Blackmagic Design Hyperdeck
The HyperDeck Studio 4K Pro has full 12G-SDI with a loop 12G-SDI output. The two SDI outputs are both 12G-SDI so you can play ProRes 4444 files for true Ultra HD fill and key out. The HDMI connections and the ProRes and DNx file formats all switch between SD, HD and Ultra HD television standards. H.264 is included for SD and HD, but then switches to H.265 when recording in Ultra HD.
This powerhouse of a video recorder can handle anything signal connected to it. The external timecode in and out allow camera ISOs to be synced across multiple devices (cameras, audio recorders etc).
Also Available: UltraSync One wireless timecode generator.