How to use Gstreamer pipeline in OpenCV ?
"""https://answers.opencv.org/question/202017/how-to-use-gstreamer-pipeline-in-opencv/"""
def send():
cap_send = cv2.VideoCapture('videotestsrc ! video/x-raw,framerate=20/1 ! videoscale ! videoconvert ! appsink', cv2.CAP_GSTREAMER)
out_send = cv2.VideoWriter('appsrc ! videoconvert ! x264enc tune=zerolatency bitrate=500 speed-preset=superfast ! rtph264pay ! udpsink host=127.0.0.1 port=5000',cv2.CAP_GSTREAMER,0, 20, (320,240), True)
if not cap_send.isOpened() or not out_send.isOpened():
print('VideoCapture or VideoWriter not opened')
exit(0)
while True:
ret,frame = cap_send.read()
if not ret:
print('empty frame')
break
out_send.write(frame)
cv2.imshow('send', frame)
if cv2.waitKey(1)&0xFF == ord('q'):
break
cap_send.release()
out_send.release()
def receive():
cap_receive = cv2.VideoCapture('udpsrc port=5000 caps = "application/x-rtp, media=(string)video, clock-rate=(int)90000, encoding-name=(string)H264, payload=(int)96" ! rtph264depay ! decodebin ! videoconvert ! appsink', cv2.CAP_GSTREAMER)
if not cap_receive.isOpened():
print('VideoCapture not opened')
exit(0)
while True:
ret,frame = cap_receive.read()
if not ret:
print('empty frame')
break
cv2.imshow('receive', frame)
if cv2.waitKey(1)&0xFF == ord('q'):
break
#cap_receive.release()
if __name__ == '__main__':
s = Process(target=send)
r = Process(target=receive)
s.start()
r.start()
s.join()
r.join()
cv2.destroyAllWindows()