Very low fps when using OpenCV

Marie · July 11, 2024, 2:19am

Hi,

I bought the stellarHD (1000-1500m) 60FPS Global Shutter Subsea ROV/AUV USB with a Fish eye lens, in monochrome. As I am doing some AprilTag detection with it, I am using OpenCV to code. Unfortunately, when using OpenCV, I get an fps of 1. Even when I try to set it manually to 30.
But when I simply open a video frame with cheese, the video frame is clear and fluid.

Does anybody knows what could explian this very low fps with OpenCV and know how to solve this ?

Joseph_Ho · July 12, 2024, 10:13pm

Hi Marie,

Could you check the video format type you are selecting with OpenCV? You may have accidently used YUY2 format which is a RAW output with no compression at low fps. Make sure OpenCV is using MJPEG.

Thanks!

Kunal · July 13, 2024, 3:50am

Hi!
You might be in RAW mode, try using this opencv QuickStart guide we’ve developed!

github.com

DeepwaterExploration/OpenCV-Quickstart/blob/main/2_Custom_Framerate/python/main.py

import cv2
import time

# -- Camera Parameters --
# Camera Index
CAM_IDX = 0
# resolution
WIDTH = 1600
HEIGHT = 1200

# Set a desired custom framerate, by reading frames at a custom interval
# custom framerate must be less than the highest supported framerate of camera
CUSTOM_FRAMERATE = 10

# Hardware supported framerate of the camera. Highest for best results.
FRAMERATE = 60

# used to set the pixel format to MJPEG/MJPG mode.
MJPG = cv2.VideoWriter_fourcc(*'MJPG')

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