Thanks to a growing number of "smart phones," flight attendants are often having troubles with passengers who want to enjoy PDA functionality of their phones, but have the wireless transmitter turned off. As you know, the flight's signaling system could easily be interfered by the cell phones' frequency or the wireless transmitters such as Bluetooth earphone and so on. So it is very dangerous for both flights and passengers to use "smart phone" as a cell phone. Unfortunately, there's no easy way for anyone to see quickly if the phone really has its wireless abilities shut off, or if the person is just saying that to keep the flight attendants off their back. So, now, the Consumer Electronics Association is trying to come up with a standard way to display a mobile phone in "flight mode" -- where users can still make use of applications on their phones while up in the sky, without worry of their phones transmitting a wireless signal. It is not an easy job, because businessmen need to keep their "smart phones" on to cover their job or just to kill time.
To meet this demand, almost all the "smart phones" at present are programmed with a special mode named "flight mode" just as mentioned before. What’s more the smart phone can also be used as a mp4 or mp3 player, so when you are in the flight mode you have enough fun out of it. This also brings us a new media format which is called 3GP format. Movie in this format can give you a lossy compressed movie which costs you very little phone’s memory. As a result of its small size, very fit for mobiles with small memory card, 3GP format is appealing to more and more people. It opens up a new way for the programmer to step into a new show room, a way to program software able to convert the familiar formats into 3GP format.
 There are people with enough sensitivity having already begun to rake in from this innovative idea. Google for 3GP video converter, you will easily find that some famous video converter software such as Xilisoft, 3GP converter, Ultra ,etc. have already created new versions supporting conversion of other formatted videos to 3GP mode. Before long you will see even more software companies eager to share this big cake. This tide of competition and innovation will bring much convenience for customers, especially those often on the go. Watching movies during those tedious long journeys really brings along much fun. To experience an adventure movie should be much more exciting in the sky than on the ground.

Having always been keen to join the frenzy of world up ? It’s once every four years! Having the eager to watch games with those of your favorite handsome guys ,Beckham, Kaka, or Owen( I’m sorry he just left for England a bit earlier)? But different time zones have played its bad role on this dream. Well, it’s not your fault anyway , since staying up late will quite possibly make you end up being late for work the following day, and it’s really a matter you’ve always tried to steer away from. Then is there a way to balance these two important parts of your life during this month logoed with WORLDCUP? Thanks to telecom development, and innovative mobile phone makers, this is no longer a tough problem!

All you have to do is record the game while you’re in dream ,convert the video file to 3GP ,load it to your cute mobile and ,here we go, watch the game while on your way to work or anytime in your convenience. A great idea? Absolutely.

3G development ,for all its shortcomings and bugs to be addressed ,has already reached a point where customers can expect many features over 2G. And accordingly, 3G mobiles have managed to make many once day-dreams come true, and watching movie while on the go is one of many other functions.

But mobiles made by different companies may support different file formats, so you should make clear of what kind of format your Nokia or Motorola or any other brand phone supports.But there is a universally supported format .3GP is a ratified format by the organization 3GPP as a video format to transmit streaming media.So the common practice is convert the commonly used audio/video formats AVI,MPEG etc.to 3GP, or if your mobile supports MP4,to MP4.

Many people may have no idea about the conversion work and the many different formats, but don’t fuss about it .It simply cost you some attention to different converters and pay an affordable bill to buy a powerful soft and then leave the soft to do all the chores for you.Among the many trial version of converters I’ve used ,I’d like to recommend Xilisoft 3GP converter ,it’s easy to use and supports many amazing funcions. And most importantly it is low-priced, a really powerful bargain.

It seems that more and more people come to wonder about the many formats of audio and video. This curiosity arose for certain reasons. As you know ,3G mobiles are upgraded with each passing day , portable gadgets such as PDA are quite on the way to ubiquity, and necessarily accompanied by the enhancement of bandwidth, some ABCs about audio and video become a must. Since if you are lost about what kind of format your gadget supports, problems will dog you.

There are various ways to encode audio and video, among which the usually used ones are classified into the following several kinds:
MPEG: the mainly used formats for videos are MPEG1(also referred to as vcd),MPEG2(used by DVD),MPEG(DVDIP uses its variations as divx ,xvid,etc.)and MPEG4 AVC( very hot now);
For audio format ,MPEG Audio Layer 1/2,MPED Audio Layer3( that’s mp3),MPED-2 AAC,MPEG-4 AAC etc. Attention: MPEG is not applied for DVD audio .

