Multiple usb cameras video recording using opencv 4.1.1 on jetpack4.3

Autonomous Machines Jetson & Embedded Systems Jetson TX2
1

Hello,
I’ve recently upgraded TX2 to jetpack 4.3 from 4.2 and it came with installed opencv 4.1.1 version.
For my project, I’m using about 4-5 usb cameras with TX2.

I’m using python 3.6.9 with opencv 4.1.1

When I was on jetpack 4.2 I was able to get 5 cameras streaming locally with python code using opencv 3.

Now with current version, I’m able to get only 2 camera streaming at a time and that too only at max resolution of 480p i.e. cap.set(3, 1280) and cap.set(4, 720) is also not working.

I’ve tried recording videos with 3 cameras without showing the feed on screen but only 2 cameras did record the video and third file was empty.

I tried using gstreamer but that is so much complicated so i want to use opencv for video recording.

Need help regarding this.

Here’s the code I’m running.

#6 cameras streaming code

import cv2

video_capture_0 = cv2.VideoCapture(1) 
video_capture_1 = cv2.VideoCapture(2) 
video_capture_2 = cv2.VideoCapture(3) 
video_capture_3 = cv2.VideoCapture(4) 
video_capture_4 = cv2.VideoCapture(5) 
video_capture_5 = cv2.VideoCapture(6) 

#video_capture_0.set(3, 1280)
#video_capture_0.set(4, 720)

while True:
    ret0, frame0 = video_capture_0.read()
    ret1, frame1 = video_capture_1.read()
    ret2, frame2 = video_capture_2.read()
    ret3, frame3 = video_capture_3.read()
    ret4, frame4 = video_capture_4.read()
    ret5, frame5 = video_capture_5.read()

    if (ret0):

        cv2.imshow('cam 0', frame0)

    if (ret1):
 
        cv2.imshow('Cam 1', frame1)

    if (ret2):
 
        cv2.imshow('cam 2', frame2)

    if (ret3):

        cv2.imshow('Cam 3', frame3)

    if (ret4):
 
        cv2.imshow('Cam 4', frame4)

    if (ret5):
 
        cv2.imshow('Cam 5', frame5)


    if cv2.waitKey(1) & 0xFF == ord('q'):
        break

video_capture_0.release()
video_capture_1.release()
video_capture_2.release()
video_capture_3.release()
video_capture_4.release()
video_capture_5.release()
cv2.destroyAllWindows()
2

Hi,
It probably is an issue in OpenCV4.1.1. Please rollback to 3.4.0 and give it a try

1 Purge 4.1.1

sudo sudo apt-get purge *libopencv*

2 Run the script
https://github.com/AastaNV/JEP/blob/276306e052aba5ff131d6e785960abbb187bacde/script/install_opencv3.4.0_TX2.sh

3

I’ve tried the above command but it doesn’t remove the 4.1.1 version

4

Hi,
We can see it be removed:

