In order to watch videos in to different devices you must have to convert your videos into different formats.Most of the videos come in the format of .AVI which can be run in computer but not all the devices support .AVI.There are lots of converting softwares available on internet but most of them are not free i also had lots of problem finding a good free converter.While searching i found a great free converter which can convert DVD Movies files (.AVI) into Flv/Mp4/WMV/MPEG4/MPEG for free.

Automen is a free GUI for Mencoder that can perform video conversions across multiple formats and
encoders. It supports XviD (for AVI encoding), FLV, X264 (MP4 for Ipod/PSP/PS3), WMV, MPEG4, MPEG2, and
Huffyuv and is designed to be simple and straightforward for quick video conversion.Automen has got some awesome features which i have never seen on any free video converter.Two of it feature which i like the most is auto calculating height you just need to enter desired widht and it will calculate the according
to aspect ratio and another good is encode by desired files size.

All features of Automen is given below.

1) Set output width, not output resolution:
2) Encode by desired file size, not bitrate
3) Supports multithreaded processing
4) Offers multiple encoding quality settings
5) Process only video, only audio, or both
6) Split output videos into multiple files
7) Normalize audio
Self contained
9) Other advanced functions
10) Containers
11) Batch encoding
12)Source code

Download : AutoMen