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Review: Blackmagic Design ATEM SDI Extreme ISO and ATEM Mini Extreme ISO

Blackmagic has set a new standard for an affordable and professional all-in-one HD video switcher, and the biggest consideration is which model fits your workflows.

Blackmagic now has eight different models of ATEM Mini and ATEM SDI all-in-one video switchers in the mini desktop form factor. Starting with the $295 ATEM Mini model that was first announced in September 2019 and all the way up to the $1,295 ATEM Mini Extreme ISO (Figure 1, below) and $1,495 ATEM SDI Extreme ISO (Figure 2, below Figure 1), there are so many options that one can be forgiven if they don’t know where to start when selecting the correct one for their workflow needs. I’m going to spend a bit of time talking about the entire line before focusing on the two Extreme ISO models.

Figure 1. The HDMI-only Blackmagic Design ATEM Mini Extreme ISO

Figure 2. The SDI-only Blackmagic Design ATEM SDI Extreme ISO

What Is an ATEM?

The ATEM family comprises the entire line of Blackmagic Design video switching products, which includes the ATEM Constellation, Television Studio, Production Studio, Mini, and SDI lines. In addition, the ATEM line also includes the ATEM Streaming Bridge, ATEM Advanced Panels, ATEM Camera Control Panel, and ATEM Talkback Converter.

The ATEM Mini and ATEM SDI Video Switchers

Having this many models has also made for confusing naming conventions. The original ATEM Mini line features HDMI inputs and outputs. Once that line was built out with five different models and 10 HDMI connectors on the two Extreme models, it felt to me like it had outgrown the term Mini. The newer SDI line dropped the term Mini altogether and features only three different models. I think if Blackmagic could have a redo on its model naming, it would have never used the term Mini and opted instead for HDMI on the Mini line to be more consistent with the SDI line.

Anytime you see the term ATEM Mini, it is an HDMI switcher, while ATEM SDI is an SDI switcher. The base models start with four video inputs, and the Extreme models have eight inputs.

The term Pro is for models with hardware streaming, multiview, and H.264 program recording on USB-C drives. ISO models add ISO recording of all of the video, audio, and graphics inputs. The Extreme models have all of the features of the Pro models but add a SuperSource multilayer processor.

To clarify, there are no HDMI outputs on the SDI models, including for the Aux outputs that can be programmed to display the preview, program, multiview, or loop-out of any of the inputs. If you plan on using an HDMI monitor with the ATEM SDI models, then you will need an SDI-to-HDMI converter. Blackmagic has a whole line of broadcast converters like the Micro Converter SDI to HDMI or Micro Converter BiDirectional SDI/HDMI (Figure 3, below) in both 3G and 12G flavors for HD or 4K workflows or the Teranex Mini line of converters.

Figure 3. The Blackmagic Design Micro Converter BiDirectional SDI/HDMI

The number of Aux outputs varies between the Mini and SDI lines on similar models. The Mini has a single HDMI output, and the Mini Extreme has two HDMI outputs. The SDI line has twice as many Aux outputs, with the SDI and SDI Pro ISO both having two and the SDI Extreme ISO having four. All models have at least one USB-C webcam program output, while the Extreme models have two USB-C outputs that can be used for external drive recording, webcam program out, connection to a computer for the Software Control panel, and cellphone tethering while streaming.

ATEM SDI Extreme ISO and ATEM Mini Extreme ISO

I’m going to start my overview on the rear input and output connection end of these switchers. Starting from the left side (when facing the rear of the switcher) is the locking power connector. The eight-input Extreme line requires 36 watts of power, which is twice as much as the 18 watts on the four-input models. The power supply connection is the same locking design, so if you have multiple models, like I do, you don’t want to mix them up (Figures 4 and 5, below).

Figure 4. The rear I/O panel of the ATEM Mini Extreme ISO


Figure 5. The rear I/O panel of the ATEM SDI Extreme ISO

In addition to the two USB ports and HDMI or SDI outputs and inputs that are found on the back of the unit, there is also an Ethernet port. Each video input has internal re-sync and a frame rate and format converter—which means you can mix and match resolutions and know that your source refresh is locked and won’t drift.

Do note that the SDI models are deeper units, as the male 3G SDI spigots stick out, while the female HDMI connectors do not. The 0.57" (or 14.4mm) difference isn’t significant except when you try to accessorize the SDI models with custom transport cases or 3D-printed stands that were designed for the HDMI models. I know this firsthand, as I have a beautiful SKB iSeries Case for ATEM Mini Extreme (model 3I-17066ATM), with a custom-cut PE foam interior that won’t fit the ATEM SDI Extreme ISO. In addition, HPRC has the AME-2500-01 case for the ATEM Mini Extreme, with pre-cut foam that also won’t fit the ATEM SDI Extreme ISO.

There are two 3.5mm stereo audio inputs on the rear of the switcher. I would have preferred a single mono XLR input in that space for my workflows with a soundboard, but in this small form factor, tough decisions with trade-offs have to be made, and some producers may prefer the four channels of 3.5mm audio inputs over a single balanced mono XLR input—or dare I suggest a pigtail with a pair of mini XLR inputs. Actually, let me take that one back—I don’t want a mini XLR pigtail connector. The eight-input Extreme models also have a stereo 3.5mm headphone output, a feature that’s missing from the four-input models. One really nice feature on the analog audio inputs is that you can add up to six frames of delay in case the video and audio sync is a few frames off.

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