HandBrake

HandBrake is an open-source, GPL-licensed, multiplatform, multithreaded video transcoder, available for MacOS X, Linux and Windows.It does not include any code to decrypt commercial DVDs. Yes, we know, it used to, but it does not anymore.However, we respect your right to take matters into your own hands.In Mac OS X, if HandBrake detects you have installed the open source VLC 0.9.x media player in your root Applications folder, it will ask you if you want to decrypt DVDs using that applications copy of the libdvdcss library. Similarly, in Linux, if you have chosen to install the open source libdvdcss library on your system, HandBrake will allow libdvdread to use it for decryption.

Why to rip DVDs to a hard drive before encoding with HandBrake. The main reason to read from a ripped VIDEO_TS or .iso, stored on your hard drive is that HandBrake does not even attempt to decipher the latest copy protection schemes. Many DVDs, especially recent, popular films, must be run through other tools first, like AnyDVD.

Desite this, one might still argue that using HandBrake to encode directly from the DVD simplifies the process by removing the extra step of copying the movie. However, reading the video information from your optical drive is somewhat slower than reading from your hard drive and prevents you from using your optical drive for anything else for the duration of the encode. It is also a little harder on the drive itself.
As a result, if you have the hard drive space required for a full VIDEO_TS folder (up to around 9GB), most people recommend that you rip the DVD to your hard drive first and then use that as the source for HandBrake.

Supported sources:
>Any DVD-like source: VIDEO_TS folder, DVD image or real DVD (unencrypted--protection methods including CSS are not supported internally and must be handled externally with third-party software and libraries), and some .VOB and .TS files
>Most any multimedia file it can get libavformat to read and libavcodec to decode.

Outputs:
>File format: MP4, MKV, AVI or OGM
>Audio: AAC, MP3, Vorbis or AC-3 pass-through (supports encoding of several audio tracks)
>Video: MPEG-4, H.264, or Theora (1 or 2 passes or constant quantizer/rate encoding)

Other features:
>Integrated bitrate calculator
>Picture deinterlacing, cropping and scaling
>Chapter selection
>Basic subtitle support (burned into the picture)
>Grayscale encoding

Is simple to convert video files to desired format. Transform them fo ipod,iPhone, AppleTV ,animation,film, television etc.