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       Nowadays, there are a lot of popular multimedia formats in the world, and each of them is lucky to have its own sphere of using (Video Home System, Internet Video Streaming, Video Editing…) or is specially created for personal multimedia devices.

Some kinds of devices and programs support only those formats that are specially created for them only.

It is common knowledge that there are a lot of multimedia devices (DVD players, Mobile phones, iPod, PSP, Zune, PlayStation, Archos…) and different audio/video data carriers (DVD, Internet, Blue Ray, HDD, Flash USB storage…), that it is quite an easy matter even for an experienced user to face the difficulties while choosing the most suitable one.

And it is really appears to be very complicated, because practically all the devices are created by universal brands, for example, Microsoft, Apple, Sony, that can be called competitors; and the products, they are promoting, sometimes appear to be incompatible  not only with each other, but also with PC.

Such restrictions are made because of creating special video formats for particular devices.

 

For example:

If you are lucky to have a player iPod of the company "Apple", then, in order to play your video file on it, you need to have the file of the next resolution: ".mp4" or "m4v" , for example, "video.mp4"; in contrast to the mentioned iPod, a  media player Zune from Microsoft can play the video files with ".wmv" resolution. So, if you have an iPod player, but the resolution of the video file is ".wmv" or the other one, different from ".mp4", ".m4v", then, it means, that you will not have a chance to view it on your device.