(process:10728): GStreamer-CRITICAL **: gst_element_get_state: assertion 'GST_IS_ELEMENT (element)' failed

Question

I am using cap = cv.VideoCapture(0) When opening the camera to record video, the program will work but he prompts me ((process:10728): GStreamer-CRITICAL **: gst_element_get_state: assertion 'GST_IS_ELEMENT (element)' failed ) I don't know what the reason is, is it because of a problem with your cmake or a problem with the installation?

is it related to https://stackoverflow.com/q/21785123, or https://stackoverflow.com/q/51303321? — SpeedCoder5, Oct 17 '18 at 14:02

score 1 · Accepted Answer · answered Nov 25 '18 at 22:52

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I had similar issue in version 3.4.4, compiled with gstreamer support. Syntax "cv2.VideoCapture(0)" just stopped working. I had all gst-* libraries installed, so most of answers wasn't helpful. But finally changing VideoCapture argument to full device path ("/dev/video0") helped.

answered Nov 25 '18 at 22:52

dervan

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You're right ! I was using cv::VideoCapture::open(int index)and it sometimes worked, sometimes not ... I followed your advice and used cv::VideoCapture::open(device_filename) and it seems to wrok 100% of time ! Thanks a lot :) – Steven Dec 02 '18 at 22:55

score 1 · Answer 2 · edited Jan 20 '19 at 18:30

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Try:

cap = cv2.VideoCapture(0, cv2.CAP_V4L)

From this SO Answer

it works in my project

edited Jan 20 '19 at 18:30

Zoe

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answered Jan 20 '19 at 18:02

Oscar C

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Of course, it also works when error is caused on local video reading – A.Ametov May 14 '19 at 12:20

(process:10728): GStreamer-CRITICAL **: gst_element_get_state: assertion 'GST_IS_ELEMENT (element)' failed

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