So again that would tend to point me to something happening on the Synology side.
I don't know anything about the Synology and how it deals with video but I'd suppose that a recording could be saved fine and then some other issue/settings/limitation/whatever could come into play when asked to stream it. How are the video files saved on the Synology? Can you copy a file from it to try directly in some other media player? That would answer your question.
How are you capturing the video that you post here?
The videos I post are generally, as above, downloaded directly off the NAS. There is a timeline one can download from, or a repository of recordings in a separate folder which one can access to download there. And often any of these sources will produce great results. Other times, seemingly randomly, there will be tearing left and right.
@sebastiantombs , unfortunately I didn't have my dielectric grease on hand at the time, and rather than let the camera dangle as I f*'k around trying to get the CAT7 cable to fit with the guts of the camera wiring, my wife held the camera as I carefully modified the cable, and the cable closure. It was an awkward, and the camera became pretty heavy for her after 10-15 minutes so I did what I could which wasn't optimal. I split the piece that secures the cable ends (PoE to camera) down one side so it would flex to applow the larger CAT7 cable within, plugged in to the camera, then wrapped the heck out of it all in electrical tape. I knew CAT7 would be robust, particularly the outdoor rated type I bought, but I had no idea the headache I was in for until that moment when I tried to fit the 7 through the part on the camera which encapsulates and secures the 2 cable ends. That is where the sh!t show began lol. Not optimal by any means, but my gut says it's ok. It's the NAS. Remember, the camera can be streaming and doing what it normally does, yet I can log into it and review edge recordings perfectly .. recordings which are coming through that same cable, like everything else. Which to me, points back to the NAS as some sort of bottleneck.
*It might be good if I reboot this laptop as well. It's probably been over a month since I did so, and memory is using 13GB swap right now so even this laptop may be suspect right now. *I was looking at an email reply from a friend just now, and we were referencing something in a security video I 'd sent. When I scrolled down a minute ago to review the video I'd sent it played ok the first time, and then subsequent play attempts were whack, and it would freeze and skip etc. Time for a reboot...after which I will try everything again, edge, NAS, and even try logging into the NAS from windows on this MAC. So far, where IE is concerned, I cannot access the NAS. It freezes after I try and log in. Perhaps the NAS recognizes the weathered old IE browser, and says nope. But I did acknowledge the page as not being secure etc, and proceeded yet still it locks up.