python sorting filename for opencv

Question

I'm trying to sorting the jpgs (ascending numerically) in my directory to generate a video for opencv, but I'm having a a hard time finding a solution:

images = []
for f in os.listdir('.'):
    if f.endswith('.jpg'):
        images.append(f)

images[]:

['img_0.jpg', 'img_1.jpg', 'img_10.jpg', 'img_100.jpg', 'img_101.jpg', 'img_102.jpg', ... 'img_99.jpg']

are you trying to sort by their string or int values of their numbers? — Primusa, Apr 14 '18 at 03:45
Possible duplicate of [How to correctly sort a string with a number inside?](https://stackoverflow.com/questions/5967500/how-to-correctly-sort-a-string-with-a-number-inside) — eyllanesc, Apr 14 '18 at 03:59

score 0 · Answer 1 · answered Apr 14 '18 at 03:39

0

import cv2
vidcap = cv2.VideoCapture('big_buck_bunny_720p_5mb.mp4')
success,image = vidcap.read()
count = 0
success = True
while success:
 cv2.imwrite("frame%d.jpg" % count, image)     # save frame as JPEG file      
 success,image = vidcap.read()
 print('Read a new frame: ', success)
 count += 1

answered Apr 14 '18 at 03:39

DeCastroAj

30
7

not sure if this is what you meant, i found an example online – DeCastroAj Apr 14 '18 at 03:40
sorry, i meant to ask how to sort my jpg files in my directory – ddgg007 Apr 14 '18 at 03:46

Rehan Azher · Answer 2 · 2018-04-14T03:51:01.280

0

You can use Os:

from os import listdir
from os.path import isfile, join
jpgfiles = [f for f in listdir('.') if isfile(join('.', f)) and f.endswith(".txt")]
jpgfiles.sort()

edited Apr 14 '18 at 03:51

answered Apr 14 '18 at 03:43

Rehan Azher

1,340
1
9
17

im getting: _NameError: name 'isfile' is not defined_ – ddgg007 Apr 14 '18 at 03:50
updated code i forget to add two imports. and no space in `jpgfiles.sort()` – Rehan Azher Apr 14 '18 at 03:51
It's still outputting _'img_10.jpg'_ or _'img_100.jpg'_ before _'img_9.jpg'_ – ddgg007 Apr 14 '18 at 03:55
Are u expecting alpha numeric sort ? i.e. img_9, img_10 and so on ? – Rehan Azher Apr 14 '18 at 03:57

python sorting filename for opencv

2 Answers2