nvidia@nvidia-desktop:~$ python
Python 2.7.17 (default, Nov  7 2019, 10:07:09)
[GCC 7.4.0] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> import cv2
>>> cv2.__version__
'4.1.1'
>>>
nvidia@nvidia-desktop:~$ sudo sudo apt-get purge *libopencv*
[sudo] password for nvidia:
Reading package lists... Done
Building dependency tree
Reading state information... Done
Note, selecting 'libopencv3.2-java' for glob '*libopencv*'
Note, selecting 'libopencv-photo3.2' for glob '*libopencv*'
Note, selecting 'libopencv-core-dev' for glob '*libopencv*'
Note, selecting 'libopencv-photo4.0' for glob '*libopencv*'
Note, selecting 'libopencv-gpu-dev' for glob '*libopencv*'
Note, selecting 'libopencv-apps0d' for glob '*libopencv*'
Note, selecting 'libopencv' for glob '*libopencv*'
Note, selecting 'libopencv-video3.2' for glob '*libopencv*'
Note, selecting 'libopencv-calib3d-dev' for glob '*libopencv*'
Note, selecting 'libopencv-ml-dev' for glob '*libopencv*'
Note, selecting 'libopencv-video4.0' for glob '*libopencv*'
Note, selecting 'libopencv-imgcodecs3.2' for glob '*libopencv*'
Note, selecting 'libopencv-shape-dev' for glob '*libopencv*'
Note, selecting 'libopencv-imgcodecs4.0' for glob '*libopencv*'
Note, selecting 'libopencv-imgcodecs-dev' for glob '*libopencv*'
Note, selecting 'libopencv-apps-dev' for glob '*libopencv*'
Note, selecting 'libopencv-highgui3.2' for glob '*libopencv*'
Note, selecting 'libopencv-calib3d3.2' for glob '*libopencv*'
Note, selecting 'libopencv-highgui4.0' for glob '*libopencv*'
Note, selecting 'libopencv-ml3.2' for glob '*libopencv*'
Note, selecting 'libopencv-imgproc3.2' for glob '*libopencv*'
Note, selecting 'libopencv-videoio-dev' for glob '*libopencv*'
Note, selecting 'libopencv-shape3.2' for glob '*libopencv*'
Note, selecting 'libopencv-calib3d4.0' for glob '*libopencv*'
Note, selecting 'libopencv-ml4.0' for glob '*libopencv*'
Note, selecting 'libopencv-imgproc4.0' for glob '*libopencv*'
Note, selecting 'libopencv-objdetect3.2' for glob '*libopencv*'
Note, selecting 'libopencv-objdetect4.0' for glob '*libopencv*'
Note, selecting 'libopencv-samples' for glob '*libopencv*'
Note, selecting 'libopencv-stitching-dev' for glob '*libopencv*'
Note, selecting 'libopencv2.4-java' for glob '*libopencv*'
Note, selecting 'libopencv-features2d-dev' for glob '*libopencv*'
Note, selecting 'libopencv-superres-dev' for glob '*libopencv*'
Note, selecting 'libopencv-features2d3.2' for glob '*libopencv*'
Note, selecting 'libopencv-features2d4.0' for glob '*libopencv*'
Note, selecting 'libopencv-stitching3.2' for glob '*libopencv*'
Note, selecting 'libopencv-flann-dev' for glob '*libopencv*'
Note, selecting 'libopencv-viz3.2' for glob '*libopencv*'
Note, selecting 'libopencv-stitching4.0' for glob '*libopencv*'
Note, selecting 'libopencv-viz-dev' for glob '*libopencv*'
Note, selecting 'libopencv-flann3.2' for glob '*libopencv*'
Note, selecting 'libopencv3.2-jni' for glob '*libopencv*'
Note, selecting 'libopencv-imgproc-dev' for glob '*libopencv*'
Note, selecting 'libopencv-contrib-dev' for glob '*libopencv*'
Note, selecting 'libopencv-flann4.0' for glob '*libopencv*'
Note, selecting 'libopencv-ts4.0' for glob '*libopencv*'
Note, selecting 'libopencv-videostab3.2' for glob '*libopencv*'
Note, selecting 'libopencv-python' for glob '*libopencv*'
Note, selecting 'libopencv-contrib3.2' for glob '*libopencv*'
Note, selecting 'libopencv-photo-dev' for glob '*libopencv*'
Note, selecting 'libopencv-superres3.2' for glob '*libopencv*'
Note, selecting 'libopencv-objdetect-dev' for glob '*libopencv*'
