What is 3G2
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.
What is MP3
MP3 is a digital audio compression algorithm that acheives a compression factor of about twelve while preserving sound quality. It does this by optimising the compression according to the range of sound that people can actually hear. MP3 is currently (July 1999) the most powerful algorithm in a series of audio encoding standards developed under the sponsorship of the Moving Picture Experts Group (MPEG) and formalised by the International Organization for Standardization (ISO).
MP3 is very different from Layer 2, using an additional MDCT layer to increase frequency resolution. Its scale factor groups are more optimised for the human ear, and it uses nonlinear sample quantisation and Huffman coding. MP3 files (filename extension ".mp3") can be downloaded from many World-Wide Web sites and can be played using software available for most operating systems (also downloadable), e.g. Winamp for PC, MacAmp for Macintosh, and mpeg123 for Unix. MP3 files are usually downloaded completely before playing but streaming MP3 is also possible. A program called a "ripper" can be used to copy a selection from a music CD onto your hard disk and another program called an encoder can convert it to an MP3 file.
Windows ships with limited MP3 encoding support. The output sample rate is limited to 24khz and the bitrate is limited 56kbps. However, many add-on packages from open source community make it possible to encode at higher sample rate and bitrate.
A commonly used open source codec is LAME. LAME comes in different forms, including a ACM (Audio compression manager) codec and a DLL (lame_enc.dll). Caution: LAME ACM does not work well on many computers, regardless which software is loading it. It is best to avoid installing LAME ACM and use lame_enc.dll instead.
MPEG.ORG is an excellent source for additional information on MPEG format and usage.
How to Convert 3G2 to MP3 with Torrent All to Mp3/Wav Converter ?
1. To add 3GP source file.
Click on the "Add File" button on the tool bar. The standard file open dialog appears. Select "3GPP/3GPP2 - Mobile Phone Video
(*.3gp;*.3g2)" in its "Files of type" combo box.
2. Select a section with button and to convert or convert the whole 3gp file to Mp3.
3. Check in the boxes of the files that you'd like to do conversion. You can do batch conversion easily with Torrent All to Mp3 Converter.
4. Select Mp3 as output format.
5. Press the Convert button to start conversion from 3gp to Mp3 file.
6. Check on the conversion progress bar, press the Stop button if you want to stop .
7. Open output file folder with play button .
find out its content with Browse button