I’m not sure I understand. Does this mean it’s smooth when you stream from Jetson Nano → Monster laptop, but blocky with Jetson Nano → some other computer? If so, wouldn’t that imply the issue is with that other computer, rather than the code you’re using?
I don’t have access to a Jetson Nano, or an Nvidia GPU, but for what it’s worth I’ve just tried running the ArduSub OpenCV gstreamer example, as well as the alternative approach of just using gstreamer as a backend for OpenCV, and both ran smoothly.
Why have you changed this to a 35ms delay, instead of the 1ms delay in the example? That could be messing with things.