How many webcam can Nvidia nano accept?

AK51 · July 26, 2022, 8:58am

Hi,

I am using dusty-nv inference object detection.
2 USB webcam is ok, but when I use 4 webcam, there is an error of the stream buffer. (I can try to recreate the problem later when I gather 4 USB cam again.)
I wonder if the program can accept 4 webcam (may be call them in a for loop and I can lower the resolution to (320x480))? Or the streamer can only accept 2 usb cam? Thx
Plan B: I am still looking for a way to convert usb cam to IP cam (using rtsp), no luck so far. >_<
Thx

DaneLLL · July 27, 2022, 1:51am

Hi,
If the cameras are USB2 camera, you may hit bandwidth and cannot open all cameras. Please check explanation in
connected more than two usb cameras problem on deepstream-app (Jetson Nano Dev Kit) - #12 by DaneLLL

AK51 · July 27, 2022, 2:35am

Here is my test phython program

import jetson.inference
import jetson.utils

net = jetson.inference.detectNet("ssd-mobilenet-v2", threshold=0.5)
camera0 = jetson.utils.videoSource("/dev/video0")      # '/dev/video0' for V4L2
camera1 = jetson.utils.videoSource("/dev/video1")      # '/dev/video0' for V4L2
camera2 = jetson.utils.videoSource("/dev/video2")      # '/dev/video0' for V4L2
camera3 = jetson.utils.videoSource("/dev/video3")      # '/dev/video0' for V4L2
display = jetson.utils.videoOutput("display://0") # 'my_video.mp4' for file
i = 0

while display.IsStreaming():
	if(i==0):
		img = camera0.Capture()
	elif(i==1):
		img = camera1.Capture()
	elif(i==2):
		img = camera2.Capture()
	elif(i==3):
		img = camera3.Capture()
	if(i>=3):
		i = 0
	else:
		i=i+1
	detections = net.Detect(img)
	display.Render(img)
	display.SetStatus("Object Detection | Network {:.0f} FPS".format(net.GetNetworkFPS()))

Here is the error

python3 cam4.py 
jetson.inference -- detectNet loading build-in network 'ssd-mobilenet-v2'

detectNet -- loading detection network model from:
          -- model        networks/SSD-Mobilenet-v2/ssd_mobilenet_v2_coco.uff
          -- input_blob   'Input'
          -- output_blob  'NMS'
          -- output_count 'NMS_1'
          -- class_labels networks/SSD-Mobilenet-v2/ssd_coco_labels.txt
          -- threshold    0.500000
          -- batch_size   1

