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Capture and display video from either IP CAM, USB webcam, or the Tegra X2/X1 onb...

 1 year ago
source link: https://gist.github.com/jkjung-avt/86b60a7723b97da19f7bfa3cb7d2690e
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niteshgaba commented on Apr 12, 2021 •

edited

Hi @jkjung-avt

I am open-cv to only capture the frames from the terminal, everything works fine till I try to release the camera object, the system throws "GST_ARGUS: Cleaning up Segmentation fault (core dumped)". Could you please help me through? If you could have a look https://gist.github.com/niteshgaba/2148e78ae5276907fc49c4eddb44446e

thank you @jkjung-avt for posting this useful tip. I have followed your rtsp setup for ip camera and it does work.
In fact the cap is open and I can take frames from the cap object. However, I got the following warnings and somewhat intermittent performance issues with the capture:

(python3:10309): GStreamer-CRITICAL **: 10:25:13.291: gst_caps_is_empty: assertion 'GST_IS_CAPS (caps)' failed

(python3:10309): GStreamer-CRITICAL **: 10:25:13.291: gst_caps_truncate: assertion 'GST_IS_CAPS (caps)' failed

(python3:10309): GStreamer-CRITICAL **: 10:25:13.291: gst_caps_fixate: assertion 'GST_IS_CAPS (caps)' failed

(python3:10309): GStreamer-CRITICAL **: 10:25:13.291: gst_caps_get_structure: assertion 'GST_IS_CAPS (caps)' failed

(python3:10309): GStreamer-CRITICAL **: 10:25:13.291: gst_structure_get_string: assertion 'structure != NULL' failed

(python3:10309): GStreamer-CRITICAL **: 10:25:13.291: gst_mini_object_unref: assertion 'mini_object != NULL' failed
NvMMLiteOpen : Block : BlockType = 261 
NVMEDIA: Reading vendor.tegra.display-size : status: 6 
NvMMLiteBlockCreate : Block : BlockType = 261 
Allocating new output: 1280x720 (x 12), ThumbnailMode = 0
OPENMAX: HandleNewStreamFormat: 3605: Send OMX_EventPortSettingsChanged: nFrameWidth = 1280, nFrameHeight = 720 
[ WARN:0] global /home/nvidia/host/build_opencv/nv_opencv/modules/videoio/src/cap_gstreamer.cpp (896) open OpenCV | GStreamer warning: unable to query duration of stream
[ WARN:0] global /home/nvidia/host/build_opencv/nv_opencv/modules/videoio/src/cap_gstreamer.cpp (933) open OpenCV | GStreamer warning: Cannot query video position: status=1, value=0, duration=-1

Is there anything I can do to get rid of those critical warning?

gst string is exactly the same as you suggested:

gst_str = ('rtspsrc location={} latency={} ! '
                        'rtph264depay ! h264parse ! omxh264dec ! '
                        'nvvidconv ! '
                        'video/x-raw, width=(int){}, height=(int){}, '
                        'format=(string)BGRx ! videoconvert ! '
                        'appsink').format(uri, latency, width, height)

report

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