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Critical Error reading RTSP stream from IP cameras

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malharjajoo

Critical Error reading RTSP stream from IP cameras

Hi,

I am using sricam SP019 IP(Wireless) camera.

I have been able to find the RTSP URL for my camera: ("rtsp://IP_ADDRESS:554/onvif1").

However, I am unable to open the RTSP stream using openCV VideoCapture interface.

Already tried ( and didn't help much )-

I have posted in the openCV forum but have not received any reply yet.
Tried the BigBuckBunny RTSP URL from website (https://www.wowza.com/html/mobile.html)
and it works using openCV cv::VideoCapture().
I managed to play my IP cameras RTSP stream in VLC and the onvifer Android app provided.

The app also provided the following info -

- Encoding: H264

- Transport Protocol: RTP/RTSP/TCP

- RTSP port: 554
I have also recompiled openCV from scratch enabling gstreamer and ffmpeg Cmake Flags (-D WITH_GSTREAMER=ON and -D WITH_FFMPEG=ON).

However, I still keep getting the error shown: GLib-GObject-CRITICAL **: g_object_set: assertion 'G_IS_OBJECT (object)' failed

My question:

It would be extremely helpful if someone could give a hint as to what's causing the error.

Thanks!

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Mark Howell

Re: Critical Error reading RTSP stream from IP cameras

On 01/22/2018 04:36 AM, Jajoo, Malhar wrote:

Hi,

I am using sricam SP019 IP(Wireless) camera.

I have been able to find the RTSP URL for my camera: (<a class="moz-txt-link-rfc2396E" href="rtsp://IP_ADDRESS:554/onvif1">"rtsp://IP_ADDRESS:554/onvif1").

However, I am unable to open the RTSP stream using openCV VideoCapture interface.

Already tried ( and didn't help much )-

I have posted in the openCV forum but have not received any reply yet.

Tried the BigBuckBunny RTSP URL from website (https://www.wowza.com/html/mobile.html)
and it works using openCV cv::VideoCapture().

I managed to play my IP cameras RTSP stream in VLC and the onvifer Android app provided.

The app also provided the following info -

- Encoding: H264

- Transport Protocol: RTP/RTSP/TCP

- RTSP port: 554

I have also recompiled openCV from scratch enabling gstreamer and ffmpeg Cmake Flags (-D WITH_GSTREAMER=ON and -D WITH_FFMPEG=ON).

However, I still keep getting the error shown: GLib-GObject-CRITICAL **: g_object_set: assertion 'G_IS_OBJECT (object)' failed

My question:

It would be extremely helpful if someone could give a hint as to what's causing the error.

Thanks!
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1) Try playing the RTSP stream in something like VLC (videolan.org) to make sure the camera is working

2) Try using gst-launch-1.0 at the command line to build a pipeline that plays your camera stream with just GStreamer; this would isolate it from any OpenCV issues (for which you may not find much help here).

something like:

$ gst-launch-1.0 -v rtspsrc location=<a class="moz-txt-link-freetext" href="rtsp://IP_ADDRESS:554/onvif1">rtsp://IP_ADDRESS:554/onvif1 ! rtph264depay ! avdec_h264 ! videoconvert ! xvimagesink

there are also more automatic/portable ways to do that with playbin, e.g.:

gst-launch-1.0 -v playbin uri=<a class="moz-txt-link-freetext" href="rtsp://IP_ADDRESS:554/onvif1">rtsp://IP_ADDRESS:554/onvif1

Cheers,

Mark.

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malharjajoo

Re: Critical Error reading RTSP stream from IP cameras

Hi Mark,

Thanks a lot for your suggestion. I have been able to play the RTSP stream in VLC media player.

For the 1st command you suggested,
I have tried to construct a pipeline(based on some googling) -}

$ gst-launch-1.0 -v rtspsrc location="<rtsp_url>" latency=10 ! rtph264depay ! h264parse ! omxh264dec ! videoconvert ! xvimagesink

I keep getting the warning: No element "<some element>" for some of the elements.
I am currently looking into this issue.
For the 2nd command you suggested,
I am able to play the file, but there is only audio. I see some errors on my console reporting that
I do not have H264 decoder or it cannot be found.

I am having quite some difficulty in resolving these as I'm having shortage of time + multimedia frameworks is not
the central focus of my project :( .

Any help will be greatly appreciated.