[TRT]    TensorRT version 8.0.1
[TRT]    loading NVIDIA plugins...
[TRT]    Registered plugin creator - ::GridAnchor_TRT version 1
[TRT]    Registered plugin creator - ::GridAnchorRect_TRT version 1
[TRT]    Registered plugin creator - ::NMS_TRT version 1
[TRT]    Registered plugin creator - ::Reorg_TRT version 1
[TRT]    Registered plugin creator - ::Region_TRT version 1
[TRT]    Registered plugin creator - ::Clip_TRT version 1
[TRT]    Registered plugin creator - ::LReLU_TRT version 1
[TRT]    Registered plugin creator - ::PriorBox_TRT version 1
[TRT]    Registered plugin creator - ::Normalize_TRT version 1
[TRT]    Registered plugin creator - ::ScatterND version 1
[TRT]    Registered plugin creator - ::RPROI_TRT version 1
[TRT]    Registered plugin creator - ::BatchedNMS_TRT version 1
[TRT]    Registered plugin creator - ::BatchedNMSDynamic_TRT version 1
[TRT]    Could not register plugin creator -  ::FlattenConcat_TRT version 1
[TRT]    Registered plugin creator - ::CropAndResize version 1
[TRT]    Registered plugin creator - ::DetectionLayer_TRT version 1
[TRT]    Registered plugin creator - ::EfficientNMS_ONNX_TRT version 1
[TRT]    Registered plugin creator - ::EfficientNMS_TRT version 1
[TRT]    Registered plugin creator - ::Proposal version 1
[TRT]    Registered plugin creator - ::ProposalLayer_TRT version 1
[TRT]    Registered plugin creator - ::PyramidROIAlign_TRT version 1
[TRT]    Registered plugin creator - ::ResizeNearest_TRT version 1
[TRT]    Registered plugin creator - ::Split version 1
[TRT]    Registered plugin creator - ::SpecialSlice_TRT version 1
[TRT]    Registered plugin creator - ::InstanceNormalization_TRT version 1
[TRT]    detected model format - UFF  (extension '.uff')
[TRT]    desired precision specified for GPU: FASTEST
[TRT]    requested fasted precision for device GPU without providing valid calibrator, disabling INT8
[TRT]    [MemUsageChange] Init CUDA: CPU +203, GPU +0, now: CPU 227, GPU 3406 (MiB)
[TRT]    native precisions detected for GPU:  FP32, FP16
[TRT]    selecting fastest native precision for GPU:  FP16
[TRT]    attempting to open engine cache file /usr/local/bin/networks/SSD-Mobilenet-v2/ssd_mobilenet_v2_coco.uff.1.1.8001.GPU.FP16.engine
[TRT]    loading network plan from engine cache... /usr/local/bin/networks/SSD-Mobilenet-v2/ssd_mobilenet_v2_coco.uff.1.1.8001.GPU.FP16.engine
[TRT]    device GPU, loaded /usr/local/bin/networks/SSD-Mobilenet-v2/ssd_mobilenet_v2_coco.uff
[TRT]    [MemUsageChange] Init CUDA: CPU +0, GPU +0, now: CPU 261, GPU 3475 (MiB)
[TRT]    Loaded engine size: 34 MB
[TRT]    [MemUsageSnapshot] deserializeCudaEngine begin: CPU 261 MiB, GPU 3475 MiB
[TRT]    Using an engine plan file across different models of devices is not recommended and is likely to affect performance or even cause errors.
[TRT]    Using cublas a tactic source
[TRT]    [MemUsageChange] Init cuBLAS/cuBLASLt: CPU +158, GPU +245, now: CPU 437, GPU 3749 (MiB)
[TRT]    Using cuDNN as a tactic source
[TRT]    [MemUsageChange] Init cuDNN: CPU +241, GPU +145, now: CPU 678, GPU 3894 (MiB)
[TRT]    [MemUsageChange] Init cuBLAS/cuBLASLt: CPU +0, GPU +0, now: CPU 678, GPU 3894 (MiB)
[TRT]    Deserialization required 6304789 microseconds.
[TRT]    [MemUsageSnapshot] deserializeCudaEngine end: CPU 678 MiB, GPU 3894 MiB
[TRT]    [MemUsageSnapshot] ExecutionContext creation begin: CPU 678 MiB, GPU 3894 MiB
[TRT]    Using cublas a tactic source
[TRT]    [MemUsageChange] Init cuBLAS/cuBLASLt: CPU +0, GPU +0, now: CPU 678, GPU 3894 (MiB)
[TRT]    Using cuDNN as a tactic source
[TRT]    [MemUsageChange] Init cuDNN: CPU +0, GPU +0, now: CPU 678, GPU 3894 (MiB)
[TRT]    Total per-runner device memory is 22661632
[TRT]    Total per-runner host memory is 124640
[TRT]    Allocated activation device memory of size 14270976
[TRT]    [MemUsageSnapshot] ExecutionContext creation end: CPU 680 MiB, GPU 3892 MiB
[TRT]    
[TRT]    CUDA engine context initialized on device GPU:
[TRT]       -- layers       119
[TRT]       -- maxBatchSize 1
[TRT]       -- deviceMemory 14270976
[TRT]       -- bindings     3
[TRT]       binding 0
                -- index   0
                -- name    'Input'
                -- type    FP32
                -- in/out  INPUT
                -- # dims  3
                -- dim #0  3
                -- dim #1  300
                -- dim #2  300
[TRT]       binding 1
                -- index   1
                -- name    'NMS'
                -- type    FP32
                -- in/out  OUTPUT
                -- # dims  3
                -- dim #0  1
                -- dim #1  100
                -- dim #2  7
[TRT]       binding 2
                -- index   2
                -- name    'NMS_1'
                -- type    FP32
                -- in/out  OUTPUT
                -- # dims  3
                -- dim #0  1
                -- dim #1  1
                -- dim #2  1
[TRT]    
[TRT]    binding to input 0 Input  binding index:  0
[TRT]    binding to input 0 Input  dims (b=1 c=3 h=300 w=300) size=1080000
[TRT]    binding to output 0 NMS  binding index:  1
[TRT]    binding to output 0 NMS  dims (b=1 c=1 h=100 w=7) size=2800
[TRT]    binding to output 1 NMS_1  binding index:  2
[TRT]    binding to output 1 NMS_1  dims (b=1 c=1 h=1 w=1) size=4
[TRT]    
[TRT]    device GPU, /usr/local/bin/networks/SSD-Mobilenet-v2/ssd_mobilenet_v2_coco.uff initialized.
[TRT]    W = 7  H = 100  C = 1
[TRT]    detectNet -- maximum bounding boxes:  100
[TRT]    detectNet -- loaded 91 class info entries
[TRT]    detectNet -- number of object classes:  91
[gstreamer] initialized gstreamer, version 1.14.5.0
[gstreamer] gstCamera -- attempting to create device v4l2:///dev/video0
[gstreamer] gstCamera -- found v4l2 device: USB2.0-Camera
[gstreamer] v4l2-proplist, device.path=(string)/dev/video3, udev-probed=(boolean)false, device.api=(string)v4l2, v4l2.device.driver=(string)uvcvideo, v4l2.device.card=(string)USB2.0-Camera, v4l2.device.bus_info=(string)usb-70090000.xusb-2.2.4, v4l2.device.version=(uint)264701, v4l2.device.capabilities=(uint)2216689665, v4l2.device.device_caps=(uint)69206017;
[gstreamer] gstCamera -- found v4l2 device: SPCA2650 PC Camera
[gstreamer] v4l2-proplist, device.path=(string)/dev/video2, udev-probed=(boolean)false, device.api=(string)v4l2, v4l2.device.driver=(string)uvcvideo, v4l2.device.card=(string)"SPCA2650\ PC\ Camera", v4l2.device.bus_info=(string)usb-70090000.xusb-2.2.3, v4l2.device.version=(uint)264701, v4l2.device.capabilities=(uint)2216689665, v4l2.device.device_caps=(uint)69206017;
[gstreamer] gstCamera -- found v4l2 device: USB2.0-Camera
[gstreamer] v4l2-proplist, device.path=(string)/dev/video1, udev-probed=(boolean)false, device.api=(string)v4l2, v4l2.device.driver=(string)uvcvideo, v4l2.device.card=(string)USB2.0-Camera, v4l2.device.bus_info=(string)usb-70090000.xusb-2.2.2, v4l2.device.version=(uint)264701, v4l2.device.capabilities=(uint)2216689665, v4l2.device.device_caps=(uint)69206017;
[gstreamer] gstCamera -- found v4l2 device: HD Camera
[gstreamer] v4l2-proplist, device.path=(string)/dev/video0, udev-probed=(boolean)false, device.api=(string)v4l2, v4l2.device.driver=(string)uvcvideo, v4l2.device.card=(string)"HD\ Camera", v4l2.device.bus_info=(string)usb-70090000.xusb-2.2.1, v4l2.device.version=(uint)264701, v4l2.device.capabilities=(uint)2216689665, v4l2.device.device_caps=(uint)69206017;
[gstreamer] gstCamera -- found 12 caps for v4l2 device /dev/video0
[gstreamer] [0] video/x-raw, format=(string)YUY2, width=(int)1280, height=(int)1024, pixel-aspect-ratio=(fraction)1/1, framerate=(fraction)5/1;
[gstreamer] [1] video/x-raw, format=(string)YUY2, width=(int)1280, height=(int)960, pixel-aspect-ratio=(fraction)1/1, framerate=(fraction)5/1;
[gstreamer] [2] video/x-raw, format=(string)YUY2, width=(int)1280, height=(int)720, pixel-aspect-ratio=(fraction)1/1, framerate=(fraction)5/1;
[gstreamer] [3] video/x-raw, format=(string)YUY2, width=(int)640, height=(int)480, pixel-aspect-ratio=(fraction)1/1, framerate=(fraction){ 25/1, 20/1, 15/1, 10/1 };
[gstreamer] [4] video/x-raw, format=(string)YUY2, width=(int)640, height=(int)360, pixel-aspect-ratio=(fraction)1/1, framerate=(fraction){ 25/1, 20/1, 15/1, 10/1 };
[gstreamer] [5] video/x-raw, format=(string)YUY2, width=(int)320, height=(int)240, pixel-aspect-ratio=(fraction)1/1, framerate=(fraction){ 25/1, 20/1, 15/1, 10/1 };
[gstreamer] [6] image/jpeg, width=(int)1280, height=(int)1024, pixel-aspect-ratio=(fraction)1/1, framerate=(fraction){ 30/1, 25/1, 20/1, 15/1, 10/1 };
[gstreamer] [7] image/jpeg, width=(int)1280, height=(int)960, pixel-aspect-ratio=(fraction)1/1, framerate=(fraction){ 30/1, 25/1, 20/1, 15/1, 10/1 };
[gstreamer] [8] image/jpeg, width=(int)1280, height=(int)720, pixel-aspect-ratio=(fraction)1/1, framerate=(fraction){ 30/1, 25/1, 20/1, 15/1, 10/1 };
[gstreamer] [9] image/jpeg, width=(int)640, height=(int)480, pixel-aspect-ratio=(fraction)1/1, framerate=(fraction){ 30/1, 25/1, 20/1, 15/1, 10/1 };
[gstreamer] [10] image/jpeg, width=(int)640, height=(int)360, pixel-aspect-ratio=(fraction)1/1, framerate=(fraction){ 30/1, 25/1, 20/1, 15/1, 10/1 };
