Herelink with Fatshark HDO

(Marc Dornan) #1

I was always planning to get one of these from Beta 2 batch and I see they were available now. They would be ideal for medium range HD FPV planes. I was literally about to press the BUY button when I thought I had better check if they had an HDMI out port – I thought how could they not! Professional videographers/photographers want this. DJI provides this most of their controllers (as an option) and as standard feature in their Smart Controller.

So now that I know they do not have said feature can someone from ProfiCNC explain a practical solution to get this working with Fatshark HDOs? I do have a mirroring dongle but I did not like this solution. It added more latency when I used it with a Parrot Disco. And it added clutter to my setup (as I needed a battery pack to power it) which defeats the purpose. I would still buy one but only if there was a practical solution to connect to HDOs.

I think it was a mistake to omit the HDMI port. To me that is a core Pro feature (even if I personally am using it for a hobby application). I am also a keen photographer and while I like my Mavic 2 I thought it would be nice to take a better camera aloft on my dormant Hexacopter.


HDMI our was not included on purpose. It’s not an omission, it’s a design decision.

HereLink is not designed for FPV, your eyes should be on your vehicle at all times.

As mentioned quite a few times, there are HDMI ground solutions in the works for professionals, but these do not involve having a dangerous cable impeding the operators controller.

While I appreciate that people can find alternative uses for HereLink, HereLink was designed as a professional ground station/controller/video link, not for FPV.

(Marc Dornan) #3

Fair enough. But my other use was for what you describe – I do prosumer AP and have several rigs that are essentially profession circa 2015/16 that have been replaced by a Mavic 2. I was wanting to hoist a bigger camera up again for still photography. Would want a better screen though so I will keep an eye on developments.

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No worries

(Marc Dornan) #5

Just a point – even though the Herelink is not designed as an FPV controller if a solution existed to make it work with Fatshark HDOs I suspect people would use for this purpose! I do like to globetrot with smaller FPV planes and Herelink seems the most plausible solution I have seen thus far for those of us using Ardupilot. So if anyone here has figured at a screen cast solution that has tolerable latency then I hope you do not mind if we share it here.

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USB to HDMI works…



(Marc Dornan) #8

Much appreciated. Any idea how much latency this adds?


I have personally never tried it, and can’t promise anything regarding it…


@Eric_Xie? Added latency?

(Marc Dornan) #11


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(THill) #12

I know it has been stated that there would be no hardware changes, but a usb type C instead of the micro B would the shiznit! Would be more robust, especially for digital video output. I’m loving the unit so far, but not digging using the fragile micro B for output.


Sorry, no C coming

(Marc Dornan) #14

Hi Todd,

How are you finding the video out thus far via USB? What total latency are you observing?


(Eric) #15

from what we can see, there is no latency. But, it should have a little bit.


Best way to measure latency, is to film a high resolution timer with the air module so it shows on the HereLink screen, then with another camera, take a photo of both screens… the photo will show the time on all screens… you should see three times.

That is your glass to glass latency

(THill) #17

Tried with a generic usb c to hdmi for samsung with micro B adapter, but doesn’t work. No ugreen models like one pictured found stateside. Just ordered older generic micro B to try. Really need to output stream to LiveU 4G, unless better solution.