DVD (also known as "Digital Versatile Disc" or "Digital Video Disc") is a popular optical disc storage media format. Its main uses are video and data storage. Most DVDs are of the same dimensions as compact discs (CDs) but store more than six times as much data.
DVD-Video discs respectively refer to properly formatted and structured video content. It uses MPEG-2 for video compression, with AC-3, DTS or MPEG audio for multi-channel audio support.
To decode DVD, you will need both GPL MPEG-2 Decoder, and AC-3 Decoder.
The 3rd Generation Partnership Project (3G/3GPP) is a collaboration agreement that was established in December 1998. The 3GPP and 3GPP2 specifications call out specific types of media that can exist in .3gp and .3g2 files.
Once you move a video from cell phone to your PC, the easiest way to play it is to use Apple's QuickTime Player.
In general, if a cell phone record a 3g2 video, it should conform to the 3G2 standard. However, a cell phone may not has the ability to play all variety of 3G2 videos due to limited codec support on the cell. Thus, it is easy to convert a cell phone 3G2 to a video format playable on a computer, but it is not so easy to convert a PC video to a 3G2 which is compatible with your particular brand of cell phone.
To encode 3GP video in River Past software, you will need River Past 3GP Booster Pack, and need to have Apple QuickTime installed.
River Past Video Cleaner