[gstreamer] [11] image/jpeg, width=(int)320, height=(int)240, pixel-aspect-ratio=(fraction)1/1, framerate=(fraction){ 30/1, 25/1, 20/1, 15/1, 10/1 };
[gstreamer] gstCamera -- selected device profile:  codec=mjpeg format=unknown width=1280 height=720
[gstreamer] gstCamera pipeline string:
[gstreamer] v4l2src device=/dev/video0 do-timestamp=true ! image/jpeg, width=(int)1280, height=(int)720 ! jpegdec ! video/x-raw ! appsink name=mysink
[gstreamer] gstCamera successfully created device v4l2:///dev/video0
[video]  created gstCamera from v4l2:///dev/video0
------------------------------------------------
gstCamera video options:
------------------------------------------------
  -- URI: v4l2:///dev/video0
     - protocol:  v4l2
     - location:  /dev/video0
  -- deviceType: v4l2
  -- ioType:     input
  -- codec:      mjpeg
  -- width:      1280
  -- height:     720
  -- frameRate:  30.000000
  -- bitRate:    0
  -- numBuffers: 4
  -- zeroCopy:   true
  -- flipMethod: none
  -- loop:       0
  -- rtspLatency 2000
------------------------------------------------
[gstreamer] gstCamera -- attempting to create device v4l2:///dev/video1
[gstreamer] gstCamera -- found v4l2 device: USB2.0-Camera
[gstreamer] v4l2-proplist, device.path=(string)/dev/video3, udev-probed=(boolean)false, device.api=(string)v4l2, v4l2.device.driver=(string)uvcvideo, v4l2.device.card=(string)USB2.0-Camera, v4l2.device.bus_info=(string)usb-70090000.xusb-2.2.4, v4l2.device.version=(uint)264701, v4l2.device.capabilities=(uint)2216689665, v4l2.device.device_caps=(uint)69206017;
[gstreamer] gstCamera -- found v4l2 device: SPCA2650 PC Camera
[gstreamer] v4l2-proplist, device.path=(string)/dev/video2, udev-probed=(boolean)false, device.api=(string)v4l2, v4l2.device.driver=(string)uvcvideo, v4l2.device.card=(string)"SPCA2650\ PC\ Camera", v4l2.device.bus_info=(string)usb-70090000.xusb-2.2.3, v4l2.device.version=(uint)264701, v4l2.device.capabilities=(uint)2216689665, v4l2.device.device_caps=(uint)69206017;
[gstreamer] gstCamera -- found v4l2 device: USB2.0-Camera
[gstreamer] v4l2-proplist, device.path=(string)/dev/video1, udev-probed=(boolean)false, device.api=(string)v4l2, v4l2.device.driver=(string)uvcvideo, v4l2.device.card=(string)USB2.0-Camera, v4l2.device.bus_info=(string)usb-70090000.xusb-2.2.2, v4l2.device.version=(uint)264701, v4l2.device.capabilities=(uint)2216689665, v4l2.device.device_caps=(uint)69206017;
[gstreamer] gstCamera -- found 8 caps for v4l2 device /dev/video1
[gstreamer] [0] video/x-raw, format=(string)YUY2, width=(int)1280, height=(int)720, pixel-aspect-ratio=(fraction)1/1, framerate=(fraction)5/1;
[gstreamer] [1] video/x-raw, format=(string)YUY2, width=(int)1280, height=(int)712, pixel-aspect-ratio=(fraction)1/1, framerate=(fraction)15/1;
[gstreamer] [2] video/x-raw, format=(string)YUY2, width=(int)640, height=(int)480, pixel-aspect-ratio=(fraction)1/1, framerate=(fraction)20/1;
[gstreamer] [3] video/x-raw, format=(string)YUY2, width=(int)640, height=(int)472, pixel-aspect-ratio=(fraction)1/1, framerate=(fraction)20/1;
[gstreamer] [4] image/jpeg, width=(int)1280, height=(int)720, pixel-aspect-ratio=(fraction)1/1, framerate=(fraction)15/1;
[gstreamer] [5] image/jpeg, width=(int)1280, height=(int)712, pixel-aspect-ratio=(fraction)1/1, framerate=(fraction)15/1;
[gstreamer] [6] image/jpeg, width=(int)640, height=(int)480, pixel-aspect-ratio=(fraction)1/1, framerate=(fraction)20/1;
[gstreamer] [7] image/jpeg, width=(int)640, height=(int)472, pixel-aspect-ratio=(fraction)1/1, framerate=(fraction)20/1;
[gstreamer] gstCamera -- selected device profile:  codec=mjpeg format=unknown width=1280 height=720
[gstreamer] gstCamera pipeline string:
[gstreamer] v4l2src device=/dev/video1 do-timestamp=true ! image/jpeg, width=(int)1280, height=(int)720 ! jpegdec ! video/x-raw ! appsink name=mysink
[gstreamer] gstCamera successfully created device v4l2:///dev/video1
[video]  created gstCamera from v4l2:///dev/video1
------------------------------------------------
gstCamera video options:
------------------------------------------------
  -- URI: v4l2:///dev/video1
     - protocol:  v4l2
     - location:  /dev/video1
     - port:      1
  -- deviceType: v4l2
  -- ioType:     input
  -- codec:      mjpeg
  -- width:      1280
  -- height:     720
  -- frameRate:  15.000000
  -- bitRate:    0
  -- numBuffers: 4
  -- zeroCopy:   true
  -- flipMethod: none
  -- loop:       0
  -- rtspLatency 2000
------------------------------------------------
[gstreamer] gstCamera -- attempting to create device v4l2:///dev/video2
[gstreamer] gstCamera -- found v4l2 device: USB2.0-Camera
[gstreamer] v4l2-proplist, device.path=(string)/dev/video3, udev-probed=(boolean)false, device.api=(string)v4l2, v4l2.device.driver=(string)uvcvideo, v4l2.device.card=(string)USB2.0-Camera, v4l2.device.bus_info=(string)usb-70090000.xusb-2.2.4, v4l2.device.version=(uint)264701, v4l2.device.capabilities=(uint)2216689665, v4l2.device.device_caps=(uint)69206017;
[gstreamer] gstCamera -- found v4l2 device: SPCA2650 PC Camera
[gstreamer] v4l2-proplist, device.path=(string)/dev/video2, udev-probed=(boolean)false, device.api=(string)v4l2, v4l2.device.driver=(string)uvcvideo, v4l2.device.card=(string)"SPCA2650\ PC\ Camera", v4l2.device.bus_info=(string)usb-70090000.xusb-2.2.3, v4l2.device.version=(uint)264701, v4l2.device.capabilities=(uint)2216689665, v4l2.device.device_caps=(uint)69206017;
[gstreamer] gstCamera -- found 10 caps for v4l2 device /dev/video2
[gstreamer] [0] video/x-raw, format=(string)YUY2, width=(int)1280, height=(int)720, pixel-aspect-ratio=(fraction)1/1, framerate=(fraction)10/1;
[gstreamer] [1] video/x-raw, format=(string)YUY2, width=(int)1280, height=(int)712, pixel-aspect-ratio=(fraction)1/1, framerate=(fraction)10/1;
[gstreamer] [2] video/x-raw, format=(string)YUY2, width=(int)1280, height=(int)480, pixel-aspect-ratio=(fraction)1/1, framerate=(fraction)10/1;
[gstreamer] [3] video/x-raw, format=(string)YUY2, width=(int)640, height=(int)480, pixel-aspect-ratio=(fraction)1/1, framerate=(fraction)30/1;
[gstreamer] [4] video/x-raw, format=(string)YUY2, width=(int)640, height=(int)472, pixel-aspect-ratio=(fraction)1/1, framerate=(fraction)30/1;
[gstreamer] [5] image/jpeg, width=(int)1280, height=(int)720, pixel-aspect-ratio=(fraction)1/1, framerate=(fraction)15/1;
[gstreamer] [6] image/jpeg, width=(int)1280, height=(int)712, pixel-aspect-ratio=(fraction)1/1, framerate=(fraction)15/1;
[gstreamer] [7] image/jpeg, width=(int)1280, height=(int)480, pixel-aspect-ratio=(fraction)1/1, framerate=(fraction)20/1;
[gstreamer] [8] image/jpeg, width=(int)640, height=(int)480, pixel-aspect-ratio=(fraction)1/1, framerate=(fraction)30/1;
[gstreamer] [9] image/jpeg, width=(int)640, height=(int)472, pixel-aspect-ratio=(fraction)1/1, framerate=(fraction)30/1;
[gstreamer] gstCamera -- selected device profile:  codec=mjpeg format=unknown width=1280 height=720
[gstreamer] gstCamera pipeline string:
[gstreamer] v4l2src device=/dev/video2 do-timestamp=true ! image/jpeg, width=(int)1280, height=(int)720 ! jpegdec ! video/x-raw ! appsink name=mysink
[gstreamer] gstCamera successfully created device v4l2:///dev/video2
[video]  created gstCamera from v4l2:///dev/video2
------------------------------------------------
gstCamera video options:
------------------------------------------------
  -- URI: v4l2:///dev/video2
     - protocol:  v4l2
     - location:  /dev/video2
     - port:      2
  -- deviceType: v4l2
  -- ioType:     input
  -- codec:      mjpeg
  -- width:      1280
  -- height:     720
  -- frameRate:  15.000000
  -- bitRate:    0
  -- numBuffers: 4
  -- zeroCopy:   true
  -- flipMethod: none
  -- loop:       0
  -- rtspLatency 2000
------------------------------------------------
[gstreamer] gstCamera -- attempting to create device v4l2:///dev/video3
[gstreamer] gstCamera -- found v4l2 device: USB2.0-Camera
[gstreamer] v4l2-proplist, device.path=(string)/dev/video3, udev-probed=(boolean)false, device.api=(string)v4l2, v4l2.device.driver=(string)uvcvideo, v4l2.device.card=(string)USB2.0-Camera, v4l2.device.bus_info=(string)usb-70090000.xusb-2.2.4, v4l2.device.version=(uint)264701, v4l2.device.capabilities=(uint)2216689665, v4l2.device.device_caps=(uint)69206017;
[gstreamer] gstCamera -- found 8 caps for v4l2 device /dev/video3
[gstreamer] [0] video/x-raw, format=(string)YUY2, width=(int)1280, height=(int)720, pixel-aspect-ratio=(fraction)1/1, framerate=(fraction)5/1;
[gstreamer] [1] video/x-raw, format=(string)YUY2, width=(int)1280, height=(int)712, pixel-aspect-ratio=(fraction)1/1, framerate=(fraction)15/1;
[gstreamer] [2] video/x-raw, format=(string)YUY2, width=(int)640, height=(int)480, pixel-aspect-ratio=(fraction)1/1, framerate=(fraction)20/1;
[gstreamer] [3] video/x-raw, format=(string)YUY2, width=(int)640, height=(int)472, pixel-aspect-ratio=(fraction)1/1, framerate=(fraction)20/1;
[gstreamer] [4] image/jpeg, width=(int)1280, height=(int)720, pixel-aspect-ratio=(fraction)1/1, framerate=(fraction)15/1;
