Hey Bart,
I have 2 x Hikvision and 6 x Dahua cameras all integrated into HA, mainly via the Synology integration but I’ve also added them again using the generic platform. I’ve utilised all three streams on the HIK’s as you need a H.264 stream for casting and maybe for HH too? I’ve then taken my main Synology Surveillance Station cameras and created proxy cameras @ 720p and 2fps which I use for my three tablets.
I use the proxy cameras in HH and they work fine as do the generic cameras and the same cameras being feed by the Synology SS. So all three variants of the same camera feed work in HH. I’m happy to discuss in-depth if you want to take this offline via Skype or messenger. Message me.
P.S I’ve had no joy integrating cameras into HA with ONVIF.