Best,

Malhar

From: gstreamer-devel <[hidden email]> on behalf of Mark Howell <[hidden email]>
Sent: Monday, January 22, 2018 8:01:56 PM
To: [hidden email]
Subject: Re: Critical Error reading RTSP stream from IP cameras

On 01/22/2018 04:36 AM, Jajoo, Malhar wrote:

Hi,

I am using sricam SP019 IP(Wireless) camera.

I have been able to find the RTSP URL for my camera: ("rtsp://IP_ADDRESS:554/onvif1").

However, I am unable to open the RTSP stream using openCV VideoCapture interface.

Already tried ( and didn't help much )-

I have posted in the openCV forum but have not received any reply yet.

Tried the BigBuckBunny RTSP URL from website (https://www.wowza.com/html/mobile.html)
and it works using openCV cv::VideoCapture().

I managed to play my IP cameras RTSP stream in VLC and the onvifer Android app provided.

The app also provided the following info -

- Encoding: H264

- Transport Protocol: RTP/RTSP/TCP

- RTSP port: 554

I have also recompiled openCV from scratch enabling gstreamer and ffmpeg Cmake Flags (-D WITH_GSTREAMER=ON and -D WITH_FFMPEG=ON).

However, I still keep getting the error shown: GLib-GObject-CRITICAL **: g_object_set: assertion 'G_IS_OBJECT (object)' failed

My question:

It would be extremely helpful if someone could give a hint as to what's causing the error.

Thanks!
_______________________________________________
gstreamer-devel mailing list
[hidden email]
https://lists.freedesktop.org/mailman/listinfo/gstreamer-devel

1) Try playing the RTSP stream in something like VLC (videolan.org) to make sure the camera is working

something like:

$ gst-launch-1.0 -v rtspsrc location=rtsp://IP_ADDRESS:554/onvif1 ! rtph264depay ! avdec_h264 ! videoconvert ! xvimagesink

there are also more automatic/portable ways to do that with playbin, e.g.:

gst-launch-1.0 -v playbin uri=rtsp://IP_ADDRESS:554/onvif1

Cheers,

Mark.

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gstreamer-devel mailing list
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Mark Howell

Re: Critical Error reading RTSP stream from IP cameras

On 01/22/2018 01:05 PM, Jajoo, Malhar wrote:

Hi Mark,

Thanks a lot for your suggestion. I have been able to play the RTSP stream in VLC media player.

For the 1st command you suggested,
I have tried to construct a pipeline(based on some googling) -}

$ gst-launch-1.0 -v rtspsrc location="<rtsp_url>" latency=10 ! rtph264depay ! h264parse ! omxh264dec ! videoconvert ! xvimagesink

I keep getting the warning: No element "<some element>" for some of the elements.
I am currently looking into this issue.

For the 2nd command you suggested,
I am able to play the file, but there is only audio. I see some errors on my console reporting that
I do not have H264 decoder or it cannot be found.

I am having quite some difficulty in resolving these as I'm having shortage of time + multimedia frameworks is not
the central focus of my project :( .

Any help will be greatly appreciated.

Best,

Malhar

Sounds like maybe your GStreamer installation does not have all these elements installed. That's not unusual, it's often broken up into multiple packages depending on the platform. I didn't catch whether you were linux, mac, windows etc.

h264parse, for example, is in gst-plugins-bad, go see if such a package is installed on your system, if not, find it.

You can look for information on individual elements (if they are present) with, for example:

$ gst-inspect-1.0 h264parse

Or list them all with:

$ gst-inspect-1.0

Or look for stuff mentioning h.264 with, e.g.:

$ gst-inspect-1.0 -a | grep h264

Last, come back with more specific error messages rather than just "some errors"

Cheers,

Mark.

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Sachchit

Re: Critical Error reading RTSP stream from IP cameras

In reply to this post by Mark Howell

Adding to Mark's answer.

Check whether your Gstreamer installation has gst-libav installed or not? In
windows it is generally installed in standard installation. In linux you
have to do it separately.

After that check the following
gst-inspect-1.0 avdec_h264

If this element details are available, you can use following command
straightaway in your OpenCV implementation.
cap = cv::VideoCapture("rtspsrc location=rtsp://IP_ADDRESS:554/onvif1
latency=## ! rtph264depay ! avdec_h264 ! videoconvert ! appsink")

This will directly allow you to use cap.read(). I have tested it in Python.
I don't see any reason for this to not work in C++.

Cheers,
Sachchit

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