[gstreamer] [5] image/jpeg, width=(int)1280, height=(int)712, pixel-aspect-ratio=(fraction)1/1, framerate=(fraction)15/1;
[gstreamer] [6] image/jpeg, width=(int)640, height=(int)480, pixel-aspect-ratio=(fraction)1/1, framerate=(fraction)20/1;
[gstreamer] [7] image/jpeg, width=(int)640, height=(int)472, pixel-aspect-ratio=(fraction)1/1, framerate=(fraction)20/1;
[gstreamer] gstCamera -- selected device profile:  codec=mjpeg format=unknown width=1280 height=720
[gstreamer] gstCamera pipeline string:
[gstreamer] v4l2src device=/dev/video3 do-timestamp=true ! image/jpeg, width=(int)1280, height=(int)720 ! jpegdec ! video/x-raw ! appsink name=mysink
[gstreamer] gstCamera successfully created device v4l2:///dev/video3
[video]  created gstCamera from v4l2:///dev/video3
------------------------------------------------
gstCamera video options:
------------------------------------------------
  -- URI: v4l2:///dev/video3
     - protocol:  v4l2
     - location:  /dev/video3
     - port:      3
  -- deviceType: v4l2
  -- ioType:     input
  -- codec:      mjpeg
  -- width:      1280
  -- height:     720
  -- frameRate:  15.000000
  -- bitRate:    0
  -- numBuffers: 4
  -- zeroCopy:   true
  -- flipMethod: none
  -- loop:       0
  -- rtspLatency 2000
------------------------------------------------
[OpenGL] glDisplay -- X screen 0 resolution:  1920x1080
[OpenGL] glDisplay -- X window resolution:    1920x1080
[OpenGL] glDisplay -- display device initialized (1920x1080)
[video]  created glDisplay from display://0
------------------------------------------------
glDisplay video options:
------------------------------------------------
  -- URI: display://0
     - protocol:  display
     - location:  0
  -- deviceType: display
  -- ioType:     output
  -- codec:      raw
  -- width:      1920
  -- height:     1080
  -- frameRate:  0.000000
  -- bitRate:    0
  -- numBuffers: 4
  -- zeroCopy:   true
  -- flipMethod: none
  -- loop:       0
  -- rtspLatency 2000
------------------------------------------------
[gstreamer] opening gstCamera for streaming, transitioning pipeline to GST_STATE_PLAYING
[gstreamer] gstreamer changed state from NULL to READY ==> mysink
[gstreamer] gstreamer changed state from NULL to READY ==> capsfilter1
[gstreamer] gstreamer changed state from NULL to READY ==> jpegdec0
[gstreamer] gstreamer changed state from NULL to READY ==> capsfilter0
[gstreamer] gstreamer changed state from NULL to READY ==> v4l2src0
[gstreamer] gstreamer changed state from NULL to READY ==> pipeline0
[gstreamer] gstreamer changed state from READY to PAUSED ==> capsfilter1
[gstreamer] gstreamer changed state from READY to PAUSED ==> jpegdec0
[gstreamer] gstreamer changed state from READY to PAUSED ==> capsfilter0
[gstreamer] gstreamer stream status CREATE ==> src
[gstreamer] gstreamer changed state from READY to PAUSED ==> v4l2src0
[gstreamer] gstreamer changed state from READY to PAUSED ==> pipeline0
[gstreamer] gstreamer message new-clock ==> pipeline0
[gstreamer] gstreamer stream status ENTER ==> src
[gstreamer] gstreamer changed state from PAUSED to PLAYING ==> capsfilter1
[gstreamer] gstreamer changed state from PAUSED to PLAYING ==> jpegdec0
[gstreamer] gstreamer changed state from PAUSED to PLAYING ==> capsfilter0
[gstreamer] gstreamer message stream-start ==> pipeline0
[gstreamer] gstreamer changed state from PAUSED to PLAYING ==> v4l2src0
[gstreamer] gstCamera -- onPreroll
[gstreamer] gstBufferManager -- map buffer size was less than max size (1382400 vs 1382407)
[gstreamer] gstBufferManager recieve caps:  video/x-raw, format=(string)I420, width=(int)1280, height=(int)720, interlace-mode=(string)progressive, multiview-mode=(string)mono, multiview-flags=(GstVideoMultiviewFlagsSet)0:ffffffff:/right-view-first/left-flipped/left-flopped/right-flipped/right-flopped/half-aspect/mixed-mono, pixel-aspect-ratio=(fraction)1/1, chroma-site=(string)mpeg2, colorimetry=(string)1:4:0:0, framerate=(fraction)30/1
[gstreamer] gstBufferManager -- recieved first frame, codec=mjpeg format=i420 width=1280 height=720 size=1382407
RingBuffer -- allocated 4 buffers (1382407 bytes each, 5529628 bytes total)
[gstreamer] gstreamer changed state from READY to PAUSED ==> mysink
[gstreamer] gstreamer message async-done ==> pipeline0
[gstreamer] gstreamer changed state from PAUSED to PLAYING ==> mysink
[gstreamer] gstreamer changed state from PAUSED to PLAYING ==> pipeline0
RingBuffer -- allocated 4 buffers (2764800 bytes each, 11059200 bytes total)
[OpenGL] glDisplay -- set the window size to 1280x720
[OpenGL] creating 1280x720 texture (GL_RGB8 format, 2764800 bytes)
[cuda]   registered openGL texture for interop access (1280x720, GL_RGB8, 2764800 bytes)
[gstreamer] opening gstCamera for streaming, transitioning pipeline to GST_STATE_PLAYING
[gstreamer] gstreamer changed state from NULL to READY ==> mysink
[gstreamer] gstreamer changed state from NULL to READY ==> capsfilter3
[gstreamer] gstreamer changed state from NULL to READY ==> jpegdec1
[gstreamer] gstreamer changed state from NULL to READY ==> capsfilter2
[gstreamer] gstreamer changed state from NULL to READY ==> v4l2src1
[gstreamer] gstreamer changed state from NULL to READY ==> pipeline1
[gstreamer] gstreamer changed state from READY to PAUSED ==> capsfilter3
[gstreamer] gstreamer changed state from READY to PAUSED ==> jpegdec1
[gstreamer] gstreamer changed state from READY to PAUSED ==> capsfilter2
[gstreamer] gstreamer stream status CREATE ==> src
[gstreamer] gstreamer changed state from READY to PAUSED ==> v4l2src1
[gstreamer] gstreamer changed state from READY to PAUSED ==> pipeline1
[gstreamer] gstreamer message new-clock ==> pipeline1
[gstreamer] gstreamer stream status ENTER ==> src
[gstreamer] gstreamer changed state from PAUSED to PLAYING ==> capsfilter3
[gstreamer] gstreamer changed state from PAUSED to PLAYING ==> jpegdec1
[gstreamer] gstreamer changed state from PAUSED to PLAYING ==> capsfilter2
[gstreamer] gstreamer changed state from PAUSED to PLAYING ==> v4l2src1
[gstreamer] gstreamer message stream-start ==> pipeline1
[gstreamer] gstCamera -- onPreroll
[gstreamer] gstBufferManager -- map buffer size was less than max size (1382400 vs 1382407)
[gstreamer] gstBufferManager recieve caps:  video/x-raw, format=(string)I420, width=(int)1280, height=(int)720, interlace-mode=(string)progressive, multiview-mode=(string)mono, multiview-flags=(GstVideoMultiviewFlagsSet)0:ffffffff:/right-view-first/left-flipped/left-flopped/right-flipped/right-flopped/half-aspect/mixed-mono, pixel-aspect-ratio=(fraction)1/1, chroma-site=(string)mpeg2, colorimetry=(string)1:4:0:0, framerate=(fraction)15/1
[gstreamer] gstBufferManager -- recieved first frame, codec=mjpeg format=i420 width=1280 height=720 size=1382407
RingBuffer -- allocated 4 buffers (1382407 bytes each, 5529628 bytes total)
[gstreamer] gstreamer changed state from READY to PAUSED ==> mysink
[gstreamer] gstreamer message async-done ==> pipeline1
[gstreamer] gstreamer changed state from PAUSED to PLAYING ==> mysink
[gstreamer] gstreamer changed state from PAUSED to PLAYING ==> pipeline1
RingBuffer -- allocated 4 buffers (2764800 bytes each, 11059200 bytes total)
[gstreamer] opening gstCamera for streaming, transitioning pipeline to GST_STATE_PLAYING
[gstreamer] gstreamer changed state from NULL to READY ==> mysink
[gstreamer] gstreamer changed state from NULL to READY ==> capsfilter5
[gstreamer] gstreamer changed state from NULL to READY ==> jpegdec2
[gstreamer] gstreamer changed state from NULL to READY ==> capsfilter4
[gstreamer] gstreamer changed state from NULL to READY ==> v4l2src2
[gstreamer] gstreamer changed state from NULL to READY ==> pipeline2
[gstreamer] gstreamer changed state from READY to PAUSED ==> capsfilter5
[gstreamer] gstreamer changed state from READY to PAUSED ==> jpegdec2
[gstreamer] gstreamer changed state from READY to PAUSED ==> capsfilter4
[gstreamer] gstreamer stream status CREATE ==> src
[gstreamer] gstreamer changed state from READY to PAUSED ==> v4l2src2
[gstreamer] gstreamer changed state from READY to PAUSED ==> pipeline2
[gstreamer] gstreamer message new-clock ==> pipeline2
[gstreamer] gstreamer changed state from PAUSED to PLAYING ==> capsfilter5
[gstreamer] gstreamer changed state from PAUSED to PLAYING ==> jpegdec2
[gstreamer] gstreamer stream status ENTER ==> src
[gstreamer] gstreamer changed state from PAUSED to PLAYING ==> capsfilter4
[gstreamer] gstreamer changed state from PAUSED to PLAYING ==> v4l2src2
[gstreamer] gstreamer message stream-start ==> pipeline2
[gstreamer] gstCamera -- end of stream (EOS)
[gstreamer] gstreamer v4l2src2 ERROR Failed to allocate required memory.
[gstreamer] gstreamer Debugging info: gstv4l2src.c(658): gst_v4l2src_decide_allocation (): /GstPipeline:pipeline2/GstV4l2Src:v4l2src2:
Buffer pool activation failed
[gstreamer] gstreamer v4l2src2 ERROR Internal data stream error.
[gstreamer] gstreamer Debugging info: gstbasesrc.c(3055): gst_base_src_loop (): /GstPipeline:pipeline2/GstV4l2Src:v4l2src2:
streaming stopped, reason not-negotiated (-4)
[gstreamer] gstreamer changed state from READY to PAUSED ==> mysink

