GST_IS_BUFFER (buf)' failed with jetson.utils.VideoSource

Mechanical engineer here trying to learn Linux and I have hit a wall and need a push!
I’m a beginner so I hope its something dumb on my part.

I have a USB camera that was working perfect with the previous my-detection example that used: jetson.utils.gstCamera (1280, 720, “/dev/video1”).

The new version of my-detection uses jetson.utils.VideoSource("/dev/video1") and when running with the camera i get the following error:

** (python3:321): CRITICAL **: 21:01:55.604: gst_adapter_push: assertion ‘GST_IS_BUFFER (buf)’ failed
Segmentation fault (core dumped)

I get the same (GST_IS_BUFFER (buf)’ failed) error if i use:
video-viewer v4l2:///dev/video1

However, I can view the camera (at only 10fps) with:
video-viewer --input-width=1280 --input-height=720 --input-codec=raw /dev/video1

This does not work:
video-viewer --input-width=1280 --input-height=720 --input-codec=mjpeg /dev/video1

I can view the camera at 30 fps with:
gst-launch-1.0 -v v4l2src device=/dev/video1 ! jpegdec ! video/x-raw,framerate=30/1,width=1280,height=720 ! videoconvert ! xvimagesink

How do i get the new VideoSource to work like the command above?
It seems there is some camera pipeline buffer issue? maybe?

My logitech C270 works on Video0, however, it displays a consistent QOS error every update:

Results of: v4l2-ctl --list-formats-ext
Video0 is Logitech C270 and Video1 is the USB camera I need

ioctl: VIDIOC_ENUM_FMT
Index : 0
Type : Video Capture
Pixel Format: ‘YUYV’
Name : YUYV 4:2:2
Size: Discrete 640x480
Interval: Discrete 0.033s (30.000 fps)
Interval: Discrete 0.040s (25.000 fps)
Interval: Discrete 0.050s (20.000 fps)
Interval: Discrete 0.067s (15.000 fps)
Interval: Discrete 0.100s (10.000 fps)
Interval: Discrete 0.200s (5.000 fps)
Size: Discrete 160x120
Interval: Discrete 0.033s (30.000 fps)
Interval: Discrete 0.040s (25.000 fps)
Interval: Discrete 0.050s (20.000 fps)
Interval: Discrete 0.067s (15.000 fps)
Interval: Discrete 0.100s (10.000 fps)
Interval: Discrete 0.200s (5.000 fps)
Size: Discrete 176x144
Interval: Discrete 0.033s (30.000 fps)
Interval: Discrete 0.040s (25.000 fps)
Interval: Discrete 0.050s (20.000 fps)
Interval: Discrete 0.067s (15.000 fps)
Interval: Discrete 0.100s (10.000 fps)
Interval: Discrete 0.200s (5.000 fps)
Size: Discrete 320x176
Interval: Discrete 0.033s (30.000 fps)
Interval: Discrete 0.040s (25.000 fps)
Interval: Discrete 0.050s (20.000 fps)
Interval: Discrete 0.067s (15.000 fps)
Interval: Discrete 0.100s (10.000 fps)
Interval: Discrete 0.200s (5.000 fps)
Size: Discrete 320x240
Interval: Discrete 0.033s (30.000 fps)
Interval: Discrete 0.040s (25.000 fps)
Interval: Discrete 0.050s (20.000 fps)
Interval: Discrete 0.067s (15.000 fps)
Interval: Discrete 0.100s (10.000 fps)
Interval: Discrete 0.200s (5.000 fps)
Size: Discrete 352x288
Interval: Discrete 0.033s (30.000 fps)
Interval: Discrete 0.040s (25.000 fps)
Interval: Discrete 0.050s (20.000 fps)
Interval: Discrete 0.067s (15.000 fps)
Interval: Discrete 0.100s (10.000 fps)
Interval: Discrete 0.200s (5.000 fps)
Size: Discrete 432x240
Interval: Discrete 0.033s (30.000 fps)
Interval: Discrete 0.040s (25.000 fps)
Interval: Discrete 0.050s (20.000 fps)
Interval: Discrete 0.067s (15.000 fps)
Interval: Discrete 0.100s (10.000 fps)
Interval: Discrete 0.200s (5.000 fps)
Size: Discrete 544x288
Interval: Discrete 0.033s (30.000 fps)
Interval: Discrete 0.040s (25.000 fps)
Interval: Discrete 0.050s (20.000 fps)
Interval: Discrete 0.067s (15.000 fps)
Interval: Discrete 0.100s (10.000 fps)
Interval: Discrete 0.200s (5.000 fps)
Size: Discrete 640x360
Interval: Discrete 0.033s (30.000 fps)
Interval: Discrete 0.040s (25.000 fps)
Interval: Discrete 0.050s (20.000 fps)
Interval: Discrete 0.067s (15.000 fps)
Interval: Discrete 0.100s (10.000 fps)
Interval: Discrete 0.200s (5.000 fps)
Size: Discrete 752x416
Interval: Discrete 0.040s (25.000 fps)
Interval: Discrete 0.050s (20.000 fps)
Interval: Discrete 0.067s (15.000 fps)
Interval: Discrete 0.100s (10.000 fps)
Interval: Discrete 0.200s (5.000 fps)
Size: Discrete 800x448
Interval: Discrete 0.050s (20.000 fps)
Interval: Discrete 0.067s (15.000 fps)
Interval: Discrete 0.100s (10.000 fps)
Interval: Discrete 0.200s (5.000 fps)
Size: Discrete 800x600
Interval: Discrete 0.050s (20.000 fps)
Interval: Discrete 0.067s (15.000 fps)
Interval: Discrete 0.100s (10.000 fps)
Interval: Discrete 0.200s (5.000 fps)
Size: Discrete 864x480
Interval: Discrete 0.050s (20.000 fps)
Interval: Discrete 0.067s (15.000 fps)
Interval: Discrete 0.100s (10.000 fps)
Interval: Discrete 0.200s (5.000 fps)
Size: Discrete 960x544
Interval: Discrete 0.067s (15.000 fps)
Interval: Discrete 0.100s (10.000 fps)
Interval: Discrete 0.200s (5.000 fps)
Size: Discrete 960x720
Interval: Discrete 0.100s (10.000 fps)
Interval: Discrete 0.200s (5.000 fps)
Size: Discrete 1024x576
Interval: Discrete 0.100s (10.000 fps)
Interval: Discrete 0.200s (5.000 fps)
Size: Discrete 1184x656
Interval: Discrete 0.100s (10.000 fps)
Interval: Discrete 0.200s (5.000 fps)
Size: Discrete 1280x720
Interval: Discrete 0.133s (7.500 fps)
Interval: Discrete 0.200s (5.000 fps)
Size: Discrete 1280x960
Interval: Discrete 0.133s (7.500 fps)
Interval: Discrete 0.200s (5.000 fps)

