DCS-930L mjpeg camera : snapshot ok but no video

This is an old but ok working ip camera with motion sensor detection.
I was able to integrate it into HA with as an mjpeg device and I get the static screenshot ok … but I cannot get to show the mjpeg video stream although accessing the camera directly I see it working flawlessly.

Is anybody working on this? I have a few of them, different models and firmware, they all act the same. I’m willing to provide any kind of usefull data to any developer who is interested in integrating them correctly into Hasso. I’d gladly spend some time on it if there’s any chance to get them acting properly inside HA.

Ok, I’m trying to find a solution by myself at the moment, although I’m quite new to HA.

I noticed an errors in Home Assistant Core log:
Cannot connect to https://192.168.0.43:1000/video/mjpg.cgi

Well IP, Port, and the rest of the URL is correct but … https is not! I did specify this URL in the camera setup instead:
image

So something inside HA is changing that (or does it expect it to be https without exeptions?) although my camera does not offer any MJPEG stream through https at all, of that I’m sure.

Even changing the port back to 80 in the camera and in the setup didn’t help.

image
Btw this is what it looks in preview, and inspecting the DOM the missing stream is somewhat related to /api/camera_proxy_stream/camera.camera3?token=.......

but I have really no idea where to look in order to find any kind of solution. Maybe someone more experienced with HA than me?