Answer by
PJ24 (220)
MP4 or MPEG-4 is a compression standard for video. There's the standard MPEG-4, which is Apple's Quicktime standard, and there's Microsoft's MPEG-4 standard, which is based on DivX. There are a lot of devices that can play this compression standard, as it is fairly common. Most modern portable devices with a screen should have no problems with this.