H.264 series: its family includes H262、H263、H263+、H263++、H264(combination of MPEG AVC)

Microsoft windows media series: ( Well, big guy always has his own way of doing things)~~
Its video format has MPEG-4 v1/v2/v3( based on MPEG4,DIVX3),Windows Media Video 7/8/9/10
Audio formats: Windows Media audio v1/v2/7/8/9
Then the familiar Real Media series: First, I’d like to make it clear that the format of Real here has nothing to do with rm or rmvb files~~
Video formats : Real Video G2( early version),Real Video 8/9/10
Audio formats:Real Audio cook/sipro（also early version）,RealAudio AAC/AACPlus etc.

QuickTime series: ( a kind of platform, with many kinds of coders)
Video formats: Sorenson Video 3( for QT5, a ratified standard),Apple MPEG-4,Apple H.264
Audio formats:QDesign Music 2,Apple MPEG-4AAC (a hot one )

I want spend a few more words about the audio formats of DVD, it applies some relatively independent formats, such as AC3, DTS

File formats(container):
AVI
Audio/viedo interleave, the most ubiquitous audio/video container format, which support the most audio and video formats

MPG
The audio/video container for MPEG，has a streaming attribute. It can be further classified into PS,TS, used respectively as a container for DVD and HDTV .

VOB
The audio/video container format for DVD, supports multi-video ,multi-track, and multi-title etc.

MP4
The audio/video container format for MPEG-4,based on QuickTime MOV ,and features many superiorities.

3GP
3GPP uses 3GP as a video format to transmit streaming media.

ASF
Windows Media applies ASF as its audio/video container ,to be used for transmitting streams, script included.

RM
Real Media uses RM to transmit streams

MOV
The audio/video container for QuickTime ,maybe the most powerful container at present. Besides many common technologies it supports, it even upholds virtual reality and java, an edge over its variations such as MP4 and 3GP.

WAV
A kind of audio container. People often refer to WAV as the unzipped PCM code, but as a matter of fact, WAV also includes other ACM zipping codes such as MP3.

MP3
MPEG Audio Layer 3 ,as has been mentioned above.

Conversion between different formats
There are many converters out there ,making people confused about which on earth is a more proper one, both in quality and price. Here ,I recommend Xilisoft video converter- an expert in conversion between different audio and video formats. It is powerful and easy to use.

The knowledge about audio and video formats is numerous and jumbled ,and I’m here giving only some ABCs, and hopefully provide a thread to welcome more tech-savvy guys to add to the guide in order to help those still a bit confused.

Up to now, there have been many video formats in use, among which the commonly applied are AVI, ASF, MPEG/MPG/DAT, DIVx, MOV, RM, RMVB. There is a relevant player for each formatted video. QuickTime for MOV, Real Player for RM, just take these two examples. You know, we can’t own players for all formats. As 3G phone is well entrenching on the realm of conventional handset market, watching movie on-the-go has become a kind of fashion. But at least for the time being, the formats supported by 3G phones are anything but many. Then how to make that ‘movie your commute’ be realized? Conversion from those alienated formats to accepted ones is the answer. Following the article, you will get to know something about this trick.
   
VCD to MPEG-4
The first step is to convert DAT, the file of VCD, to MPEG-1.To make this done, you can harness the re-recoding function of Super Codec, and convert the needed section to AVI file , and store away. Then use VirtualDub 1.3 to complete the conversion, creating a MPEG-4 video file. VirualDub supports ‘Normal’ and ‘Highest’ converting rate, for background and fast conversion respectively. MPEG-4 file is 3 times smaller than the original one, and allows you to optimize every part of the movie, while maintaining compatibility. The format contains a wide variety of compression technologies to deliver the best performance for every kind of content.

RM-3GP
RM ,for its small size and little loss of original video , has gained a popular application on the Internet. But currently only a few smartphones support RM, then how to make you handset play this Internet borne video? Use Xilisoft 3GP video converter to click the whole process. This software offers multithreading and batch conversion, and so just a click ,you can convert several files into 3GP video ,at the same time. 3GP, created to work in a fast data transmission network, is supported by all 3G phones.

RMVB-3GP
RMVB, an extension of enhanced RM, takes on an even smaller volume as a result of its variable sampling rate technology. Advantage in one aspect always comes at the cost of other aspects. For RMVB, its convenience brought about by the small size leads to a headache, the difficulty of conversion. Few converters nowadays support this format. Winavi is a powerful converter able to converter rmvb files into mpeg2,dvd, etc. making it easier to converter further into 3gp.

