For some reson Nintendo decided not to include the dvd play-back function into the wii.

But it is now possible thanks to some amazing work by Team Twiizers

You Will Need:

A Wii (Duh!)
A Sd Card
A Way For You Wii To run Homebrew

If your wii is not ready to run homebrew yet i recomend this instructable by btop

https://www.instructables.com/id/Wii-Homebrew---Twilight-Hack/

Disclaimer at Last step, Please Read before attemping this instuctable,

Please also bear in Mind this is my first instuctable (:

Step 1: Downloading the Files

If you have followed btop's instuctable and installed the homebrew channel this should all be pretty easy.

You will need to download 2 sets of files

"libdi" and "mplayer", both can be found here :
http://hackmii.com/2008/08/libdi-and-the-dvdx-installer/

If you have a modchip you will need the other file on that page, "pactchmii_core"

Step 2: Installing

Now you will find a ".dol" file in the folder which you downloaded called "DL", rename this file to "boot.dol" and place it in a folder in the "apps" folder on you Sd Card.
The Run this file through the homebrew channel.

If your console has a mod chip, click "patchmii install" if not proceed with the normal install.

Step 3: The Dvd Player

Now you will need to add the contents of the second folder you downloaded (which should be named "mplayer-r2...") into the "apps" folder onto your sd. Then Like before boot this through the homebrew channel.

Step 4: Running the Software

Now once you have opened up the homebrew channel you will find the application "mplayer"
Run this and then you are ready to play your dvd's

In actual fact, mplayer can do more than play dvd's, it can also play files off the sd card, although this in quite buggy at the minute due to the fact that most of the effort was put into making it read dvds.

Step 5: Controls

This can be quite confusing at first, but to control the software you will need to use the up and down arrows on the wiimote to hi-light an option then you will use the right arrow to select it, the left arrow will take you back the previous menu.

To play your dvd you will need to scroll down the "DVD-Video" option then press the right arrow on the wiimote, it may take some time but after this your wii will eventually start playing the dvd. (: Sucess

Step 6: Disclaimer

It is said that due to the way that the wii reads disc's that this MAY damage the laser, BUT it is also said this is a myth.

So Bearing This in mind, i am in NO WAY resposnible if you happen to damage your wii in any way while following these instuctions, this is done entirely at your own risk.

Thank you (:

Also I Am not claiming the applications are mine, they are the work of team twizzer's