CODEWITHSUNDEEP
pythonopencv
BioShock
BioShock

Reputation: 793

Save Video as Frames OpenCV{PY}

I would like to create a program which saves .jpg images taken from the webcam(frames). What my program do for now is, opening a webcam, taking one and only one frame, and then everything stops.

What i would like to have is more than one frame My error-code is this one:

import numpy as np
import cv2
cap = cv2.VideoCapture(0)
count = 0

while True:
   # Capture frame-by-frame
   ret, frame = cap.read()

   # Our operations on the frame come here
   gray = cv2.cvtColor(frame, cv2.COLOR_BGR2GRAY)
   cv2.imwrite("frame%d.jpg" % ret, frame)     # save frame as JPEG file
   count +=1

   # Display the resulting frame
   cv2.imshow('frame',gray)
   if cv2.waitKey(10):
      break

Upvotes: 6

Views: 23075

Answers (4)

Joseph
Joseph

Reputation: 71

Though this is late I have to say that prtkp's answer is what you needed... the , ret value you use to enumerate your images is wrong. Ret is only a boolean... so while it detects the image it its placing a one there for the name of the image...

I just used this... with a c=0 on the header

 cv2.imwrite("img/frame %d.jpg" % c,img)
    c=c+1

Upvotes: 1

prtkp
prtkp

Reputation: 570

use this - 

count = 0
cv2.imwrite("frame%d.jpg" % count, frame)
count = count+1

Upvotes: 5

floppy12
floppy12

Reputation: 1053

Actually it sounds like you are always saving your image with the same name because you are concatenating ret instead of count in the imwrite method

try this :

name = "frame%d.jpg"%count
cv2.imwrite(name, frame)     # save frame as JPEG file

Upvotes: 10

sansuiso
sansuiso

Reputation: 9379

When no key is pressed and the time delay expires, cv2.waitKey returns -1. You can check it in the doc.

Basically, all you have to do is changing slightly the end of your program:

# Display the resulting frame
cv2.imshow('frame',gray)
if cv2.waitKey(10) != -1:
    break

Upvotes: 2

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