[Python] Install gstreamer support for opencv python package

I have built my own opencv python package from source.

import cv2
print(cv2.__version__)


prints: 3.4.5

Now the issue I am facing is regarding the use of gstreamer from the VideoCapture class of opencv. I am trying to get this mimimum working example running on python3

cap = cv2.VideoCapture("videotestsrc ! appsink")

if not cap.isOpened():
print("Cannot capture test src. Exiting.")
quit()

while True:
ret, frame = cap.read()
if ret == False:
break
cv2.imshow("CVtest",frame)
if cv2.waitKey(1) & 0xFF == ord('q'):
break


Capture fails, producing my print above (see if statement). I checked:

import cv2
print(cv2.getBuildInformation())


prints:

Video I/O:
DC1394: NO
FFMPEG: NO
avcodec: NO
avformat: NO
avutil: NO
swscale: NO
avresample: NO
GStreamer: NO
libv4l/libv4l2: NO
v4l/v4l2: linux/videodev2.h


Seeing that, it made absolute sense that my gstreamer pipeline didn't work. I ensured WITH_GSTREAMER was set to ON during ccmake of OpenCV (which it already was). Still the issue maintained. I even tried setting WITH_GSTREAMER_0_10 to ON as well. Still no luck having gstreamer enabled from the cv2 python module.

Before anyone suggests using pip3 to install cv2. I tried that, too. The issue with getting the package from pip is, it doesn't let you configure gstreamer support at all.

Can anyone provide help here?

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