AK51 · July 27, 2022, 2:44am

And I tried to set to 320x240 of each web cam, but it stuck also…
python3 cam4.py --input-width=320 --input-height=240

import jetson.inference
import jetson.utils
import sys
net = jetson.inference.detectNet("ssd-mobilenet-v2", threshold=0.5)
argv="--input-width=320 --input-height=240"
camera0 = jetson.utils.videoSource("/dev/video0", argv=sys.argv)
camera1 = jetson.utils.videoSource("/dev/video1", argv=sys.argv)
camera2 = jetson.utils.videoSource("/dev/video2", argv=sys.argv)
camera3 = jetson.utils.videoSource("/dev/video3", argv=sys.argv)
display = jetson.utils.videoOutput("display://0") # 'my_video.mp4' for file
i = 0

while display.IsStreaming():
	if(i==0):
		img = camera0.Capture()
	elif(i==1):
		img = camera1.Capture()
	elif(i==2):
		img = camera2.Capture()
	elif(i==3):
		img = camera3.Capture()
	if(i>=3):
		i = 0
	else:
		i=i+1
	detections = net.Detect(img)
	display.Render(img)
	display.SetStatus("Object Detection | Network {:.0f} FPS".format(net.GetNetworkFPS()))

python3 cam4.py --input-width=320 --input-height=240
jetson.inference -- detectNet loading build-in network 'ssd-mobilenet-v2'

detectNet -- loading detection network model from:
          -- model        networks/SSD-Mobilenet-v2/ssd_mobilenet_v2_coco.uff
          -- input_blob   'Input'
          -- output_blob  'NMS'
          -- output_count 'NMS_1'
          -- class_labels networks/SSD-Mobilenet-v2/ssd_coco_labels.txt
          -- threshold    0.500000
          -- batch_size   1