Index       : 1
Type        : Video Capture
Pixel Format: 'MJPG' (compressed)
Name        : Motion-JPEG
	Size: Discrete 640x480
		Interval: Discrete 0.033s (30.000 fps)
		Interval: Discrete 0.040s (25.000 fps)
		Interval: Discrete 0.050s (20.000 fps)
		Interval: Discrete 0.067s (15.000 fps)
		Interval: Discrete 0.100s (10.000 fps)
		Interval: Discrete 0.200s (5.000 fps)
	Size: Discrete 160x120
		Interval: Discrete 0.033s (30.000 fps)
		Interval: Discrete 0.040s (25.000 fps)
		Interval: Discrete 0.050s (20.000 fps)
		Interval: Discrete 0.067s (15.000 fps)
		Interval: Discrete 0.100s (10.000 fps)
		Interval: Discrete 0.200s (5.000 fps)
	Size: Discrete 176x144
		Interval: Discrete 0.033s (30.000 fps)
		Interval: Discrete 0.040s (25.000 fps)
		Interval: Discrete 0.050s (20.000 fps)
		Interval: Discrete 0.067s (15.000 fps)
		Interval: Discrete 0.100s (10.000 fps)
		Interval: Discrete 0.200s (5.000 fps)
	Size: Discrete 320x176
		Interval: Discrete 0.033s (30.000 fps)
		Interval: Discrete 0.040s (25.000 fps)
		Interval: Discrete 0.050s (20.000 fps)
		Interval: Discrete 0.067s (15.000 fps)
		Interval: Discrete 0.100s (10.000 fps)
		Interval: Discrete 0.200s (5.000 fps)
	Size: Discrete 320x240
		Interval: Discrete 0.033s (30.000 fps)
		Interval: Discrete 0.040s (25.000 fps)
		Interval: Discrete 0.050s (20.000 fps)
		Interval: Discrete 0.067s (15.000 fps)
		Interval: Discrete 0.100s (10.000 fps)
		Interval: Discrete 0.200s (5.000 fps)
	Size: Discrete 352x288
		Interval: Discrete 0.033s (30.000 fps)
		Interval: Discrete 0.040s (25.000 fps)
		Interval: Discrete 0.050s (20.000 fps)
		Interval: Discrete 0.067s (15.000 fps)
		Interval: Discrete 0.100s (10.000 fps)
		Interval: Discrete 0.200s (5.000 fps)
	Size: Discrete 432x240
		Interval: Discrete 0.033s (30.000 fps)
		Interval: Discrete 0.040s (25.000 fps)
		Interval: Discrete 0.050s (20.000 fps)
		Interval: Discrete 0.067s (15.000 fps)
		Interval: Discrete 0.100s (10.000 fps)
		Interval: Discrete 0.200s (5.000 fps)
	Size: Discrete 544x288
		Interval: Discrete 0.033s (30.000 fps)
		Interval: Discrete 0.040s (25.000 fps)
		Interval: Discrete 0.050s (20.000 fps)
		Interval: Discrete 0.067s (15.000 fps)
		Interval: Discrete 0.100s (10.000 fps)
		Interval: Discrete 0.200s (5.000 fps)
	Size: Discrete 640x360
		Interval: Discrete 0.033s (30.000 fps)
		Interval: Discrete 0.040s (25.000 fps)
		Interval: Discrete 0.050s (20.000 fps)
		Interval: Discrete 0.067s (15.000 fps)
		Interval: Discrete 0.100s (10.000 fps)
		Interval: Discrete 0.200s (5.000 fps)
	Size: Discrete 752x416
		Interval: Discrete 0.033s (30.000 fps)
