Home Assistant addon with substreams?

Hi,

I've got a Shinobi setup with 4 cameras and they're all working fine. I've also got a Home Assistant setup, and with the Home Assistant addon I can see the cameras there. Works great!

But - if I add a substream, use HWAccel, or try to use object detection in Shinobi, the feeds sent to Home Assistant turn into a blank beige screen, no video.

Is there a setting I'm missing? As soon as I turn off the [whatever] the Home Assistant feeds come back, but two of the cameras don't have built-in object detection or ONVIF so I'd like to use object detection in Shinobi to trigger recordings.

Thanks!