Note, selecting 'libopencv-core3.2' for glob '*libopencv*'
Note, selecting 'libopencv-videostab-dev' for glob '*libopencv*'
Note, selecting 'libopencv-dev' for glob '*libopencv*'
Note, selecting 'libopencv-doc' for glob '*libopencv*'
Note, selecting 'libopencv-core4.0' for glob '*libopencv*'
Note, selecting 'libopencv-ts-dev' for glob '*libopencv*'
Note, selecting 'libopencv-video-dev' for glob '*libopencv*'
Note, selecting 'libopencv-videoio3.2' for glob '*libopencv*'
Note, selecting 'libopencv-highgui-dev' for glob '*libopencv*'
Note, selecting 'libopencv-videoio4.0' for glob '*libopencv*'
Package 'libopencv-gpu-dev' is not installed, so not removed
Package 'libopencv2.4-java' is not installed, so not removed
Package 'libopencv-doc' is not installed, so not removed
Note, selecting 'libopencv' instead of 'libopencv-calib3d4.0'
Note, selecting 'libopencv' instead of 'libopencv-core4.0'
Note, selecting 'libopencv' instead of 'libopencv-features2d4.0'
Note, selecting 'libopencv' instead of 'libopencv-flann4.0'
Note, selecting 'libopencv' instead of 'libopencv-highgui4.0'
Note, selecting 'libopencv' instead of 'libopencv-imgcodecs4.0'
Note, selecting 'libopencv' instead of 'libopencv-imgproc4.0'
Note, selecting 'libopencv' instead of 'libopencv-ml4.0'
Note, selecting 'libopencv' instead of 'libopencv-objdetect4.0'
Note, selecting 'libopencv' instead of 'libopencv-photo4.0'
Note, selecting 'libopencv' instead of 'libopencv-stitching4.0'
Note, selecting 'libopencv' instead of 'libopencv-ts4.0'
Note, selecting 'libopencv' instead of 'libopencv-video4.0'
Note, selecting 'libopencv' instead of 'libopencv-videoio4.0'
Package 'libopencv-apps-dev' is not installed, so not removed
Package 'libopencv-apps0d' is not installed, so not removed
Package 'libopencv-calib3d-dev' is not installed, so not removed
Package 'libopencv-calib3d3.2' is not installed, so not removed
Package 'libopencv-contrib-dev' is not installed, so not removed
Package 'libopencv-contrib3.2' is not installed, so not removed
Package 'libopencv-core-dev' is not installed, so not removed
Package 'libopencv-core3.2' is not installed, so not removed
Package 'libopencv-features2d-dev' is not installed, so not removed
Package 'libopencv-features2d3.2' is not installed, so not removed
Package 'libopencv-flann-dev' is not installed, so not removed
Package 'libopencv-flann3.2' is not installed, so not removed
Package 'libopencv-highgui-dev' is not installed, so not removed
Package 'libopencv-highgui3.2' is not installed, so not removed
Package 'libopencv-imgcodecs-dev' is not installed, so not removed
Package 'libopencv-imgcodecs3.2' is not installed, so not removed
Package 'libopencv-imgproc-dev' is not installed, so not removed
Package 'libopencv-imgproc3.2' is not installed, so not removed
Package 'libopencv-ml-dev' is not installed, so not removed
Package 'libopencv-ml3.2' is not installed, so not removed
Package 'libopencv-objdetect-dev' is not installed, so not removed
Package 'libopencv-objdetect3.2' is not installed, so not removed
Package 'libopencv-photo-dev' is not installed, so not removed
Package 'libopencv-photo3.2' is not installed, so not removed
Package 'libopencv-shape-dev' is not installed, so not removed
Package 'libopencv-shape3.2' is not installed, so not removed
Package 'libopencv-stitching-dev' is not installed, so not removed
Package 'libopencv-stitching3.2' is not installed, so not removed
Package 'libopencv-superres-dev' is not installed, so not removed
Package 'libopencv-superres3.2' is not installed, so not removed
