Hi everyone,

I'm troubleshooting an NDI issue and have isolated it as much as I can before posting.

System
vMix 29.0.0.47 (Trial)
Lenovo Legion 5i Gen 10
Intel Core Ultra 7 255HX
NVIDIA RTX 5070 Laptop GPU
32GB RAM
Windows 11 Pro
Internal NVMe SSD
Netgear GS305EP Smart Managed PoE Switch
Camera
PTZOptics Studio 4K
Latest firmware installed
NDI enabled
Tested both Full NDI and NDI HX3
Symptoms

When using the PTZOptics camera as an NDI source in vMix, I consistently receive Source Drops, Render Drops, and Sync Issues.

Example results:

1080p30 NDI (RTX 5070)

79 Source Drops
32 Render Drops
20 Sync Issues

4K30 NDI

Even higher drop counts than 1080p
What I've Tested
GPU
Tested on NVIDIA RTX 5070
Tested on Intel integrated graphics
Issue occurs on both
Recording
Tested with recording enabled
Tested with recording disabled
Issue occurs in both scenarios
HDMI Comparison

Using the same PTZOptics camera via HDMI into a Magewell capture device:

1080p29.97 HDMI

0 Source Drops
0 Render Drops
0 Sync Issues

This appears completely stable.

NDI Studio Monitor

Viewed the PTZOptics NDI stream in NDI Studio Monitor for several minutes.

No visible stutters
No freezes
No reconnects
Stream appears stable
Network Adapter Tuning

Disabled:

Energy Efficient Ethernet
Green Ethernet
Power Saving features
Interrupt Moderation

This reduced Render Drops significantly but did not eliminate the problem.

Network
Ethernet link speed confirmed at 1.0 Gbps
PTZOptics connected through Netgear GS305EP switch
No other significant traffic on the network
Project Settings
Tested 1080p30
Tested 2160p30
Camera and project frame rates matched
Performance
CPU usage remains very low
GPU usage remains low
Render times generally between 2ms and 9ms
Question

Since:

HDMI from the same camera is perfect,
NDI Studio Monitor appears stable,
The issue occurs on both Intel and NVIDIA GPUs,
The issue occurs at both 1080p and 4K,

I'm trying to determine whether this points to:

A PTZOptics NDI implementation issue
NDI runtime/configuration issue
Network adapter/driver issue
Something specific to vMix's handling of this NDI source

Has anyone experienced similar behavior with PTZOptics Studio 4K cameras and NDI in vMix?

Any suggestions for additional diagnostics would be greatly appreciated.