		Interval: Discrete 0.040s (25.000 fps)
		Interval: Discrete 0.050s (20.000 fps)
		Interval: Discrete 0.067s (15.000 fps)
		Interval: Discrete 0.100s (10.000 fps)
		Interval: Discrete 0.200s (5.000 fps)
	Size: Discrete 800x448
		Interval: Discrete 0.033s (30.000 fps)
		Interval: Discrete 0.040s (25.000 fps)
		Interval: Discrete 0.050s (20.000 fps)
		Interval: Discrete 0.067s (15.000 fps)
		Interval: Discrete 0.100s (10.000 fps)
		Interval: Discrete 0.200s (5.000 fps)
	Size: Discrete 800x600
		Interval: Discrete 0.033s (30.000 fps)
		Interval: Discrete 0.040s (25.000 fps)
		Interval: Discrete 0.050s (20.000 fps)
		Interval: Discrete 0.067s (15.000 fps)
		Interval: Discrete 0.100s (10.000 fps)
		Interval: Discrete 0.200s (5.000 fps)
	Size: Discrete 864x480
		Interval: Discrete 0.033s (30.000 fps)
		Interval: Discrete 0.040s (25.000 fps)
		Interval: Discrete 0.050s (20.000 fps)
		Interval: Discrete 0.067s (15.000 fps)
		Interval: Discrete 0.100s (10.000 fps)
		Interval: Discrete 0.200s (5.000 fps)
	Size: Discrete 960x544
		Interval: Discrete 0.033s (30.000 fps)
		Interval: Discrete 0.040s (25.000 fps)
		Interval: Discrete 0.050s (20.000 fps)
		Interval: Discrete 0.067s (15.000 fps)
		Interval: Discrete 0.100s (10.000 fps)
		Interval: Discrete 0.200s (5.000 fps)
	Size: Discrete 960x720
		Interval: Discrete 0.033s (30.000 fps)
		Interval: Discrete 0.040s (25.000 fps)
		Interval: Discrete 0.050s (20.000 fps)
		Interval: Discrete 0.067s (15.000 fps)
		Interval: Discrete 0.100s (10.000 fps)
		Interval: Discrete 0.200s (5.000 fps)
	Size: Discrete 1024x576
		Interval: Discrete 0.033s (30.000 fps)
		Interval: Discrete 0.040s (25.000 fps)
		Interval: Discrete 0.050s (20.000 fps)
		Interval: Discrete 0.067s (15.000 fps)
		Interval: Discrete 0.100s (10.000 fps)
		Interval: Discrete 0.200s (5.000 fps)
	Size: Discrete 1184x656
		Interval: Discrete 0.033s (30.000 fps)
		Interval: Discrete 0.040s (25.000 fps)
		Interval: Discrete 0.050s (20.000 fps)
		Interval: Discrete 0.067s (15.000 fps)
		Interval: Discrete 0.100s (10.000 fps)
		Interval: Discrete 0.200s (5.000 fps)
	Size: Discrete 1280x720
		Interval: Discrete 0.033s (30.000 fps)
		Interval: Discrete 0.040s (25.000 fps)
		Interval: Discrete 0.050s (20.000 fps)
		Interval: Discrete 0.067s (15.000 fps)
		Interval: Discrete 0.100s (10.000 fps)
		Interval: Discrete 0.200s (5.000 fps)
	Size: Discrete 1280x960
		Interval: Discrete 0.033s (30.000 fps)
		Interval: Discrete 0.040s (25.000 fps)
		Interval: Discrete 0.050s (20.000 fps)
		Interval: Discrete 0.067s (15.000 fps)
		Interval: Discrete 0.100s (10.000 fps)
		Interval: Discrete 0.200s (5.000 fps)