Package 'libopencv-ts-dev' is not installed, so not removed
Package 'libopencv-video-dev' is not installed, so not removed
Package 'libopencv-video3.2' is not installed, so not removed
Package 'libopencv-videoio-dev' is not installed, so not removed
Package 'libopencv-videoio3.2' is not installed, so not removed
Package 'libopencv-videostab-dev' is not installed, so not removed
Package 'libopencv-videostab3.2' is not installed, so not removed
Package 'libopencv-viz-dev' is not installed, so not removed
Package 'libopencv-viz3.2' is not installed, so not removed
Package 'libopencv3.2-java' is not installed, so not removed
Package 'libopencv3.2-jni' is not installed, so not removed
The following packages were automatically installed and are no longer required:
  apt-clone archdetect-deb bogl-bterm busybox-static cryptsetup-bin
  dpkg-repack gir1.2-timezonemap-1.0 gir1.2-xkl-1.0 grub-common
  kde-window-manager kinit kio kpackagetool5 kwayland-data kwin-common
  kwin-data kwin-x11 libdebian-installer4 libkdecorations2-5v5
  libkdecorations2private5v5 libkf5activities5 libkf5attica5
  libkf5completion-data libkf5completion5 libkf5declarative-data
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  libkf5globalaccelprivate5 libkf5idletime5 libkf5jobwidgets-data
  libkf5jobwidgets5 libkf5kcmutils-data libkf5kcmutils5 libkf5kiocore5
  libkf5kiontlm5 libkf5kiowidgets5 libkf5newstuff-data libkf5newstuff5
  libkf5newstuffcore5 libkf5package-data libkf5package5 libkf5plasma5
  libkf5quickaddons5 libkf5solid5 libkf5solid5-data libkf5sonnet5-data
  libkf5sonnetcore5 libkf5sonnetui5 libkf5textwidgets-data libkf5textwidgets5
  libkf5waylandclient5 libkf5waylandserver5 libkf5xmlgui-bin libkf5xmlgui-data
  libkf5xmlgui5 libkscreenlocker5 libkwin4-effect-builtins1 libkwineffects11
  libkwinglutils11 libkwinxrenderutils11 libqgsttools-p1 libqt5designer5
  libqt5help5 libqt5multimedia5 libqt5multimedia5-plugins
  libqt5multimediaquick-p5 libqt5multimediawidgets5 libqt5opengl5
  libqt5positioning5 libqt5printsupport5 libqt5qml5 libqt5quick5
  libqt5quickwidgets5 libqt5sensors5 libqt5sql5 libqt5test5 libqt5webchannel5
  libqt5webkit5 libxcb-composite0 libxcb-cursor0 libxcb-damage0 os-prober
  python3-dbus.mainloop.pyqt5 python3-icu python3-pam python3-pyqt5
  python3-pyqt5.qtsvg python3-pyqt5.qtwebkit python3-sip
  qml-module-org-kde-kquickcontrolsaddons qml-module-qtmultimedia
  qml-module-qtquick2 rdate tasksel tasksel-data
Use 'sudo apt autoremove' to remove them.
The following packages will be REMOVED:
  libopencv* libopencv-dev* libopencv-python* libopencv-samples*
  opencv-licenses* vpi-samples*
0 upgraded, 0 newly installed, 6 to remove and 279 not upgraded.
After this operation, 75.3 MB disk space will be freed.
Do you want to continue? [Y/n]
(Reading database ... 138852 files and directories currently installed.)
Removing vpi-samples (0.1.0) ...
Removing libopencv-dev (4.1.1-2-gd5a58aa75) ...
Removing opencv-licenses (4.1.1-2-gd5a58aa75) ...
Removing libopencv-python (4.1.1-2-gd5a58aa75) ...
Removing libopencv-samples (4.1.1-2-gd5a58aa75) ...
Removing libopencv (4.1.1-2-gd5a58aa75) ...
nvidia@nvidia-desktop:~$ python
Python 2.7.17 (default, Nov  7 2019, 10:07:09)
[GCC 7.4.0] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> import cv2
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
ImportError: No module named cv2
>>>
5

I did directly remove the directory of cv2 from its source i.e.

sudo rm -r /usr/local/lib/python3.6/dist-packages/cv2

and it did work.
Now installing opencv 3.4.0

Thanks