ModalAI Forum

@tom
I've tried docker run -v /sdcard:/sdcard, but not working. It's not showing sdcard directory.

As I'm working on this issue, I noticed the following.

yocto:/# ifconfig
lo Link encap:Local Loopback
inet addr:127.0.0.1 Mask:255.0.0.0
inet6 addr: ::1/128 Scope:Host
UP LOOPBACK RUNNING MTU:65536 Metric:1
RX packets:32 errors:0 dropped:0 overruns:0 frame:0
TX packets:32 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:2224 (2.1 KiB) TX bytes:2224 (2.1 KiB)

wlan0 Link encap:Ethernet HWaddr :::::
inet addr:192.168..** Bcast:192.168..*** Mask:...
inet6 addr: :::::**/** Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:467 errors:0 dropped:0 overruns:0 frame:0
TX packets:88 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:3000
RX bytes:40293 (39.3 KiB) TX bytes:10317 (10.0 KiB)

https://stackoverflow.com/questions/64028448/error-during-connect-get-http-2fvar2frun2fdocker-sock-v1-40-containers-jso

It's not showing any IP address for docker0.
How to configure the IP address that will listen to docker daemon on voxl-core board?

yocto:/# systemctl status docker
● docker.service - Docker Application Container Engine
Loaded: loaded (/lib/systemd/system/docker.service; disabled; vendor preset: enabled)
Active: failed (Result: exit-code) since Mon 2021-01-11 06:31:53 UTC; 1min 53s ago
Docs: http://docs.docker.com
Main PID: 4675 (code=exited, status=2)

Jan 11 06:31:53 apq8096 systemd[1]: Started Docker Application Container Engine.
Jan 11 06:31:53 apq8096 docker[4675]: flag provided but not defined: --raw-logs
Jan 11 06:31:53 apq8096 docker[4675]: See '/usr/bin/docker daemon --help'.
Jan 11 06:31:53 apq8096 systemd[1]: docker.service: Main process exited, co...NT
Jan 11 06:31:53 apq8096 systemd[1]: docker.service: Unit entered failed state.
Jan 11 06:31:53 apq8096 systemd[1]: docker.service: Failed with result 'exi...'.
Jan 11 06:31:57 apq8096 systemd[1]: Stopped Docker Application Container Engine.
Jan 11 06:33:06 apq8096 systemd[1]: Stopped Docker Application Container Engine.
Hint: Some lines were ellipsized, use -l to show in full.

yocto:/# voxl-configure-docker-support.sh
Stopping original docker service
Enabling our own services docker-start & docker-prepare
starting docker-start.service
loading hello-world docker image
Cannot connect to the Docker daemon. Is the docker daemon running on this host?
yocto:/#

RE: https://forum.modalai.com/topic/37/docker-daemon-fails-to-start-voxl
I'm also facing the same issue.

yocto:/# voxl-docker -i roskinetic-xenial:opencv
Cannot connect to the Docker daemon. Is the docker daemon running on this host?
yocto:/#
yocto:/#
yocto:/# docker images
Cannot connect to the Docker daemon. Is the docker daemon running on this host?
yocto:/#
yocto:/#
yocto:/# df -h
Filesystem Size Used Avail Use% Mounted on
/dev/root 2.8G 2.2G 581M 79% /
devtmpfs 1.8G 0 1.8G 0% /dev
tmpfs 1.9G 0 1.9G 0% /dev/shm
tmpfs 1.9G 17M 1.9G 1% /run
tmpfs 1.9G 0 1.9G 0% /sys/fs/cgroup
tmpfs 1.9G 4.0K 1.9G 1% /var/volatile
/dev/mmcblk0p1 7.4G 204M 7.2G 3% /mnt/sdcard
/dev/sda2 2.2M 80K 2.0M 4% /persist
/dev/sde12 12M 4.1M 7.4M 36% /dsp
/dev/sde11 95M 33M 63M 35% /firmware
/dev/sda3 58M 40K 57M 1% /cache
/dev/sda9 15G 13G 2.4G 85% /data
yocto:/#

As you can see, /data partition has all the data and docker images.

What can be a solution for this?

