Download and install AVS Video Converter.

Run AVS Video Converter and select your input video file.

To select a video you would like to convert hit the Browse... button next to Input File Name Field. In the opened Windows Explorer Window browse for the necessary DVD folder:

NOTE! When your input is a DVD Disc, you will need to select the path to your source file: X://Video_TS/Video_TS.IFO. "X" stands for your DVD-ROM or the hard disk drive folder where your DVD is stored:

It is important to select the IFO file, rather than VOB file, because the IFO file contains the information about the entire DVD structure and this way you will avoid audio and video de-synch problems when converting.
Also, most DVDs have several VOB files (files with actual video)and if you convert VOBs instead of IFO, you will have to merge them afterwards, which is not the case with the IFO files.

Set up the conversion parameters.

After you have selected the video input file, press one of the buttons on the main panel to select the necessary format to convert your video file into - To AVI, To DVD, To MP4, To 3GP, To MPEG, To MOV, To WMV, To RM, To SWF. In the list of Profiles select one of the offered profiles. You can also edit the selected profile using the Edit Profile... button:

Note, that if you convert the DVD for a specific device you should read the device documentation to find out what video files it can playback before you select the output video format.

Set up a proper path for your output video file.

Click the Browse... button next to Output File Name field and select a location on your HDD for the output video file:

NOTE! When you select a location for your output video file, you should save the file to your personal computer HDD.

Convert your video files.

After you have set up all the conversion parameters, hit the Convert Now! button to start converting.

The result of the conversion should be a video file of the selected format.

If you convert the DVD into one of the mobile formats, the AVS Mobile Uploader application will be launched automatically to let you upload the video onto your mobile phone or portable player.