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• Use <video> HTML element - w3schools
• Disabling picture-in-picture

<video controls disablePictureInPicture controlsList="nodownload">
  <source src="https://www.w3schools.com/html/mov_bbb.ogg" type="video/mp4">
  <source src="https://www.w3schools.com/html/mov_bbb.mp4" type="video/ogg">
</video>

• Disabling picture-in-picture with JavaScript

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FFMPEG Cheat sheet

Compress MP4 files

ffmpeg -i input.mp4 -vcodec libx265 -crf 28 output.mp4

Compressed file to better compatibility (WhatsApp)

ffmpeg -i broken.mp4 -c:v libx264 -profile:v baseline -level 3.0 -pix_fmt yuv420p working.mp4

Convert MOV to MP4

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Expanding Root Volume on EC2 (Ubuntu)

df -hT
lsblk
sudo growpart /dev/nvme0n1 1

• For ext4

sudo resize2fs /dev/nvme0n1p1

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Installing Moodle on AWS LightSail

Start with a new LightSail Instance running Ubuntu 20.04

• Update

sudo apt update

• Install Apache

sudo apt-get install apache2

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LRS error

Error message in Chrome developer console when logging into LearningLocker

Unable to connect to "/api/auth/jwt/password”

• Check mongo as root

sudo su -
service mongod status

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To troubleshoot

ionic cordova run browser --prod --release

Updates required to config.xml file

<preference name="SplashScreen" value="assets/images/logo.svg" />
<preference name="SplashScreenBackgroundColor" value="#000" />

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Update root password

omero db password
Please enter password for OMERO root user: 
Please re-enter password for OMERO root user: 
UPDATE password SET hash = 'ibTzrADXfsKFfNwBdQsa+g==' WHERE experimenter_id  = 0;

Check password hash

psql -h localhost omdbprim -U omdbusr1 -c " select * from password"

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To use Lets Encrypt certbot command to install certificate to work with AWS Lightsail Wordpress instance

sudo certbot certonly --webroot -w /opt/bitnami/apps/wordpress/htdocs/ \
-d domain1.org

To add new domains to certificate

sudo certbot certonly --webroot -w /opt/bitnami/apps/wordpress/htdocs/ \
--expand -d domain1.org,www.domain1.org,domain2.edu,domain3.org

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• To reverse all the lines in a file - :g/^/m0

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• Error: "Error: SSL Error: SELF_SIGNED_CERT_IN_CHAIN"

npm config set strict-ssl false