@Chad-Sweet
I'm using the Ubuntu Docker container on VOXL.
OpenCV4 in Python3 is working.

But I'm facing issues while mounting sdcard on it.
I'm referring to this link.

I'm using the below command to mount sdcard.
docker run -v /mnt/sdcard:/root/yoctohome/:rw -w /root/ roskinetic-xenial:opencv

How can I mount a sdcard on the Ubuntu Docker container on VOXL?

How can I use OpenCV4.x with Python3.6.9 using Ubuntu Docker container on VOXL?

@Chad-Sweet
If I'll use an Ubuntu Docker container on VOXL, can you provide documentation or steps using which I can build OpenCV4.x on Python 3.6.9?

Or a pre-build file of OpenCV4.x for Python3.6.9?

Thanks!

Yes, I have to run my program using Python3.6.9 and OpenCV 4.X.
And it wouldn't allow running a program on Docker container on VOXL.

I've installed Python3 on the voxl core-board. I've also installed OpenCV-3.4.6 using https://gitlab.com/voxl-public/other/voxl-opencv-3-4-6
But I'm unable to access OpenCV in Python3.
I'm getting an error like this.

/ # python3
Python 3.6.9 (default, Dec 19 2020, 12:09:26)
[GCC 4.9.3] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>>import cv2
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
ModuleNotFoundError: No module named 'cv2'

How to import OpenCV in Python3?

Any suggestions would be greatly appreciated!
Thanks!

@Eric-Katzfey
Yes! There is no direct interface with the hires camera in OpenCV.
I'll follow the steps as you suggested.

Thanks!

Hi @modaltb
The above example is in development and it's not that useful. As I'm looking for on-board processing.
Is there any option to access the video feed of Hires camera directly using OpenCV for on-board processing?
(on-board operations like Object Tracking)

Hi,
I'm working on OpenCV using the voxl core-board. I've connected hires + tracking camera.

I want to save the frames of hires camera using cv2.VideoCapture(0) method but it prompts an error.
I'm unable to open the video stream using cv2.VideoCapture(0).

I also want to know the scope of OpenCV using the voxl core-board. (Any limitations?)

Any suggestions would be greatly appreciated!

Thanks!

@tom
Yes, it's working.

Thanks!

Hi @tom

Using voxl core-board, when we run "docker run -i -t --rm -v /dev/bus/usb/:/dev/bus/usb --net=host --privileged libgphoto2" command, we get
root@apq8096:/#

In this, we are unable to get an SD card.

root@apq8096:/# ls
FFmpeg etc media root sys voxl-libgphoto2
bin gphoto2-updater.sh mnt run tmp voxl-libgphoto2.py
boot home opt sbin usr
dev lib proc srv var

root@apq8096:/# cd mnt/
root@apq8096:/mnt# ls
root@apq8096:/mnt#

In adb shell,
/ # ls
WEBSERVER data flight_controller lost+found proc srv usr
bin dev home media run sys var
boot dsp lib mnt sbin system vendor
build.prop etc lib64 opt sdcard target
cache firmware linuxrc persist share tmp

we can get an SD card in the /mnt directory.
/ # cd mnt/
/mnt # ls
sdcard

So if we are in "root@apq8096:/#" then how to access the /sdcard/ directory?
And how to write an image into sdcard?

I've tried like this,
gphoto2 --capture-image-and-download --folder=/mnt/sdcard/
It's not saving the images into an SD card.

Thanks!

Hi @modaltb

I've tried it using --filename FILENAME option, but it's saving images only in a specified pattern. It's not ignoring the overwrite option.
The image name should be different from the previous images in my case.

Thanks!

@modaltb
No.
I'll try this and let you know.
And how can I save the images on SD card?

Thanks!

Hi,
I'm using gphoto library to save the camera images into the voxl core-board by following https://docs.modalai.com/voxl-libgphoto2/

I am looking for a way to save the images into the SD card instead of saving them into the internal memory of the voxl core-board.

As well as I am looking for a way to have filenames numbered as they're saved instead of asking to overwrite the previous photos (like capt001.arw, capt002.arw, and so on).
Command: gphoto2 --capture-image-and-download

Thank you.