CODEWITHSUNDEEP
pythonopencv
Muhammad Ammar Malik
Muhammad Ammar Malik

Reputation: 19

Trouble saving video in opencv

I want to save my webcam video using opencv.

I wrote this code.

import numpy as np
import cv2

cap=cv2.VideoCapture(0)
#Define the codec
#FourCC code is passed as cv2.VideoWriter_fourcc('M','J','P','G')
#or cv2.VideoWriter_fourcc(*'MJPG') for MJPG.
fourcc = cv2.VideoWriter_fourcc(*'XVID')

#Define VideWrite object
#cv2.VideoWrite('arg1',arg2,arg3,(width,heigh))
#arg1:output file name
#arg2:Specify Fourcc code
#arg3: frames per seconds
#FourCC is a 4-byte code used to specify video codec
out=cv2.VideoWriter('SaveAVideo.avi',fourcc,20.0, (640,480))


while(cap.isOpened()):      

   ret,frame = cap.read()
   print('frame =',frame)
   print('ret = ',ret)
   if ret==True:
          frame =cv2.flip(frame,0)
          #Write the flipped frame
          out.write(frame)
          cv2.imshow('frame',frame)
          if cv2.waitKey(0) & 0xFF== ord('q'):
               break
   else:
          break
   print('after while loop')
# Release everything if job is finished
cap.release()
out.release()
cv2.destroyAllWindows()

The problem I am facing is that it is recording only black screen, although I have checked my webcam.

Upvotes: 1

Views: 683

Answers (1)

eyllanesc
eyllanesc

Reputation: 244282

As I said in my comment, the solution is to change:

cv2.waitKey(0)

to:

cv2.waitKey(another_value)

by example 1.

According to the docs the parameter that receives cv2.waitKey() indicates the delay that is given:

enter image description here

In your case it is necessary since saving the image in the video, also is always convenient since an image is given at 60Hz so Overcoming that frequency is unnecessary.

Upvotes: 1

Related Questions