[TRT]    TensorRT version 8.0.1
[TRT]    loading NVIDIA plugins...
[TRT]    Registered plugin creator - ::GridAnchor_TRT version 1
[TRT]    Registered plugin creator - ::GridAnchorRect_TRT version 1
[TRT]    Registered plugin creator - ::NMS_TRT version 1
[TRT]    Registered plugin creator - ::Reorg_TRT version 1
[TRT]    Registered plugin creator - ::Region_TRT version 1
[TRT]    Registered plugin creator - ::Clip_TRT version 1
[TRT]    Registered plugin creator - ::LReLU_TRT version 1
[TRT]    Registered plugin creator - ::PriorBox_TRT version 1
[TRT]    Registered plugin creator - ::Normalize_TRT version 1
[TRT]    Registered plugin creator - ::ScatterND version 1
[TRT]    Registered plugin creator - ::RPROI_TRT version 1
[TRT]    Registered plugin creator - ::BatchedNMS_TRT version 1
[TRT]    Registered plugin creator - ::BatchedNMSDynamic_TRT version 1
[TRT]    Could not register plugin creator -  ::FlattenConcat_TRT version 1
[TRT]    Registered plugin creator - ::CropAndResize version 1
[TRT]    Registered plugin creator - ::DetectionLayer_TRT version 1
[TRT]    Registered plugin creator - ::EfficientNMS_ONNX_TRT version 1
[TRT]    Registered plugin creator - ::EfficientNMS_TRT version 1
[TRT]    Registered plugin creator - ::Proposal version 1
[TRT]    Registered plugin creator - ::ProposalLayer_TRT version 1
[TRT]    Registered plugin creator - ::PyramidROIAlign_TRT version 1
[TRT]    Registered plugin creator - ::ResizeNearest_TRT version 1
[TRT]    Registered plugin creator - ::Split version 1
[TRT]    Registered plugin creator - ::SpecialSlice_TRT version 1
[TRT]    Registered plugin creator - ::InstanceNormalization_TRT version 1
[TRT]    detected model format - UFF  (extension '.uff')
[TRT]    desired precision specified for GPU: FASTEST
[TRT]    requested fasted precision for device GPU without providing valid calibrator, disabling INT8
[TRT]    [MemUsageChange] Init CUDA: CPU +203, GPU +0, now: CPU 227, GPU 3475 (MiB)
[TRT]    native precisions detected for GPU:  FP32, FP16
[TRT]    selecting fastest native precision for GPU:  FP16
[TRT]    attempting to open engine cache file /usr/local/bin/networks/SSD-Mobilenet-v2/ssd_mobilenet_v2_coco.uff.1.1.8001.GPU.FP16.engine
[TRT]    loading network plan from engine cache... /usr/local/bin/networks/SSD-Mobilenet-v2/ssd_mobilenet_v2_coco.uff.1.1.8001.GPU.FP16.engine
[TRT]    device GPU, loaded /usr/local/bin/networks/SSD-Mobilenet-v2/ssd_mobilenet_v2_coco.uff
[TRT]    [MemUsageChange] Init CUDA: CPU +0, GPU +0, now: CPU 261, GPU 3509 (MiB)
[TRT]    Loaded engine size: 34 MB
[TRT]    [MemUsageSnapshot] deserializeCudaEngine begin: CPU 261 MiB, GPU 3509 MiB
[TRT]    Using an engine plan file across different models of devices is not recommended and is likely to affect performance or even cause errors.
[TRT]    Using cublas a tactic source
[TRT]    [MemUsageChange] Init cuBLAS/cuBLASLt: CPU +158, GPU +163, now: CPU 437, GPU 3691 (MiB)
[TRT]    Using cuDNN as a tactic source
[TRT]    [MemUsageChange] Init cuDNN: CPU +241, GPU +184, now: CPU 678, GPU 3875 (MiB)
[TRT]    [MemUsageChange] Init cuBLAS/cuBLASLt: CPU +0, GPU -1, now: CPU 678, GPU 3875 (MiB)
[TRT]    Deserialization required 2864618 microseconds.
[TRT]    [MemUsageSnapshot] deserializeCudaEngine end: CPU 678 MiB, GPU 3875 MiB
[TRT]    [MemUsageSnapshot] ExecutionContext creation begin: CPU 678 MiB, GPU 3875 MiB
[TRT]    Using cublas a tactic source
[TRT]    [MemUsageChange] Init cuBLAS/cuBLASLt: CPU +0, GPU +0, now: CPU 678, GPU 3875 (MiB)
[TRT]    Using cuDNN as a tactic source
[TRT]    [MemUsageChange] Init cuDNN: CPU +0, GPU +0, now: CPU 678, GPU 3875 (MiB)
[TRT]    Total per-runner device memory is 22661632
[TRT]    Total per-runner host memory is 124640
[TRT]    Allocated activation device memory of size 14270976
[TRT]    [MemUsageSnapshot] ExecutionContext creation end: CPU 680 MiB, GPU 3882 MiB
[TRT]    
[TRT]    CUDA engine context initialized on device GPU:
[TRT]       -- layers       119
[TRT]       -- maxBatchSize 1
[TRT]       -- deviceMemory 14270976
[TRT]       -- bindings     3
[TRT]       binding 0
                -- index   0
                -- name    'Input'
                -- type    FP32
                -- in/out  INPUT
                -- # dims  3
                -- dim #0  3
                -- dim #1  300
                -- dim #2  300
[TRT]       binding 1
                -- index   1
                -- name    'NMS'
                -- type    FP32
                -- in/out  OUTPUT
                -- # dims  3
                -- dim #0  1
                -- dim #1  100
                -- dim #2  7
[TRT]       binding 2
                -- index   2
                -- name    'NMS_1'
                -- type    FP32
                -- in/out  OUTPUT
                -- # dims  3
                -- dim #0  1
                -- dim #1  1
                -- dim #2  1
[TRT]    
[TRT]    binding to input 0 Input  binding index:  0
[TRT]    binding to input 0 Input  dims (b=1 c=3 h=300 w=300) size=1080000
[TRT]    binding to output 0 NMS  binding index:  1
[TRT]    binding to output 0 NMS  dims (b=1 c=1 h=100 w=7) size=2800
[TRT]    binding to output 1 NMS_1  binding index:  2
[TRT]    binding to output 1 NMS_1  dims (b=1 c=1 h=1 w=1) size=4
[TRT]    
[TRT]    device GPU, /usr/local/bin/networks/SSD-Mobilenet-v2/ssd_mobilenet_v2_coco.uff initialized.
[TRT]    W = 7  H = 100  C = 1
[TRT]    detectNet -- maximum bounding boxes:  100
[TRT]    detectNet -- loaded 91 class info entries
[TRT]    detectNet -- number of object classes:  91
[gstreamer] initialized gstreamer, version 1.14.5.0
[gstreamer] gstCamera -- attempting to create device v4l2:///dev/video0
[gstreamer] gstCamera -- found v4l2 device: USB2.0-Camera
[gstreamer] v4l2-proplist, device.path=(string)/dev/video3, udev-probed=(boolean)false, device.api=(string)v4l2, v4l2.device.driver=(string)uvcvideo, v4l2.device.card=(string)USB2.0-Camera, v4l2.device.bus_info=(string)usb-70090000.xusb-2.2.4, v4l2.device.version=(uint)264701, v4l2.device.capabilities=(uint)2216689665, v4l2.device.device_caps=(uint)69206017;
[gstreamer] gstCamera -- found v4l2 device: SPCA2650 PC Camera
[gstreamer] v4l2-proplist, device.path=(string)/dev/video2, udev-probed=(boolean)false, device.api=(string)v4l2, v4l2.device.driver=(string)uvcvideo, v4l2.device.card=(string)"SPCA2650\ PC\ Camera", v4l2.device.bus_info=(string)usb-70090000.xusb-2.2.3, v4l2.device.version=(uint)264701, v4l2.device.capabilities=(uint)2216689665, v4l2.device.device_caps=(uint)69206017;
[gstreamer] gstCamera -- found v4l2 device: USB2.0-Camera
[gstreamer] v4l2-proplist, device.path=(string)/dev/video1, udev-probed=(boolean)false, device.api=(string)v4l2, v4l2.device.driver=(string)uvcvideo, v4l2.device.card=(string)USB2.0-Camera, v4l2.device.bus_info=(string)usb-70090000.xusb-2.2.2, v4l2.device.version=(uint)264701, v4l2.device.capabilities=(uint)2216689665, v4l2.device.device_caps=(uint)69206017;
[gstreamer] gstCamera -- found v4l2 device: HD Camera
[gstreamer] v4l2-proplist, device.path=(string)/dev/video0, udev-probed=(boolean)false, device.api=(string)v4l2, v4l2.device.driver=(string)uvcvideo, v4l2.device.card=(string)"HD\ Camera", v4l2.device.bus_info=(string)usb-70090000.xusb-2.2.1, v4l2.device.version=(uint)264701, v4l2.device.capabilities=(uint)2216689665, v4l2.device.device_caps=(uint)69206017;
[gstreamer] gstCamera -- found 12 caps for v4l2 device /dev/video0
[gstreamer] [0] video/x-raw, format=(string)YUY2, width=(int)1280, height=(int)1024, pixel-aspect-ratio=(fraction)1/1, framerate=(fraction)5/1;
[gstreamer] [1] video/x-raw, format=(string)YUY2, width=(int)1280, height=(int)960, pixel-aspect-ratio=(fraction)1/1, framerate=(fraction)5/1;
[gstreamer] [2] video/x-raw, format=(string)YUY2, width=(int)1280, height=(int)720, pixel-aspect-ratio=(fraction)1/1, framerate=(fraction)5/1;
[gstreamer] [3] video/x-raw, format=(string)YUY2, width=(int)640, height=(int)480, pixel-aspect-ratio=(fraction)1/1, framerate=(fraction){ 25/1, 20/1, 15/1, 10/1 };
[gstreamer] [4] video/x-raw, format=(string)YUY2, width=(int)640, height=(int)360, pixel-aspect-ratio=(fraction)1/1, framerate=(fraction){ 25/1, 20/1, 15/1, 10/1 };
[gstreamer] [5] video/x-raw, format=(string)YUY2, width=(int)320, height=(int)240, pixel-aspect-ratio=(fraction)1/1, framerate=(fraction){ 25/1, 20/1, 15/1, 10/1 };
[gstreamer] [6] image/jpeg, width=(int)1280, height=(int)1024, pixel-aspect-ratio=(fraction)1/1, framerate=(fraction){ 30/1, 25/1, 20/1, 15/1, 10/1 };
[gstreamer] [7] image/jpeg, width=(int)1280, height=(int)960, pixel-aspect-ratio=(fraction)1/1, framerate=(fraction){ 30/1, 25/1, 20/1, 15/1, 10/1 };
[gstreamer] [8] image/jpeg, width=(int)1280, height=(int)720, pixel-aspect-ratio=(fraction)1/1, framerate=(fraction){ 30/1, 25/1, 20/1, 15/1, 10/1 };
[gstreamer] [9] image/jpeg, width=(int)640, height=(int)480, pixel-aspect-ratio=(fraction)1/1, framerate=(fraction){ 30/1, 25/1, 20/1, 15/1, 10/1 };
[gstreamer] [10] image/jpeg, width=(int)640, height=(int)360, pixel-aspect-ratio=(fraction)1/1, framerate=(fraction){ 30/1, 25/1, 20/1, 15/1, 10/1 };
[gstreamer] [11] image/jpeg, width=(int)320, height=(int)240, pixel-aspect-ratio=(fraction)1/1, framerate=(fraction){ 30/1, 25/1, 20/1, 15/1, 10/1 };
[gstreamer] gstCamera -- selected device profile:  codec=mjpeg format=unknown width=320 height=240
[gstreamer] gstCamera pipeline string:
[gstreamer] v4l2src device=/dev/video0 do-timestamp=true ! image/jpeg, width=(int)320, height=(int)240 ! jpegdec ! video/x-raw ! appsink name=mysink
[gstreamer] gstCamera successfully created device v4l2:///dev/video0
[video]  created gstCamera from v4l2:///dev/video0
------------------------------------------------
gstCamera video options:
------------------------------------------------
  -- URI: v4l2:///dev/video0
     - protocol:  v4l2
     - location:  /dev/video0
  -- deviceType: v4l2
  -- ioType:     input
  -- codec:      mjpeg
  -- width:      320
  -- height:     240
  -- frameRate:  30.000000
  -- bitRate:    0
  -- numBuffers: 4
  -- zeroCopy:   true
  -- flipMethod: none
  -- loop:       0
  -- rtspLatency 2000
------------------------------------------------
[gstreamer] gstCamera -- attempting to create device v4l2:///dev/video1
[gstreamer] gstCamera -- found v4l2 device: USB2.0-Camera
[gstreamer] v4l2-proplist, device.path=(string)/dev/video3, udev-probed=(boolean)false, device.api=(string)v4l2, v4l2.device.driver=(string)uvcvideo, v4l2.device.card=(string)USB2.0-Camera, v4l2.device.bus_info=(string)usb-70090000.xusb-2.2.4, v4l2.device.version=(uint)264701, v4l2.device.capabilities=(uint)2216689665, v4l2.device.device_caps=(uint)69206017;
[gstreamer] gstCamera -- found v4l2 device: SPCA2650 PC Camera
[gstreamer] v4l2-proplist, device.path=(string)/dev/video2, udev-probed=(boolean)false, device.api=(string)v4l2, v4l2.device.driver=(string)uvcvideo, v4l2.device.card=(string)"SPCA2650\ PC\ Camera", v4l2.device.bus_info=(string)usb-70090000.xusb-2.2.3, v4l2.device.version=(uint)264701, v4l2.device.capabilities=(uint)2216689665, v4l2.device.device_caps=(uint)69206017;
[gstreamer] gstCamera -- found v4l2 device: USB2.0-Camera
[gstreamer] v4l2-proplist, device.path=(string)/dev/video1, udev-probed=(boolean)false, device.api=(string)v4l2, v4l2.device.driver=(string)uvcvideo, v4l2.device.card=(string)USB2.0-Camera, v4l2.device.bus_info=(string)usb-70090000.xusb-2.2.2, v4l2.device.version=(uint)264701, v4l2.device.capabilities=(uint)2216689665, v4l2.device.device_caps=(uint)69206017;
[gstreamer] gstCamera -- found 8 caps for v4l2 device /dev/video1
[gstreamer] [0] video/x-raw, format=(string)YUY2, width=(int)1280, height=(int)720, pixel-aspect-ratio=(fraction)1/1, framerate=(fraction)5/1;
[gstreamer] [1] video/x-raw, format=(string)YUY2, width=(int)1280, height=(int)712, pixel-aspect-ratio=(fraction)1/1, framerate=(fraction)15/1;
[gstreamer] [2] video/x-raw, format=(string)YUY2, width=(int)640, height=(int)480, pixel-aspect-ratio=(fraction)1/1, framerate=(fraction)20/1;
[gstreamer] [3] video/x-raw, format=(string)YUY2, width=(int)640, height=(int)472, pixel-aspect-ratio=(fraction)1/1, framerate=(fraction)20/1;
[gstreamer] [4] image/jpeg, width=(int)1280, height=(int)720, pixel-aspect-ratio=(fraction)1/1, framerate=(fraction)15/1;
[gstreamer] [5] image/jpeg, width=(int)1280, height=(int)712, pixel-aspect-ratio=(fraction)1/1, framerate=(fraction)15/1;
[gstreamer] [6] image/jpeg, width=(int)640, height=(int)480, pixel-aspect-ratio=(fraction)1/1, framerate=(fraction)20/1;
[gstreamer] [7] image/jpeg, width=(int)640, height=(int)472, pixel-aspect-ratio=(fraction)1/1, framerate=(fraction)20/1;
[gstreamer] gstCamera -- selected device profile:  codec=raw format=yuyv width=640 height=472
[gstreamer] gstCamera pipeline string:
[gstreamer] v4l2src device=/dev/video1 do-timestamp=true ! video/x-raw, format=(string)YUY2, width=(int)640, height=(int)472 ! appsink name=mysink
[gstreamer] gstCamera successfully created device v4l2:///dev/video1
[video]  created gstCamera from v4l2:///dev/video1
------------------------------------------------
