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There are many popular file types for digital video files. AVI, MPEG and MOV are commonly seen video file extensions. While MPEG and MOV are more compressed--and therefore smaller--than AVI files, all of these file types create fairly sizable files, making them less than ideal for portable media devices, such as MP3 players. MP4 is a popular video file format with a small size, making it perfect for MP3 players. It is possible to convert nearly any type of video into the MP4 format.

Read more: How to Convert a Video to MP4 | eHow http://www.ehow.com/how_5093240_convert-video-mp.html#ixzz2VsjOHSJx

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