Weaker detections in deepstream-app

I ran inference on the same video using my yolov5l .pt weights using detect.py from yolov5 github repo and onnx weights in deepstream.

This is the detect.py video

This is the video in deepstream with config:

nms-iou-threshold=0.45
pre-cluster-threshold=0.25
topk=300

and this is the video with config:

nms-iou-threshold=0.65
pre-cluster-threshold=0.001
topk=300

The detections are missing for most of the second half of the video in deepstream, what could be causing this and how can i solve it?

marcoslucianops / DeepStream-Yolo