nothing
Basically, MP3 is an audio file format, MP4 is a video file format. You can download movies onto a MP4 player and watch them back.
on call of dutty 4&5 mp4 is a different class of the mp marksmen class then the different class of the mp5 .there for that's the difference...............................................................
MP9 is not a media player, not a normal one when you are thinking about mp3 or mp4 players. MP9 is actually digital video recorder in the shape of a pen. MP9 is the name of that product.
No that's why it's called an MP3 player...
Unfortunately, there isn't a way of converting it unless you buy a MP4.
mp4 conversions are faster and more advanced than mp3 conversions. Additionally, mp4 holds more data than the later. It may cost a little more to get technology that holds mp4 but it is honestly worth it in the end.
An MP3 is one of the most common sound file formats currently used in digital music devices. Similarly, an MP4 is a video file format. An MP4 player generally supports both MP3 and MP4 formats, meaning that it can play both music and video. An MP3 player, unless otherwise stated by the manufacturer of the device, generally does not support the MP4 format or other video formats.
Depends what mp4 player do you have?
You can by downloading an app on your PC/laptop then plugging your mp4 into it and downloading on your mp4. (it wont work if you have an mp3 it must be mp4)
They are the same things but I have an iPod Touch and an mp3 player but I use the iPod much more because you can have APPS on it :)
iPod and mp4 have the same quality. mp4s are better than mp3s. iPod and Mp4
nothing thats it