IPC color4k-t video stuttering

[f1restarter]

Starting a new thread on this topic as I have been briefly discussing this in a few other threads a while ago with some suggestions but with no conclusion.

My setup is:
BI server:
Dell Optiplex 3050, i5-6500/intel graphics 530 with 16gb ram, 500gb ssd only for OS, 3tb seagate surveillance disk for recordings (new, stored, alerts)
Win10 pro clean install, latest BI v5.

Network: tp-link omada enterprise poe+ switches interconnected with fiber sfp
Cameras on a isolated subnet/vlan.

Cameras: 1 IPC-Color4K-T, 1 5442 and 3 older hikvisions. Total 5 cameras

I have read the wikis on this site and did all the applicable optimizations/ "tweaks", including substreams for all my cameras and direct2disk recording. (continous+trigger)
All cameras are Constant bitrate, 15fps (both main and substreams) and i-frame set to 15.

My issue is that after I installed and set up my color-4k-t it is stuttering/pausing every second. This is when viewing live or recordings in Bi console or even UI3.
My other cameras are also behaving likewise when my ipc-color4k-t is enabled but not nearly as bad. If I disable the 4k-t, the other cameras are smooth.

-If I disable substreams on the 4k-t, everything is fine but I want to be able to keep that for obvious reasons.
-If I increase the i-frame interval to 30, the stuttering is every 2 seconds and so on.
-Videos exported to mp4 from blue iris is also perfectly smooth.
-I have tried factory defaulting the camera (3times, using IE)?and installing latest firmware with exact same result
-I have tried to reconfigure it from scratch in Blue iris and increased the buffer/cache to 40mb (can't remember the name, I am away from the server atm)

I don't believe this is network related, because if I view the 4k-T's full resolution RTSP stream directly in VLC player on same computer it is perfectly smooth. (VLC has a 1000ms buffer)

I have seen in other threads people are experiencing similar symptoms using 4k cameras but none of them seems to be resolved.

I am wondering if this could be a pc hardware issue? My BI server is usually running around only 10-12% cpu load and memory less than 30%.

My next step is to try BI with this camera on a more powerful computer...

For those of you that successfully run this specific camera with Blue Iris (1or more), what are your hardware specs?

 

[wittaj]

Are you running hardware acceleration? If so turn it off.

My 4K/Ts, yes plural, work just fine on a 4th gen CPU. Hardware acceleration is turned off globally and in each camera.

 

[f1restarter]

Yes, hardware acceleration turned off. I believe you gave me that tip on my last attempt
I also downloaded the latest graphics driver directly from Intel.

This is so strange.... Is your 4th gen cpu i5 or i7? My next attempt will be a i7-6700 I have laying around but that will be when I am home from work next week

 

[wittaj]

It is an i7

 

[f1restarter]

Update: Today I replaced the CPU in my BI box with a used i7-6700 that I previously bought from an online marketplace for a few bucks. Same generation, of course same LGA 1151 socket, and support for the same motherboard chipset.
It was a simple swap, I just had to enable hyperthreading in Dell bios and after a reboot, windows recognized my new CPU


My 4K-T was still "stuttering" every second when viewing live video or recordings in BI after the swap.
I then tried to enable Hardware encoding for the 4K-T only (regular Intel) and that seems to solve the problem. I had previously tried that and every possible other options with my original i5-6500 CPU, but hey! I now have almost perfectly smooth video from my 4K-T in Blue Iris!



I only enabled it for the particular camera, and not "globally" in BI: (I don't know the difference)


For anyone interested, here is the Intel HD 530 driver that showed up automatically in Win10 after the swap:



I did not have high hopes for this attempt, as the CPU benchmark for the i7-6700 is not very much higher than the i5-6500, but 6th gen i7 supports hyperthreading and 6th gen i5 do not.
The official BI website however recommends the use of i7 processors

Anyways, I am very happy with the outcome

 

[f1restarter]

Also my CPU usage with BI console open went down from about 12% to 7% with the new CPU