[Python] cv2/ffmpeg "grabFrame packet read max attempts exceeded" error after exactly reading...

I am using OpenCV to extract frames from videos, run a segmentation AI model, and save the frames and masks to a folder. When I run my code to extract the frame from I encounter the error "grabFrame packet read max attempts exceeded" after processing a certain number of frames. This issue occurs consistently for the same videos across multiple environments.

Error message:

[ WARN:0@379.898] global cap_ffmpeg_impl.hpp:1541 grabFrame packet read max attempts exceeded, if your video have multiple streams (video, audio) try to increase attempt limit by setting environment variable OPENCV_FFMPEG_READ_ATTEMPTS (current value is 10000)


Minimum Reproducible Example

import os
import cv2

videofilename = "test.mp4"
capture = cv2.VideoCapture(videofilename)
frameNum = 0

createfolder = os.getcwd() + '/' + videofilename.split(".")[0] + '/'
if not os.path.exists(createfolder):
os.makedirs(createfolder)
os.makedirs(createfolder + "/frames/")

while True:
success, frame = capture.read()
if success is False:
break
frameNum += 1
framedownloadname = videofilename.split(".")[0] + '-fr' + str(frameNum) + '.jpg'
framedownloadloc = createfolder + '/frames/' + framedownloadname
print(framedownloadloc)
cv2.imwrite(framedownloadloc, frame)
img = cv2.imread(framedownloadloc)
img = cv2.cvtColor(img, cv2.COLOR_BGR2RGB)

capture.release()


As suggested in error, I increased the OPENCV_FFMPEG_READ_ATTEMPTS env variable up to 10000. However, this seems to have little to no effect on the number of frames before the error appears.

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