Launched in 2007, the iPod Touch is a device produced by Apple that runs on the iOS operating system. This range of products took the classic music playing iPod and added a touch screen interface, wireless connectivity and access to the Apple App Store. The product has been extremely popular, selling over 80 million units. Although similar in appearance to the iPhone, the iPod Touch is unable to connect to cellular networks, using WiFi for wireless connectivity. The latest version features front and rear facing cameras and comes in a range of colours. Typical uses for the iPod Touch are to listen to music, take photos, watch videos and use the variety of third party apps available.
The iPod Touch has undergone dramatic improvements throughout its various iterations. The original iPod Touch had a 3.5 inch screen at a resolution of 480x320 pixels at 163 pixels per inch. This has gradually increased with the 5th generation iPod Touch sporting a 4 inch screen with a resolution of 1136x640 pixels at 326 pixels per inch, the same as the iPhone 5. The screen aspect ratio of the devices vary too, with the latest version featuring 16:9 screen ratio. In order to enjoy optimal video for the device the appropriate resolution, aspect ratio and format must be chosen. The video formats supported by the iPod Touch are H.264, MP4, M4V, MOV and Motion JPEG. However while the iPhone 5 supports video at 1080p, the iPod Touch only supports video up to 720p.
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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