cv::VideoCapture read live video stream but can't discriminate fake urls - opencv

Question

I tried to read live video stream with OpenCV as following,
cv::VideoCapture capture(video_url);
It can read from live video stream and works well. However, when a fake video_url was sent to it, such as an url of a txt file, for example,
video_url = "http://127.0.0.10:8090/result.txt"
it can also decode data from this fake url. But I want it to return error information when the video_url is fake.
How can I make it to be able to discriminate whether an url is truly of a live video stream, or a txt web file?

Answer 1

python
You can use URLValidator() for discriminating fake urls.
from django.core.exceptions import ValidationError
from django.core.validators import URLValidator
validate = URLValidator()
is_valid = False
url = "https://www.youtube.com/watch?v=vNSxargsAWk"
try:
validate(url)
is_valid = True
except ValidationError as exception:
print("url is not valid")
c++
Check the URL using regular expression.
#include <regex>
using namespace std;
int main()
{
regex url_validator("/((([A-Za-z]{3,9}:(?:\/\/)?)(?:[-;:&=\+\$,\w]+#)?[A-Za-z0-9.-]+(:[0-9]+)?|(?:www.|[-;:&=\+\$,\w]+#)[A-Za-z0-9.-]+)((?:\/[\+~%\/.\w-_]*)?\??(?:[-\+=&;%#.\w_]*)#?(?:[\w]*))?)/");
if(regex_match(input, url_validator))
cout<<"Input is an integer"<<endl;
else
cout<<"Invalid input : Not an integer"<<endl;
}