I checked the case notes for your new case opened today. I think the reasonable next step is to either A) allow Meraki Support access to your camera network for troubleshooting or B) do a webex with Support so they can further diagnose & troubleshoot.
What happens when you attempt to access video from a host not on the LAN? Meaning it depends on cloud proxy to stream video. Does it work then?
Also, what is the DNS server for the clients? An onsite/internal DNS? If you instead configure your client to use 8.8.8.8 just as a test does it change the behavior? There's an underlying DNS process that occurs when the browser attempts to retrieve video on the LAN that could be failing here.
Lastly, using dev tools in your browser can help point to what the underlying issue is. You can invoke the dev tools, attempt to access the video stream and see if any of the calls fail. You can also export that to a HAR file. We often use that when troubleshooting browser streaming issues.
I'll say I have tons of customers using thousands of our cameras across the globe. There's not any systemic issues I'm aware of. So I'm confident this is specific to something in your environment. My advice is keep working with Support and stand firm until they resolve it for you.
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