AJA UDC-4K Mini-Converter

AJA UDC-4K is the kind of converter you keep in the kit because it solves the annoying problems that show up five minutes before doors. It is a rugged 4K/UHD up, down, and cross-converter that also covers the two things that usually force a second box: frame sync for wild sources and a 1x4 12G-SDI distribution amp when you suddenly need more outputs.

In practice, UDC-4K is your format normalizer. Feed it SDI or HDMI, pick the format you need, lock it to reference, and move on. The front panel and LCD mean you can do this in a rack, on a DIT cart, or behind a monitor wall without dragging a laptop into the mess.

Highlights

• Up, down, and cross conversion: scales between 4K/UHD, 2K, and HD to align mixed sources
• Frame sync built in: aligns outputs to a supplied reference or locks to input when needed
• SDI and HDMI both ways: converts 12G-SDI to and from HDMI 2.0 up to 4Kp60
• 1x4 12G-SDI DA behavior: four 12G-SDI outputs can distribute a clean or processed signal
• HDR aware: supports HDR signaling management with SDI VPID and HDMI Infoframe pass-through and optional override

Quick Specs & Practical Uses

• Video I/O: 12G-SDI and HDMI 2.0 inputs, 4x 12G-SDI outputs, and 1x HDMI 2.0 output
• Loop outputs: includes SDI and HDMI loop outputs for pass-through or local confidence monitoring
• Frame rate utility conversion: simple add, drop, repeat conversion between 59.94 and 50/60 families.
• Processing quality: 12-bit processing with AJA multi-tap polyphase scaling and a motion adaptive deinterlacer
• Audio handling: HDMI embedded audio up to 8-channel 24-bit, SDI embedded audio up to 16-channel 24-bit
• Compressed audio pass-through: supports AC-3 and E-AC-3 pass-through, including DD+ Atmos (DD+ JOC)
• Audio delay: supports up to 100 frames of audio delay
• Genlock options: external reference, SDI input, HDMI input, or free run
• Use cases: OB trucks, live events, AV racks, DIT carts, monitor walls, video village, hybrid SDI and HDMI environments

Real-World Conversion Notes

The problem UDC-4K fixes is not resolution. It is a mismatch. A camera shows up in the wrong format, a laptop is doing something weird, the venue feed is untimed, or the display chain is HDMI only. UDC-4K gives you a clean output in the format your switcher, router, or distribution expects, and it can frame sync the mess so it behaves.

The “utility” frame rate conversion is exactly what it sounds like. It is not motion-compensated magic. It is a practical tool for converting between 59.94 and 50/60 families when you need it to work, right now.

Image Quality Notes

UDC-4K is built around 12-bit processing, a proper scaling algorithm, and a motion-adaptive deinterlacer. That matters when you are taking interlaced or oddball sources and trying to make them look acceptable on modern displays. It is the difference between “technically converted” and “looks fine on a show feed.”

Connectivity & Workflow

The four 12G-SDI outputs are not just a convenience. In the field, they reduce the number of extra DAs you have to carry and power. You can distribute a processed signal to multiple destinations, or keep a loop-through path for confidence monitoring and pass-through workflows.

HDR handling is also practical. UDC-4K is HDR aware and manages HDR signaling metadata on SDI and HDMI, so your monitoring chain is less likely to lie to you.

Control Apps

Configure it from the front panel using the LCD and buttons, or use AJA Mini-Config on macOS and Windows when you want faster setup and repeatable presets. This is important in real installs because you can still recover the box when a laptop is not available.

Why It Helps

On paper, conversion is simple. On show day, it is never simple. UDC-4K is useful because it combines conversion, scaling, frame sync, audio handling, and SDI distribution into one box that is fast to deploy and easy to verify. That saves time, reduces failure points, and keeps your rack from turning into a pile of single-purpose adapters.

What’s In The Box

Package contents vary by configuration. Refer to the What’s Included section for exact items.

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