Read H264 livestream using ffmpeg and cv2

Got a Solar WiFi IP camera from Wireless Solar IP67 Security Camera System Outdoor Home Cam 1080P 2MP

Wondering to capture video or images from the camera using script/program.

ffmpeg -re -i "http://host ip:81/livestream.cgi?user=admin&pwd=&streamid=0" -c copy -f mpegts test.mp4

ffmpeg -i "http://host ip:81/livestream.cgi?user=admin&pwd=a123&streamid=0" -c copy -f mpegts -ss 5 -frames:v 5 testt.png

FFMPEG is not portable, another way of using cv2 to capture a picture:
(ref Not able to play .h264 video on OpenCV?)

cap = cv2.VideoCapture('http://host:81/livestream.cgi?user=admin&pwd=&streamid=0')
            ret, frame =
            # write to local file
            # create memory file object save to AWS S3
            #img_data = io.BytesIO(cv2.imencode('.png', frame)[1])