In 2007 Apple released the first of its range of iPhones. The touch screen device completely revolutionised the smartphone market and the iPhone established itself as the leading cutting edge mobile device. The iPhone introduced intuitive gestures such as pinching to zoom in which allowed users to enjoy content such as webpages and images more easily from a smaller screen. As of Q3 2012, Apple has sold over 200,000 iPhones. The range has undergone six revisions. The iPhone also saw the introduction of the App Store, a marketplace that allows users to create and sell their own applications for use on the smartphone. The success of apps has led to the creation of a new industry and attempts from all of Apple's rivals to create an imitation app repository for their devices.
With the exception of the larger iPhone 5, all devices in the iPhone range feature 3.5 inch screens, with a 3:2 aspect ration. The early iPhone and iPhone 3G both featured resolution up to 480x320 pixels at 163 pixels per inch. As with other iOS devices a number of video formats are supported, including H.264, M4V, MP4, MOV and Motion JPEG with a bitrate up to 30 frames per second. The recommended audio encoding is AAC. The iPhone 3GS supports a resolution up to 640x480. The range of resolutions supported will affect the types of video that can be used on the devices, with some higher resolution video incompatible with earlier iPhones.
MP4 files (MPEG-4 Part 14) are multimedia files. MP4 is a container format that can store video, audio and subtitle data (as well as more depending on content). Since stores like iTunes uses this container format, and it is used with iPod and PlayStation Portable (PSP), MP4 files have become more common.
MPEG-4 Part 14 or MP4, formally ISO/IEC 14496-14:2003, is a multimedia container format standard specified as a part of MPEG-4. It is most commonly used to store digital video and digital audio streams, especially those defined by MPEG, but can also be used to store other data such as subtitles and still images. Like most modern container formats, MPEG-4 Part 14 allows streaming over the Internet. A separate hint track is used to include streaming information in the file. The only official filename extension for MPEG-4 Part 14 files is .mp4.
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