Fix Inverted Camera on Ubuntu Linux

I am running Lucid Lynx 64 bit OS version on my Asus i3 K52J Series laptop. Like everyone else, I like using Skype video/chat as well as Cheese camera for taking pictures and videos. Not until then when I had a problem using it.

NOTE: Not advisable to do "export LIBV4LCONTROL_FLAGS=3", LIBV4LCONTROL_FLAGS is for debugging purposes only. - by Hans De Goede(libv4l author and maintainer)

I was so disappointed that my camera display was inverted! I tried reading several blogs and posting comments on Ubuntu forum threads online for days and but none of their solutions helped solved my problem. It could have been easily solved if only there was an option to invert my camera on Video4Linux Device Preference. Sadly, there was not! So, I decided to find a way to flip the camera by looking into export options on gtk-v4l(Video4Linux). 

Backup or Restore PostgreSQL Database

There is an easy way to create backup file and restore your current PostgreSQL database using the Linux terminal. I am not sure though if this is the easiest way.

As of the moment I am writing this article, I used the following command to backup and restore my database. 

Using pg_dump and psql will make your life easier. Below are the terminal command I use to backup and restore my database.

• Backup : pg_dump -U {user_name} {database_name} -f {backup_file_name}
• Restore : psql -U {user_name} -d {database_name} -f {backup_file_name}

If you are getting an error:

Properties File with Arguments or Pameters

The goal on this tutorial is to be able to format a value on a properties file given its parameter or arguments. It is best describe as passing value as a parameter and inserting those values on the string retrieved from the properties file.

To better understand what I'm doing, read and understand my example code below.

Property File Sample

message.welcome= Welcome {0} to {1}!
message.thank= Thank you for you visit {0}.

Separate Configuration for Play Framework / Play2 production, testing and development environment

Working on Play Framework configuration is easy. In this article, I'll walk you through simple implementation where you are able to create a generic application.conf and a dedicated application.conf for each environment.


Objective: To be able to easily manage your Play2 application configuration separately for production, testing and development.

Solution: Override GlobalSettings onLoadConfig to point to a commong configuration and a fallback configuration specific for your current environment. Your code should look like below.