FPS change, a lot, depending on object distance from camera

Describe the bug FPS change, a lot, depending on object distance from the camera. In the following video, you can see how the picam2.capture_array() slowdown when I change the object distance from the camera. This does not happen with "libcamera-hello -t 0.

Screen capture of issue: https://youtu.be/-fcGAsdIHT4

To Reproduce The used code is:

#!/usr/bin/python3

import time

import cv2
import numpy as np
from picamera2 import Picamera2

picam2 = Picamera2()
main = {"format": 'RGB888', "size": (640, 480)}
raw = {"format": "SRGGB10_CSI2P", "size": (1332, 990)}
config = picam2.preview_configuration(main, raw=raw)
picam2.configure(config)
picam2.start()

frame_cnt = 0
frame_fps = 0
frame_info_show = False

tfps1 = time.perf_counter()
while True:
    try:
        try:
            frame = picam2.capture_array()
        except:
            frame = None
        if frame is None:
            print('image not ready!')
            continue
        cv2.imshow('frame', frame)
        cv2.waitKey(1)
        if frame_info_show:
            frame_info_show = False
            print('FPS = {:5.2f}'.format(frame_fps))
        frame_cnt += 1
        tfps2 = time.perf_counter()
        if (tfps2 - tfps1) > 1.0:
            tfps3 = time.perf_counter()
            frame_fps = frame_cnt / (tfps2-tfps1)
            frame_cnt = 1
            tfps1 = tfps3
            frame_info_show = True

    except Exception as e:
        print(e)

Hardware : I’m using the latest Picamera2 and raspberry libcamera version on RPi 4B with IMX447 (motorized but not managed yet).

qem@raspberrypi:~ $ uname -a
Linux raspberrypi 5.15.32-v8+ #1538 SMP PREEMPT Thu Mar 31 19:40:39 BST 2022 aarch64 GNU/Linux

qem@raspberrypi:~ $ libcamera-hello --version
libcamera-apps build: 0dc5ea038c79 04-03-2022 (10:35:09)
libcamera build: v0.0.0+3544-22656360

qem@raspberrypi:~ $ pip list | grep picamera2
picamera2         0.2.2

[Tim-Brown-NZ]

Hi, the problem is that the code above was written for an older version of the library and the thread has not been updated.
The preview_configuration method has been renamed create_preview_configuration.
Rename your call and you should be fine.

[UcefMountacer]

Thank you, that helped me !!