Capture d'images avec OpenCV 2.2 et Python sous Linux (Fedora 15 bêta) - Stack Overflow

I have the code below ;

import cv
import time

cv.NamedWindow("camera", 1)

capture = cv.CaptureFromCAM(0)

while True:
    img = cv.QueryFrame(capture)
    cv.ShowImage("camera", img)
    if cv.WaitKey(10) == 27:
    break

The above code is OpenCV-2.2's own CAM capture script for Python. So I know nothing is wrong with the program. And I can use my cam with different applications on Linux like the program called Cheese. However when I compile this program I get an error as below;

(camera:2519): GStreamer-CRITICAL **: gst_debug_add_log_function: assertion `func != NULL' failed

(gst-plugin-scanner:2521): GStreamer-WARNING **: Failed to load plugin '/usr/lib64/gstreamer-0.10/libgstbcmdec.so': /usr/lib64/gstreamer-0.10/libgstbcmdec.so: undefined symbol: gst_video_format_new_caps

I'm guessing that there is something wrong with the GStreamer. Is there a way to fix this? Or is there a problem with OpenCV-2.2 itself? Or maybe something is wrong with the sample script?

Thank you for your time.

That symbol should be provided by the package gstreamer-plugins-base.

Check if you have it installed. If you do have it, it means your version of this package is older than what OpenCV 2.2 needs. It's best to update the entire GStreamer on your platform just to be sure.

Try using a different camera index

capture = cv.cvCaptureFromCam(1)

or other higher indexes

I have the code below ;

import cv
import time

cv.NamedWindow("camera", 1)

capture = cv.CaptureFromCAM(0)

while True:
    img = cv.QueryFrame(capture)
    cv.ShowImage("camera", img)
    if cv.WaitKey(10) == 27:
    break

The above code is OpenCV-2.2's own CAM capture script for Python. So I know nothing is wrong with the program. And I can use my cam with different applications on Linux like the program called Cheese. However when I compile this program I get an error as below;

(camera:2519): GStreamer-CRITICAL **: gst_debug_add_log_function: assertion `func != NULL' failed

(gst-plugin-scanner:2521): GStreamer-WARNING **: Failed to load plugin '/usr/lib64/gstreamer-0.10/libgstbcmdec.so': /usr/lib64/gstreamer-0.10/libgstbcmdec.so: undefined symbol: gst_video_format_new_caps

I'm guessing that there is something wrong with the GStreamer. Is there a way to fix this? Or is there a problem with OpenCV-2.2 itself? Or maybe something is wrong with the sample script?

Thank you for your time.

That symbol should be provided by the package gstreamer-plugins-base.

Check if you have it installed. If you do have it, it means your version of this package is older than what OpenCV 2.2 needs. It's best to update the entire GStreamer on your platform just to be sure.

Try using a different camera index

capture = cv.cvCaptureFromCam(1)

or other higher indexes

Source