https://www.instagram.com/p/DO...

This Sunday (14/09/2025) we will be performing a new dance show in Cologne, Oulu and online. Mycelial Threads has been made using Izzycast to link studios in Finland and Germany. I've made telemetric performances before, using VDO.ninja and OBS, or screen-capturing AV feeds into Isadora and using Syphon Virtual Webcam to get the results out to other venues via Zoom or ninja. But this time, all that is being handled by Izzycast, which has kept the workflow simple and stable, and enabled me to do more complex routing with video and audio - with the added benefit of data transfer, so I can switch between cameras and send lighting cues in the other studio.

If you are in Cologne or Oulu, please come and see the show in person, but if you are elsewhere, you can catch it at taikabox.com

More details, show times and link to the livestream at: https://taikabox.com/mycelial-...

@gaspar

with this setup, i get the same results as you, even with nothing initialised, the trigger is sent when entering the scene

@dbini @DusX @Woland 

Thanks for coming back to me...

The I/O user actor was basically meant to send triggers, but not necessarily when entering the scene.

The input and outputs were not initialised, although I tried to initialise them to zero after seeing this weird behaviour.

From your answers I assume it does not happen on your system.

I even created a blank patch from scratch with a first blank scene and a second scene with only the I/O user actor and a trigger value to check if it is triggered when entering the scene... and YES IT IS.

And this happens also on my second installation of ISADORA on the same computer but DUAL BOOT for just gigs... no internet, no antivirus, etc.

@gaspar
are any of the inputs initialised? Either inside the User Actor, or on the outside?

anybody has recommendations to rent a 3d scanner in Berlin? Or is willing to rent one? 

Thanks!

Alessandra 

@gaspar

It'll definitely trigger if you set the User Output actor inside the User Actor to initialize as blank or at a certain value (depending on data type), but in that case it's just pushing the data that you told it to initialize with.

@mark_m

sorry late night blindness. Of course they do this as they have network connections.

Rest API's are easy - you might even be able to do this with the TCP actors but it for sure trivial in python.

Dump the API info and the Isadora pythoner documentation into chatGPT and it should get you going very quickly.

@fred

Hi Fred,

Thanks, yes, I didn't know about the Arduino shield possibility, but if you read my original post you can see that it is  also possible to control some Blackmagic Cameras over ethernet via Blackmagic's REST API.

Therefore you can have exactly the same control of your BM camera as you would with an ATEM without the need for an ATEM. Currently you can do this via a web interface and ethernet. What I wanted to know was whether it was possible to control from within Isadora using the REST API.  And apparently it is.

Advantages of connecting your camera via Ethernet means that you could, for example, record from your camera onto an SSD in full resolution and then copy that recording over the network to a local computer. Meaning you could put the camera in inaccessible places and still access your recordings. 

All the best

Mark (Not...)

@mark_m Blackmagic camera controls are sent over auxiliary information paths inside the SDI (and apparently HDMI) signal. The ATEM switchers output the camera commands on some (not all - usually not down converted) outputs. To send camera control you need to embed the control signal in the video signal- there are few options to do this:

1. Use an ATEM switcher to encode the commands into the SDI feed and control the ATEM switcher somehow (you take an SDI output from the ATEM and plug it into the SDI in of the camera - no length limitations like HDMI).

2. Use a reverse engineered protocol and some fancy hardware that lets you mess with the AUX data feeds.

3. Use Blackmagic's Arduino SDI shield that has the camera control protocol published- this was you can send and receive the camera controls with an Arduino and control that however you like without the need for an ATEM switcher. The Arduino shield is here: https://www.blackmagicdesign.c...

@armando said:

consumer standard hdmi cable

 And this is the problem: with the HDMI cable you are limited in distance from ATEM to Camera. 
I know all this, @Armando, and I have also controlled the camera with an ATEM TV Studio HD which has SDI - so you need two SDI cables but you can us long distances.
If you look on YouTube you will see that people have used the REST API to control a BMMSC4KG2 camera wirelessly, by attaching the BMMSC4KG2 camera to USB -> ethernet adapter -> ethernet cable -> portable access point which joins the network sending the REST API commands, and sent the picture wirelessly using Hollyland 4K transmitter. So that distance is no object AND you don't need an ATEM.