What is Windows 8 ? | About Windows 8 Operating System

What is windows 8 ?

          Windows 8 is an operating system produced by Microsoft for use on personal computers, including home and business desktops, laptops, tablets, and home theater PCs.

About Windows 8

          Windows 8 employs a new user interface based on Microsoft's Metro design language. The environment features a new tile-based Start screen similar to that of the Windows Phone operating system, which has replaced the previous Start menu entirely. The Start screen displays a customizable array of tiles linking to various apps and desktop programs, some of which can display constantly updated information and content through "live tiles".
 As a form of multi-tasking, apps can also be snapped to the side of a screen.

fMP4 - Fragmented MP4 - fMP4 Boxes

A fragmented MP4 file contains a number of discrete units called boxes (also known as atoms).
Three key boxes in the fragmented MP4 approach are the ‘moov’, ‘moof’ and ‘mdat’ boxes:

• ‘moov’ (movie metadata box) contains a virtual movie timeline with display characteristics, duration and timescale elements, as well as subboxes providing information for each movie track.



• ‘mdat’ (media data box) contains media data, raw audio and video information and timed-text elements that are decoded based on a movie box’s information.

• ‘moof’ (movie fragment box) contains short audio, video or text portions of an elementary stream. Movie fragments typically house a closed GOP (Group of Pictures) or AVC Coded Video Sequence.
 

MPEG-4 file sources did not originally support MP4 file streaming but MPEG is now exploring DASH (Dynamic Adaptive Streaming over HTTP) using MP4 elementary stream fragments as network packets for HTTP streaming delivery.

Coupling an ‘mdat’ and a ‘moof’ creates an fMP4 movie fragment that includes one track fragment (either audio or video) with sufficient metadata to make it independently decodable. Using movie fragments to create packets optimized for adaptive streaming is similar in concept to RTP packets of audio/video, but fMP4 movie fragments are optimized for bitrate switching and HTTP delivery over unreliable networks.