The iPhone 4S is the fifth generation of iPhone, and successor to the iPhone 4. It retains the same form factor as iPhone 4 but includes many upgrades such as the A5 processor, iOS 5, and an improved camera.
If you want to watch DVD movies on your iPhone
4S, you need to find a conversion program that will convert DVD to
iPhone compatible format first. Then you will be able to transfer the
output video files to your iPhone 4S with the sync of iTunes.
The following step-by-step guide shows you how to convert DVD to iPhone 4S video using DVD to iPhone 4S Converter and transfer DVD to iPhone 4S:
Step 1. Add DVD Movies
Download the latest version of DVD to iPhone 4S Converter (download link). Install and launch it.
the "Open DVD" button to load the DVD movie. Alternatively, you can
click "File -> Open DVD..." to import the DVD disc. After the DVD is
imported, there will be a list of DVD titles showing in the program.
Tick the longest DVD title from the list. Double click this title and you will preview the movie in the program.
Step 2. Choose Output Format
the "Profile" drop-down list, navigate to the "Apple iPhone" category
and choose "iPhone MPEG-4 Video" as the output format. Note: You can also customize a specific profile to meet your needs.
Step 3. Start Converting DVD to iPhone 4S Video
Click "Start Encode" to start to convert DVD to iPhone 4S video.
Step 4. Transfer Output Video to iPhone 4S
Add the output files to iTunes and sync them to your iPhone 4S.
Audio formats supported by iPhone 4S include:
(8 to 320 Kbps), Protected AAC (from iTunes Store), HE-AAC, MP3 (8 to
320 Kbps), MP3 VBR, Audible (formats 2, 3, 4, Audible Enhanced Audio,
AAX, and AAX+), Apple Lossless, AIFF, and WAV
Video formats supported by iPhone 4S include:
video up to 1080p, 30 frames per second, High Profile level 4.1 with
AAC-LC audio up to 160 Kbps, 48kHz, stereo audio in .m4v, .mp4, and .mov
file formats; MPEG-4 video up to 2.5 Mbps, 640 by 480 pixels, 30 frames
per second, Simple Profile with AAC-LC audio up to 160 Kbps per
channel, 48kHz, stereo audio in .m4v, .mp4, and .mov file formats;
Motion JPEG (M-JPEG) up to 35 Mbps, 1280 by 720 pixels, 30 frames per
second, audio in ulaw, PCM stereo audio in .avi file format
Source from http://www.clone2go.com/tutorials/convert-dvd-to-iphone-4s.php