Help Please: GH5, ATOMOS, MixPre HDMI Timecode and Control

I'm hoping that our community might be able to solve this together.

I've received the same question 4 times this week alone: How do I get timecode and Record Start/Stop controls to work with the GH5, ATOMOS (Ninja V, Sumo, Shogun, etc.), and the MixPre (3, 6, 10T) via HDMI?

I was NOT able to get all of them working by routing and HDMI cable from the GH5 to the Sumo, and from the Sumo to the MixPre. However, I confirmed with the same cables that it works when you use just the GH5 and MixPre or just the GH5 and ATOMOS recorder.

One hypothesis is that an HDMI splitter might solve the problem: Route an HDMI cable from the GH5 to an HDMI splitter, and from there, one of the splitter outputs to the ATOMOS and the other output to from the splitter to the MixPre.

Has anyone had success with this?

If this works, there's still the problem of how to power the HDMI splitter as most of them require power. But I believe there are some which are USB powered so that might work.

Thanks if anyone has information on whether the HDMI splitter approach or any other approach works. I'll create another video if we are able to find a solution.

I know that this is a bit of a Frankenstein type of rig. I don't usually shoot this way but I used to and many others still do for various reasons.

Thanks!

Copyright 2019 - Curtis Judd

ATOMOS Ninja V ProRes and Avid Recorder: NAB 2018

ATOMOS makes HDMI/SDI recorders with very nice monitoring capabilities along with focus and HDR exposure tools. Up until NAB 2018, they've made 7" and 19" monitors. But now they've announced their first 5" monitor/recorder with the capabilities of their Inferno line of recorders (top of the 7" lineup) - Focus, exposure, high frame rate, and HDR tools as well as ProRes and Avid DNxXX recording. This makes shooting and editing faster and with high bitrate and high quality codecs that playback smoothly so you don't have transcode.

Now why would you want to use a recorder like this? Here's why I use them:

Gear covered and used to shoot this episode:

ATOMOS Ninja V 4K HDMI HDR Recorder Monitor (coming Q3 2018)

RODE Reporter Microphone

RODE iXLR Adapter (Record a dynamic XLR microphone to iPhone or iPad)

Panasonic GH5 - My favorite, small camera for handheld use with a great image stabilizer

Panasonic 12-35mm f/2.8 OIS Lens - incredibly versatile lens that is on the GH5S most of the time

Copyright 2018 by Curtis Judd 

Music - MzA by Cary Judd, used with permission.

ATOMOS SUMO Audio Features

The ATOMOS SUMO 19” monitor & recorder is a dream to work with on set from an imaging point of view. The ATOM HDR feature makes exposing log footage much easier, has all the focus and other exposure tools pros rely upon, and even has some pretty impressive audio features. In this episode, we look specifically at the audio features and assess whether the microphone and line level inputs work well enough to rely upon for your projects and jobs. We also take a look at how the timecode and monitoring features hold up.

Links to gear discussed and used to record this session:
ATOMOS SUMO 19 - this is the recorder version, not the monitor-only version

Tentacle Sync E Timecode Generator

Sound Devices 633 Audio Mixer & Recorder

Sennheiser MKH 8050 Super-cardioid Boom Microphone

Panasonic GH5S - My current favorite small camera

Panasonic 12-35mm f/2.8 OIS Lens - incredibly versatile lens that is on the GH5S most of the time

Copyright 2018 by Curtis Judd