USB camera management on Linux

So you have a USB Camera plugged in to your Ubuntu box.  You then notice that your camera’s led is on (could also be true for an integrated web camera on a lap top).  This could  be because you left a camera app running and forgot to turn it off (exit). The app Cheese for example or worse yet you closed all camera apps but you have been hacked.  I won’t go into how to clean your PC here but if you want to disable your USB/integrated camera here are two very useful lines”

  1. exit cheese or your camera app
  2. sudo modprobe -r uvcvideo <– to disable the camera
  3. restart cheese no LED or camera image
  4. exit cheese
  5. sudo modprobe uvcvideo <—- to enable the camera
  6. restart cheese LED and image

Now this will not be preserved across reboot so the following might prove equally useful:

sudo vi /etc/modprobe.d/blacklist.conf
add the following two lines at the end of the file
#Disable webcam
blacklist uvcvideo
toggle “cheese” to see if you can view webcam contents or reboot

remove those two lines to restore webcam usage.

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Defining an external root usb drive on a Pi 4 using ubuntu 19

This took me quite a while to get it working.  Everything I read and that which was suggested did not work.  Then I found one write up that gave me hope and now i will pass that on to you.  See this link to see how.

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Webserver rebuild after failed uprade

I updated my webserver with Ubuntu 18.  Then I decided to upgrade to Ubuntu 19.  But first I needed a backup of WordPress.  I decided on “UpdraftPlus“.  I backed up my WordPress data and moved it to a thumb drive.  Then for the move to Ubuntu 19.  It failed.  After about 1.5 hours the process just hung.  I did a hard reset and that was it.  I should also point out that I had no power to the PC internals – MB, disks so I am assuming that shortly after I started the upgrade the Power supply failed.  Can’t complain:  10 years x 24 hours a day.  Took me 4 days to rebuild the box.  I had good Readme.files but many of the commands in them were no longer valid because mysql, apache2 had changed their syntax for their commands/statements.  Lots of Googling.  Anyway once I got the box configured  to support WordPress and got WP downloaded and installed I once again downloaded the UpdraftPlus plugin for backups/restore.  I moved the backup files from the thumb drive to “wp-content/updraft” on the newly build PC and using UpdraftPlus restored the data.  PERFECT!!!  About 2 minutes and my WordPress blog was recovered vs. 4 days of rebuilding a PC.  UpdraftPlus is definitely a winner.

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Ubuntu Server install on a Pi 4 – easier then you might think

Like many of us waiting for a version of Ubuntu Mate for the Pi 4  I kept looking to see if it was released yet.  No.  Nothing.  However in my search I came across a website that offered promised but when I burned their iso image to the sdc card it failed to boot.  The I came across a Youtube video that got me passed the “failed to boot” issue so that I could login.  There would still be hurdles to come but I present the procedure here in what I hope will be an almost cut and paste procedure.

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PTZ not working in Blue Iris 5 with Yoosee camera

I recently received a new PTZ  camera (works with the Yoosee video application)  I ordered the camera from AliExpress. I got the video side working fairly easily with the Blue Iris camera app, but had some real difficulty getting the camera to pan/tilt/zoom. In an associated page I will show you what I did. It is quite easy actually.  You can read the details  here .

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Installing a V380 IP camera.

Configuring and installing a V380 network camera. The hardest thing I have ever done!!!

The details are here.


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Back Online

After a gateway swap out that AT&T promised would be simple the website is finally back online.  Much of the problem was me finding the time.  But here we are!!!  Tah Dah!!!       

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Where is “VLC” in the OBS Source list?

Continue reading

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Livestream a camera to Youtube

Got an IP camera to livestream to Youtube using Blue Iris as the video streaming application.  There were a few bumps, for example why does my stream run  for several hours/days then suddenly quit?  The answer to that question is here

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bought a new “cruncher”: AMD RYZEN 1700 and AMD RADEON RX 580

Yesterday I bought a new “cruncher”:  a Dell AMD Ryzen 7 1700 with an AMD Radeon RX 580.  As soon as I got home I removed Windows 10 and installed Ubuntu 16 (tried 17 on this node but had issues).  This PC required the installation of new AMD GPU PRO driver support because Einstein@Home did not recognize the onboard GPU.  There were errors in the AMD procedure which I will address later in a more detailed page on this website.  Now for the “bad news”  Once the drivers were successfully installed Einstein@Home is reporting the GPU as being a 480 and not a 580.  I will have to look into this and depending on what I find contact the store to see what is going on.

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