There are many other converters out there in the market, such as Ultra, Cucusoft, etc. As the technology of hardware and software is improving by the day, means to convert video/audio files will get more various and convenient.

Up to now, there have been many video formats in use, among which the commonly applied are AVI, ASF, MPEG/MPG/DAT, DIVx, MOV, RM, RMVB. There is a relevant player for each formatted video. QuickTime for MOV, Real Player for RM, just take these two examples. You know, we can’t own players for all formats. As 3G phone is well entrenching on the realm of conventional handset market, watching movie on-the-go has become a kind of fashion. But at least for the time being, the formats supported by 3G phones are anything but many. Then how to make that ‘movie your commute’ be realized? Conversion from those alienated formats to accepted ones is the answer. Following the article, you will get to know something about this trick.
   
VCD to MPEG-4
The first step is to convert DAT, the file of VCD, to MPEG-1.To make this done, you can harness the re-recoding function of Super Codec, and convert the needed section to AVI file , and store away. Then use VirtualDub 1.3 to complete the conversion, creating a MPEG-4 video file. VirualDub supports ‘Normal’ and ‘Highest’ converting rate, for background and fast conversion respectively. MPEG-4 file is 3 times smaller than the original one, and allows you to optimize every part of the movie, while maintaining compatibility. The format contains a wide variety of compression technologies to deliver the best performance for every kind of content.

RM-3GP
RM ,for its small size and little loss of original video , has gained a popular application on the Internet. But currently only a few smartphones support RM, then how to make you handset play this Internet borne video? Use Xilisoft 3GP video converter to click the whole process. This software offers multithreading and batch conversion, and so just a click ,you can convert several files into 3GP video ,at the same time. 3GP, created to work in a fast data transmission network, is supported by all 3G phones.

RMVB-3GP
RMVB, an extension of enhanced RM, takes on an even smaller volume as a result of its variable sampling rate technology. Advantage in one aspect always comes at the cost of other aspects. For RMVB, its convenience brought about by the small size leads to a headache, the difficulty of conversion. Few converters nowadays support this format. Winavi is a powerful converter able to converter rmvb files into mpeg2,dvd, etc. making it easier to converter further into 3gp.

There are many other converters out there in the market, such as Ultra, Cucusoft, etc. As the technology of hardware and software is improving by the day, means to convert video/audio files will get more various and convenient.

Though a newbie to this forum, some knowledge about audio and video format conversion enables me to be a problem-cracker,and surely with a keen interest in holding out my helping hand~~~Flipping through the threads ,I find many guys bothered with the conversion of different formats in order to play your favorite videos on 3G mobiles. Well, watching movies on the way to work appeals to many.~~~ I’m glad to show you a soft able to do the chore for you with ease and high-quality. I call it the terminator~~
It is Xilisoft 3GP video converter ( an updated version),which helps you convert various formats including DVD, VCD, SVCD, MOV, RM, AVI, MPEG, WMV, MPEG to 3GP, 3G2, MPEG4 and so on. You can also extract audio from video file and save it as MP3 or WAV. It also can convert audio-only 3GP files to MP3, WAV.
Follow me ~~
1.Download, install, and run Xilisoft 3GP Video Converter.
2. Load the file(s): Click the "Add" button in the main interface or choose "Add" in the "File" menu to add the original files you want to convert.
 
3. Highlight the file you want to convert, then the software will automatically detect the "Duration" and "Bit Rate" of the loaded file, and some advanced info such as the video and audio codec will also be detected. You can find the file information in the recording area.
 
Tip: It supports multithreading and batch conversion. You can select all files you want to convert and Xilisoft 3GP Video Converter will automatically encode them, even if these files use different settings.

4. You can preview the file in the left preview window to confirm whether you loaded the right file or not. Just click to play it. When the movie is playing, will be all available. Please Note: This function is only for preview purpose.

 

Tip: Use "Remove" button to remove the loaded file which you highlight. This can help you remove the wrong file. Use "Clear" button to clear all the files loaded. Those buttons can also be found in the "File" menu.
5. Select the target output format: In "Profile" combo-box, you could choose what format you want to convert your files to. And all the target formats are shown in the dropdown list.

well, no more pictures allowed here ,but you can check futher steps from this link:
http://www.xilisoft.com/3gp-video-co.../tutorial.html
if you have any trouble with using this gear, pls put up your question and i'll try my best to your help you out ~~~~