Hmm, sometimes the QOS warnings are related to too much USB traffic. Do they go away if you only have one camera plugged in at a time?

Does the FPS of your other camera in raw mode go up if it is the only camera plugged in?

It seems like the nvjpegdec element has some issue with your MJPEG camera, but you seem to have it working with just the CPU-based jpegdec. So you could try changing this line from jetson-inference/utils/camera/gstCamera.cpp to use jpegdec instead:

Remember to re-run make and sudo make install after making changes.

If all else fails, you can revert to the previous code by cloning the 20200714 branch. That will take you back to before I made these changes where the camera now uses decoding instead of raw-mode only.

That has it running at a solid 20 fps!
You are the man!
Can I send an Amazon gift card to your nvidia email to say thanks?

The Logitech C270 QOS message disappeared with the wifi dongle unplugged

With the “problem camera” I do still have a persistent QOS message with everything unplugged from the USBs (Except keyboard and of course the problem camera)

[gstreamer] gstreamer message qos ==> jpegdec0

Is there a easy way to suppress this message? It seems to run fine otherwise.
It just muddies the terminal output

-Cheers!

Glad that you got it working again! Please don’t worry about sending anything, I am just happy to help out :)

You can change the logging level by running imagenet/detectnet/segnet program with the --log-level=info option, and this will suppress the verbose messages such as that one from gstreamer. However if you are using my-detection.py you need to pass the command-line arguments in order for them to be parsed:

import sys
camera = jetson.utils.videoSource("/dev/video0", argv=sys.argv)

Then it will know to automatically parse the --log-level command line argument (among others).

Alternatively, you can change the default logging level here in jetson-inference/utils/logging.h, line 70:
https://github.com/dusty-nv/jetson-utils/blob/916023814a1ac1401380c5d4313454c78c0a5f40/logging.h#L70
You can change that to DEFAULT=INFO and then re-run make and sudo make install.

Finally, the last alternative is to just comment out that gstreamer message logging itself:

For everyone’s education, I’ve suggested by PM 3 ways of doing this, 2 were weird but it seems that one worked out for this user without qos errors:
Try changing line 181 (from dustin’s post #2) to :

ss << "nvv4l2decoder mjpeg=1 ! video/x-raw(memory:NVMM) ! nvvidconv ! video/x-raw ! ";

Update:

Changing line 181 to:
ss << "nvv4l2decoder mjpeg=1 ! video/x-raw(memory:NVMM) ! nvvidconv ! video/x-raw ! ";

resulted in a green hue to the top half of camera stream and red on bottom half.

I thought it was the camera and swapped to a spare of the same model and it remained
I reverted back to jpegdec and this fixed it.

Really impressed with how helpful and responsive this forum is!
Thanks Everyone

@clay1,

Sorry if you’re not happy. I don’t think I’m guilty in any way.
You asked for help here.
I shared some potential workarounds by PM. Note that I’m in no way a NVIDIA representative. I’m a hobbyist trying to help users here.
You replied one was working. I replied you should share here.
You didn’t, nor report further problem here nor by PM.
So don’t be surprised that I’ve shared what you told was working…reusing your words ‘For everyone’s education…’, unless you only want to complain here.

I’m happy! No complaining here. It was an excellent suggestion!
I just wanted to share yesterdays findings so others don’t confuse it with a bad camera like I did.
I did not notice that behavior at first because the background was camouflaging it somewhat.
I am also a hobbyist with kids and sometimes it can take me several days to find the time to try different things and report back. I do appreciate your suggestions and apologize for the update not coming across with the proper tone.

1 Like

Sorry if I misunderstood your post. Glad to hear you’re happy :-)

You may try if adding jpegparse before decoder helps in such case:

ss << "jpegparse ! nvv4l2decoder mjpeg=1 ! video/x-raw(memory:NVMM) ! nvvidconv ! video/x-raw ! ";