gstCamera video options:
------------------------------------------------
  -- URI: v4l2:///dev/video1
     - protocol:  v4l2
     - location:  /dev/video1
     - port:      1
  -- deviceType: v4l2
  -- ioType:     input
  -- codec:      raw
  -- width:      640
  -- height:     472
  -- frameRate:  20.000000
  -- bitRate:    0
  -- numBuffers: 4
  -- zeroCopy:   true
  -- flipMethod: none
  -- loop:       0
  -- rtspLatency 2000
------------------------------------------------
[gstreamer] gstCamera -- attempting to create device v4l2:///dev/video2
[gstreamer] gstCamera -- found v4l2 device: USB2.0-Camera
[gstreamer] v4l2-proplist, device.path=(string)/dev/video3, udev-probed=(boolean)false, device.api=(string)v4l2, v4l2.device.driver=(string)uvcvideo, v4l2.device.card=(string)USB2.0-Camera, v4l2.device.bus_info=(string)usb-70090000.xusb-2.2.4, v4l2.device.version=(uint)264701, v4l2.device.capabilities=(uint)2216689665, v4l2.device.device_caps=(uint)69206017;
[gstreamer] gstCamera -- found v4l2 device: SPCA2650 PC Camera
[gstreamer] v4l2-proplist, device.path=(string)/dev/video2, udev-probed=(boolean)false, device.api=(string)v4l2, v4l2.device.driver=(string)uvcvideo, v4l2.device.card=(string)"SPCA2650\ PC\ Camera", v4l2.device.bus_info=(string)usb-70090000.xusb-2.2.3, v4l2.device.version=(uint)264701, v4l2.device.capabilities=(uint)2216689665, v4l2.device.device_caps=(uint)69206017;
[gstreamer] gstCamera -- found 10 caps for v4l2 device /dev/video2
[gstreamer] [0] video/x-raw, format=(string)YUY2, width=(int)1280, height=(int)720, pixel-aspect-ratio=(fraction)1/1, framerate=(fraction)10/1;
[gstreamer] [1] video/x-raw, format=(string)YUY2, width=(int)1280, height=(int)712, pixel-aspect-ratio=(fraction)1/1, framerate=(fraction)10/1;
[gstreamer] [2] video/x-raw, format=(string)YUY2, width=(int)1280, height=(int)480, pixel-aspect-ratio=(fraction)1/1, framerate=(fraction)10/1;
[gstreamer] [3] video/x-raw, format=(string)YUY2, width=(int)640, height=(int)480, pixel-aspect-ratio=(fraction)1/1, framerate=(fraction)30/1;
[gstreamer] [4] video/x-raw, format=(string)YUY2, width=(int)640, height=(int)472, pixel-aspect-ratio=(fraction)1/1, framerate=(fraction)30/1;
[gstreamer] [5] image/jpeg, width=(int)1280, height=(int)720, pixel-aspect-ratio=(fraction)1/1, framerate=(fraction)15/1;
[gstreamer] [6] image/jpeg, width=(int)1280, height=(int)712, pixel-aspect-ratio=(fraction)1/1, framerate=(fraction)15/1;
[gstreamer] [7] image/jpeg, width=(int)1280, height=(int)480, pixel-aspect-ratio=(fraction)1/1, framerate=(fraction)20/1;
[gstreamer] [8] image/jpeg, width=(int)640, height=(int)480, pixel-aspect-ratio=(fraction)1/1, framerate=(fraction)30/1;
[gstreamer] [9] image/jpeg, width=(int)640, height=(int)472, pixel-aspect-ratio=(fraction)1/1, framerate=(fraction)30/1;
[gstreamer] gstCamera -- selected device profile:  codec=raw format=yuyv width=640 height=472
[gstreamer] gstCamera pipeline string:
[gstreamer] v4l2src device=/dev/video2 do-timestamp=true ! video/x-raw, format=(string)YUY2, width=(int)640, height=(int)472 ! appsink name=mysink
[gstreamer] gstCamera successfully created device v4l2:///dev/video2
[video]  created gstCamera from v4l2:///dev/video2
------------------------------------------------
gstCamera video options:
------------------------------------------------
  -- URI: v4l2:///dev/video2
     - protocol:  v4l2
     - location:  /dev/video2
     - port:      2
  -- deviceType: v4l2
  -- ioType:     input
  -- codec:      raw
  -- width:      640
  -- height:     472
  -- frameRate:  30.000000
  -- bitRate:    0
  -- numBuffers: 4
  -- zeroCopy:   true
  -- flipMethod: none
  -- loop:       0
  -- rtspLatency 2000
------------------------------------------------
[gstreamer] gstCamera -- attempting to create device v4l2:///dev/video3
[gstreamer] gstCamera -- found v4l2 device: USB2.0-Camera
[gstreamer] v4l2-proplist, device.path=(string)/dev/video3, udev-probed=(boolean)false, device.api=(string)v4l2, v4l2.device.driver=(string)uvcvideo, v4l2.device.card=(string)USB2.0-Camera, v4l2.device.bus_info=(string)usb-70090000.xusb-2.2.4, v4l2.device.version=(uint)264701, v4l2.device.capabilities=(uint)2216689665, v4l2.device.device_caps=(uint)69206017;
[gstreamer] gstCamera -- found 8 caps for v4l2 device /dev/video3
[gstreamer] [0] video/x-raw, format=(string)YUY2, width=(int)1280, height=(int)720, pixel-aspect-ratio=(fraction)1/1, framerate=(fraction)5/1;
[gstreamer] [1] video/x-raw, format=(string)YUY2, width=(int)1280, height=(int)712, pixel-aspect-ratio=(fraction)1/1, framerate=(fraction)15/1;
[gstreamer] [2] video/x-raw, format=(string)YUY2, width=(int)640, height=(int)480, pixel-aspect-ratio=(fraction)1/1, framerate=(fraction)20/1;
[gstreamer] [3] video/x-raw, format=(string)YUY2, width=(int)640, height=(int)472, pixel-aspect-ratio=(fraction)1/1, framerate=(fraction)20/1;
[gstreamer] [4] image/jpeg, width=(int)1280, height=(int)720, pixel-aspect-ratio=(fraction)1/1, framerate=(fraction)15/1;
[gstreamer] [5] image/jpeg, width=(int)1280, height=(int)712, pixel-aspect-ratio=(fraction)1/1, framerate=(fraction)15/1;
[gstreamer] [6] image/jpeg, width=(int)640, height=(int)480, pixel-aspect-ratio=(fraction)1/1, framerate=(fraction)20/1;
[gstreamer] [7] image/jpeg, width=(int)640, height=(int)472, pixel-aspect-ratio=(fraction)1/1, framerate=(fraction)20/1;
[gstreamer] gstCamera -- selected device profile:  codec=raw format=yuyv width=640 height=472
[gstreamer] gstCamera pipeline string:
[gstreamer] v4l2src device=/dev/video3 do-timestamp=true ! video/x-raw, format=(string)YUY2, width=(int)640, height=(int)472 ! appsink name=mysink
[gstreamer] gstCamera successfully created device v4l2:///dev/video3
[video]  created gstCamera from v4l2:///dev/video3
------------------------------------------------
gstCamera video options:
------------------------------------------------
  -- URI: v4l2:///dev/video3
     - protocol:  v4l2
     - location:  /dev/video3
     - port:      3
  -- deviceType: v4l2
  -- ioType:     input
  -- codec:      raw
  -- width:      640
  -- height:     472
  -- frameRate:  20.000000
  -- bitRate:    0
  -- numBuffers: 4
  -- zeroCopy:   true
  -- flipMethod: none
  -- loop:       0
  -- rtspLatency 2000
------------------------------------------------
[OpenGL] glDisplay -- X screen 0 resolution:  1920x1080
[OpenGL] glDisplay -- X window resolution:    1920x1080
[OpenGL] glDisplay -- display device initialized (1920x1080)
[video]  created glDisplay from display://0
------------------------------------------------
glDisplay video options:
------------------------------------------------
  -- URI: display://0
     - protocol:  display
     - location:  0
  -- deviceType: display
  -- ioType:     output
  -- codec:      raw
  -- width:      1920
  -- height:     1080
  -- frameRate:  0.000000
  -- bitRate:    0
  -- numBuffers: 4
  -- zeroCopy:   true
  -- flipMethod: none
  -- loop:       0
  -- rtspLatency 2000
------------------------------------------------
[gstreamer] opening gstCamera for streaming, transitioning pipeline to GST_STATE_PLAYING
[gstreamer] gstreamer changed state from NULL to READY ==> mysink
[gstreamer] gstreamer changed state from NULL to READY ==> capsfilter1
[gstreamer] gstreamer changed state from NULL to READY ==> jpegdec0
[gstreamer] gstreamer changed state from NULL to READY ==> capsfilter0
[gstreamer] gstreamer changed state from NULL to READY ==> v4l2src0
[gstreamer] gstreamer changed state from NULL to READY ==> pipeline0
[gstreamer] gstreamer changed state from READY to PAUSED ==> capsfilter1
[gstreamer] gstreamer changed state from READY to PAUSED ==> jpegdec0
[gstreamer] gstreamer changed state from READY to PAUSED ==> capsfilter0
[gstreamer] gstreamer stream status CREATE ==> src
[gstreamer] gstreamer changed state from READY to PAUSED ==> v4l2src0
[gstreamer] gstreamer changed state from READY to PAUSED ==> pipeline0
[gstreamer] gstreamer stream status ENTER ==> src
[gstreamer] gstreamer message new-clock ==> pipeline0
[gstreamer] gstreamer changed state from PAUSED to PLAYING ==> capsfilter1
[gstreamer] gstreamer message stream-start ==> pipeline0
[gstreamer] gstreamer changed state from PAUSED to PLAYING ==> jpegdec0
[gstreamer] gstreamer changed state from PAUSED to PLAYING ==> capsfilter0
[gstreamer] gstreamer changed state from PAUSED to PLAYING ==> v4l2src0
[gstreamer] gstCamera -- onPreroll
[gstreamer] gstBufferManager -- map buffer size was less than max size (115200 vs 115207)
[gstreamer] gstBufferManager recieve caps:  video/x-raw, format=(string)I420, width=(int)320, height=(int)240, interlace-mode=(string)progressive, multiview-mode=(string)mono, multiview-flags=(GstVideoMultiviewFlagsSet)0:ffffffff:/right-view-first/left-flipped/left-flopped/right-flipped/right-flopped/half-aspect/mixed-mono, pixel-aspect-ratio=(fraction)1/1, chroma-site=(string)jpeg, colorimetry=(string)1:4:0:0, framerate=(fraction)30/1
[gstreamer] gstBufferManager -- recieved first frame, codec=mjpeg format=i420 width=320 height=240 size=115207
RingBuffer -- allocated 4 buffers (115207 bytes each, 460828 bytes total)
[gstreamer] gstreamer changed state from READY to PAUSED ==> mysink
[gstreamer] gstreamer message async-done ==> pipeline0
[gstreamer] gstreamer changed state from PAUSED to PLAYING ==> mysink
[gstreamer] gstreamer changed state from PAUSED to PLAYING ==> pipeline0
RingBuffer -- allocated 4 buffers (230400 bytes each, 921600 bytes total)
[OpenGL] glDisplay -- set the window size to 320x240
[OpenGL] creating 320x240 texture (GL_RGB8 format, 230400 bytes)
[cuda]   registered openGL texture for interop access (320x240, GL_RGB8, 230400 bytes)
[gstreamer] opening gstCamera for streaming, transitioning pipeline to GST_STATE_PLAYING
[gstreamer] gstreamer changed state from NULL to READY ==> mysink
[gstreamer] gstreamer changed state from NULL to READY ==> capsfilter2
[gstreamer] gstreamer changed state from NULL to READY ==> v4l2src1
[gstreamer] gstreamer changed state from NULL to READY ==> pipeline1
[gstreamer] gstreamer changed state from READY to PAUSED ==> capsfilter2
[gstreamer] gstreamer stream status CREATE ==> src
[gstreamer] gstreamer changed state from READY to PAUSED ==> v4l2src1
[gstreamer] gstreamer changed state from READY to PAUSED ==> pipeline1
[gstreamer] gstreamer message new-clock ==> pipeline1
[gstreamer] gstreamer changed state from PAUSED to PLAYING ==> capsfilter2
[gstreamer] gstreamer changed state from PAUSED to PLAYING ==> v4l2src1
[gstreamer] gstreamer stream status ENTER ==> src
[gstreamer] gstreamer message stream-start ==> pipeline1
[gstreamer] gstCamera -- onPreroll
[gstreamer] gstBufferManager recieve caps:  video/x-raw, format=(string)YUY2, width=(int)640, height=(int)472, pixel-aspect-ratio=(fraction)1/1, framerate=(fraction)20/1, colorimetry=(string)2:4:5:1, interlace-mode=(string)progressive
[gstreamer] gstBufferManager -- recieved first frame, codec=raw format=yuyv width=640 height=472 size=604160
RingBuffer -- allocated 4 buffers (604160 bytes each, 2416640 bytes total)
[gstreamer] gstreamer changed state from READY to PAUSED ==> mysink
[gstreamer] gstreamer message async-done ==> pipeline1
[gstreamer] gstreamer changed state from PAUSED to PLAYING ==> mysink
[gstreamer] gstreamer changed state from PAUSED to PLAYING ==> pipeline1
RingBuffer -- allocated 4 buffers (906240 bytes each, 3624960 bytes total)
[OpenGL] glDisplay -- set the window size to 640x472
[OpenGL] creating 640x472 texture (GL_RGB8 format, 906240 bytes)
[cuda]   registered openGL texture for interop access (640x472, GL_RGB8, 906240 bytes)
[gstreamer] opening gstCamera for streaming, transitioning pipeline to GST_STATE_PLAYING
[gstreamer] gstreamer changed state from NULL to READY ==> mysink
[gstreamer] gstreamer changed state from NULL to READY ==> capsfilter3
[gstreamer] gstreamer changed state from NULL to READY ==> v4l2src2
[gstreamer] gstreamer changed state from NULL to READY ==> pipeline2
[gstreamer] gstreamer changed state from READY to PAUSED ==> capsfilter3
[gstreamer] gstreamer stream status CREATE ==> src
[gstreamer] gstreamer changed state from READY to PAUSED ==> v4l2src2
[gstreamer] gstreamer changed state from READY to PAUSED ==> pipeline2
[gstreamer] gstreamer message new-clock ==> pipeline2
[gstreamer] gstreamer stream status ENTER ==> src
[gstreamer] gstreamer changed state from PAUSED to PLAYING ==> capsfilter3
[gstreamer] gstreamer changed state from PAUSED to PLAYING ==> v4l2src2
[gstreamer] gstreamer message stream-start ==> pipeline2
[gstreamer] gstCamera -- end of stream (EOS)
[gstreamer] gstreamer v4l2src2 ERROR Failed to allocate required memory.
[gstreamer] gstreamer Debugging info: gstv4l2src.c(658): gst_v4l2src_decide_allocation (): /GstPipeline:pipeline2/GstV4l2Src:v4l2src2:
Buffer pool activation failed
[gstreamer] gstreamer v4l2src2 ERROR Internal data stream error.
[gstreamer] gstreamer Debugging info: gstbasesrc.c(3055): gst_base_src_loop (): /GstPipeline:pipeline2/GstV4l2Src:v4l2src2:
streaming stopped, reason not-negotiated (-4)
[gstreamer] gstreamer changed state from READY to PAUSED ==> mysink

