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Oh brilliant. Thanks. Yes. This only tends to happen on larger files, 5gb mkvs or multi audio track deals etc. I was also concerned it’s just a pi4 bottleneck, but that’s fixable too with more hardware. Just need to figure out what to get.
I'd lean towards the pi being the problem, but you can test the network throughput with iperf, and would want to test the videos outside of Kodi on the pi, so you could also check top and see what the processing looks like.
If I remember my pi 4 hardware decoding specs correctly, I believe h.264, MPEG 2, and VC1, and some support for HEVC. If I had to guess, you may have some codecs that aren't handled by hardware acceleration, and instead just CPU.
My best rec would be to use either a dedicated stream box (like a fire stick, Nvidia shield, etc) which has better codec support, or pick up like a little Intel n100 based system, which will handle a drastically wider set of codecs with full acceleration support.
Right now I've got a Roku and a Google TV Chromecast, and I've been trying with various environments on an old Lenovo m910q so I can find my favorite fit of UI/distro. The Roku and Chromecast never stutter, and I don't do transcoding for inside the home. Works with 4K HDR HEVC no problem.
Edit: Autocorrect annoyances.
Thanks, really appreciate the thoughtful response. I have an intel n100 NUC actually on the network. It used to be the jellyfin machine but has shifted to other duties. I probably should have tried to throw that in and reconfigure things but I just went with the OSMC Vero box which should tick all the necessary hardware boxes to at least free that from being the problem. Bonus: I get to add the pi4 back to the homelab stack.
If it turns out to be a Pi bottleneck, you can just re-encode the videos with a lower quality and h.264 codec.