HandBrake is a free multithreaded video transcoder for MacOS X, Linux and Windows.
To know more about HandBrake click here
To install HandBrake on linux mint
1.Open terminal.To open terminal in linux mint, click Menu button and select terminal or type terminal in the search field and click terminal.
2.Type the below code in terminal and hit enter.
sudo add-apt-repository ppa:stebbins/handbrake-releases
3.Type your linux mint password if needed.
4.Then press enter to continue or ctrl-c to cancel adding the ppa.
5.Type below command and hit enter
sudo apt-get update
6.Then type below command and press enter
sudo apt-get install handbrake-gtk