AK51 · July 27, 2022, 2:53am

Hi,

I checked my nano memory in system and it does not hit max. (Did not really use swap memory niether)
I guess it is the problem with gstreamer memory maximum setting?
(320x240) x 4 cam < (1920 x 1080)
Do I need to re-build the gstreamer? Or it is the problem with the nano?
If yes, how may I re-built it. Thx
BTW, I did try 4 cam on my AGX, it does not work neither, it is not the nano memory size issue I think.

Thx

AK51 · July 27, 2022, 3:00am

Hi,

I did use try and except, it does not help neither.
it seems --input-width=320 --input-height=240 only works after the stream is accepted.
When I look at this error
[gstreamer] gstreamer v4l2src2 ERROR Failed to allocate required memory
it seems like the usb cam still sending max resolution stream? How can I force the usb cam to send 320x240 resolution in system level? Thanks,

AK51 · July 27, 2022, 3:05am

Hi,

PlanB is to use 4 usb cam at 320x240
I use round robbin and I can see 4 cameras, the fps is slow… is there any way to improve the fps? Thx

import jetson.inference
import jetson.utils
import sys
net = jetson.inference.detectNet("ssd-mobilenet-v2", threshold=0.5)
argv="--input-width=320 --input-height=240"
camera = jetson.utils.videoSource("/dev/video0", argv=sys.argv)
display = jetson.utils.videoOutput("display://0") # 'my_video.mp4' for file
i = 0

while display.IsStreaming():
	try:
		if(i==0):
			camera = jetson.utils.videoSource("/dev/video0", argv=sys.argv)
		elif(i==1):
			camera = jetson.utils.videoSource("/dev/video1", argv=sys.argv)
		elif(i==2):
			camera = jetson.utils.videoSource("/dev/video2", argv=sys.argv)
		elif(i==3):
			camera = jetson.utils.videoSource("/dev/video3", argv=sys.argv)
		if(i>=3):
			i = 0
		else:
			i=i+1
		img = camera.Capture()
		detections = net.Detect(img)
		display.Render(img)
		display.SetStatus("Object Detection | Network {:.0f} FPS".format(net.GetNetworkFPS()))
	except:
		print("skip frame")

DaneLLL · July 27, 2022, 3:13am

Hi,
You may try like this:
Two 1080p USB cameras on Nano - #17 by DaneLLL

The device may request for fixed bandwidth even through the resolution is 320x240. See if you can customize the UVC driver and limit the bandwidth for each camera.

AK51 · July 27, 2022, 3:53am

Hi,
It seems hard to modify and rebuild the driver… Not sure how to do it correctly…
Anyway, I use this code and got 1fps. It is ok for now.
Since the nano can accept 2 usb stream. is it possible to do the pipeline that use the stream alternatively?
If there is any way I can increase the fps, pls let me know.

Thx

python3 cam4.py --input-width=1280 --input-height=720 --input-codec=mjpeg

import jetson.inference
import jetson.utils
import sys
import time
net = jetson.inference.detectNet("ssd-mobilenet-v2", threshold=0.5)
argv="--input-width=320 --input-height=240"
camera = jetson.utils.videoSource("/dev/video0", argv=sys.argv)
display = jetson.utils.videoOutput("display://0") # 'my_video.mp4' for file
i = 0
now_time = time.time()
prev_time = time.time()

while display.IsStreaming():
	now_time = time.time()
	print("fps: ", 1/(now_time - prev_time))
	prev_time = now_time
	print("###################### i = ", i)
	try:
		if(i==0):
			camera = jetson.utils.videoSource("/dev/video0", argv=sys.argv)
		elif(i==1):
			camera = jetson.utils.videoSource("/dev/video1", argv=sys.argv)
		elif(i==2):
			camera = jetson.utils.videoSource("/dev/video2", argv=sys.argv)
		elif(i==3):
			camera = jetson.utils.videoSource("/dev/video3", argv=sys.argv)
		img = camera.Capture()
		if(i>=3):
			i = 0
		else:
			i=i+1

		detections = net.Detect(img)
		display.Render(img)
	except:
		print("skip frame")

system · August 24, 2022, 12:35am

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