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• Merge commit ’51ca3cb604a7585a7cff35d4b954794508955c19’

  15 février 2015, par Michael Niedermayer

  Merge commit ’51ca3cb604a7585a7cff35d4b954794508955c19’
  * commit ’51ca3cb604a7585a7cff35d4b954794508955c19’ :
  
    xcbgrab : Use the correct geometry for the region highlight
  See : 0ae37e460c345a4c76e28256af56931e00c94cb5
  
  Merged-by : Michael Niedermayer <michaelni@gmx.at>
  

• OpenCV - motion detection in large video files

  18 décembre 2023, par M9A

  I have large video files (over a few GB each) that I am trying detect motion on. I am using fairly basic OpenCV code in python with ROI to detect motion in a certain area of the video only. This works absolutely fine but takes absolutely ages to process large files. Is there any way to speed things up ? I am simply just checking to see which file has motion detected in it and will not be outputting a video. The moment the first motion is detected the rest of the file is not checked.

  


  import sys
import cv2

video_path = “video.mp4”

capture = cv2.VideoCapture(video_path)

# Set the first frame as the reference background
_, background = capture.read()

# Define the region of interest (ROI)
x, y, w, h = 1468, 1142, 412, 385
roi = (x, y, x + w, y + h)

while capture.isOpened():
    ret, frame = capture.read()

    if not ret:
        break

    # Extract the region of interest from the current frame
    frame_roi = frame[y:y + h, x:x + w]

    # Calculate the absolute difference between the ROI and the background
    diff = cv2.absdiff(background[y:y + h, x:x + w], frame_roi)
    gray = cv2.cvtColor(diff, cv2.COLOR_BGR2GRAY)
    _, thresh = cv2.threshold(gray, 30, 255, cv2.THRESH_BINARY)

    # Check if motion is detected in the ROI (adjust threshold as needed)
    if cv2.countNonZero(thresh) > 75:
        print("YES")
        break

# Release the video capture object
capture.release()


  


• Anomalie #4543 : Accessibilité des chargements ajax (live regions)

  4 septembre 2020, par nicod _

  Si sur le site de cette région, ya pas mal d’ajax qui se recharge "tout seul" sans interaction, possible oui ça va pas du tout,

  Non non, ce sont les cas classiques d’utilisation "de base" : formulaires, et listes de résultats avec paginations.