ubuntu vm - ip camera RTSP is not not getting the frame

Question

Hi, i am running a ubuntu VM and trying to get my RTSP from IP camera using open CV but without any success.

import cv2
import os

RTSP_URL = 'rtsp://xxxxx:xxxxxxxxx@178.199.xxx.xx:554/stream1'

cap = cv2.VideoCapture(RTSP_URL)

if not cap.isOpened():
print('Cannot open RTSP stream')
exit(-1)

while True:
print(cap.read())
ret, frame = cap.read()
cv2.imshow('RTSP stream', frame)

if cv2.waitKey(1) == 27:
    break

cap.release()
cv2.destroyAllWindows()

The error i am getting is:

(False, None)
Traceback (most recent call last):
File "b.txt", line 17, in
cv2.imshow('RTSP stream', frame)
cv2.error: OpenCV(4.5.5) /io/opencv/modules/highgui/src/window.cpp:1000: error: (-215:Assertion failed) size.width>0 && size.height>0 in function 'imshow'

This RTSP is working fine in VLC and on local computer but not working when i am trying to run from a Azure VM. Please help asap

Answer

@Ashwin Kumar Samal , I did stream with the following code in my environment where I see there is no issue with the code. Also, there should not be any barriers from the OS side. I suggest you check these two,

You should use the Public IP of your router while connecting to RSTP URL.
Make sure you open the 554 ports on your VM NSG rules. (NSG's are Firewall rules that will by default restrict I/B and O/B traffic to a VM).

This should solve your issue.

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