to SDI Converter, Support 4Kx2K/60Hz HDMI 2.0 Input and 3G-SDI/HD-SDI Output, One HDMI in Two SDI Out, Auto Format Detection & Audio Embedder : Electronics