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QuickTime is an extensible multimedia framework developed by Apple Inc., capable of handling various formats of digital video, picture, sound, panoramic images, and interactivity.
As of OS X Lion, the underlying media framework for QuickTime, QTKit, is deprecated in favor of a newer graphics framework, AV Foundation.[4] The QuickTime X player however is still included with the new releases of the OS.
Software development kits (SDK) for QuickTime are available to the public with an Apple Developer Connection (ADC) subscription. QuickTime Player 7 is limited to only basic playback operations unless a QuickTime Pro license key is purchased from Apple. Editing clips through the cut, copy and paste functions, merging separate audio and video tracks, and freely placing the video tracks on a virtual canvas with the options of cropping and rotation. Decoding video and audio, then sending the decoded stream to the graphics or audio subsystem for playback. A "component" plug-in architecture for supporting additional 3rd-party codecs (such as DivX). PictureViewer is a component of QuickTime for Microsoft Windows and the Mac OS 8 and Mac OS 9 operating systems.
Other file formats that QuickTime supports natively (to varying degrees) include AIFF, WAV, DV-DIF, MP3, and MPEG program stream. By 2000, MPEG-4 formats became industry standards, first appearing with support in QuickTime 6 in 2002. QuickTime 6 added limited support for MPEG-4; specifically encoding and decoding using Simple Profile (SP). Because both MOV and MP4 containers can use the same MPEG-4 codecs, they are mostly interchangeable in a QuickTime-only environment. In QuickTime Pro's MPEG-4 Export dialog, an option called "Passthrough" allows a clean export to MP4 without affecting the audio or video streams. Apple released the first version of QuickTime on December 2, 1991 as a multimedia add-on for System Software 6 and later. The first commercial project produced using QuickTime 1.0 was the CD-ROM From Alice to Ocean. Apple released QuickTime 2.0 for System Software 7 in February 1994—the only version never released for free.
Following Bruce Leak's departure to Web TV, the leadership of the QuickTime team was taken over by Peter Hoddie. In 1994, Apple filed suit against software developer San Francisco Canyon for intellectual property theft and breach of contract.[31] Apple alleged that San Francisco Canyon had helped develop Video for Windows using several thousand lines of stolen QuickTime source code. QuickTime 3.0 added support for graphics importer components that could read images from GIF, JPEG, TIFF and other file formats, and video output components which served primarily to export movie data via FireWire.
The QuickTime interactive movie was to have been the playback format for the next generation of HyperCard authoring tool.
Graphics exporter components, which could write some of the same formats that the previously introduced importers could read. Realtime rendering of effects & transitions in DV files, including enhancements to DV rendering, multiprocessor support, and Altivec enhancements for PowerPC G4 systems.

Support for using Core Image filters in Mac OS X v10.4 on live video (Not to be confused with Core Video). Apple dropped support for Flash content in QuickTime 7.3, breaking content that relied on Flash for interactivity, or animation tracks. The reason for the jump in numbering from 7 to 10 (X) was to indicate a similar break with the previous versions of the product that Mac OS X indicated.
QuickTime 7 may still be required to support older formats on Snow Leopard such as QTVR, interactive QuickTime movies, and MIDI files. The software got an increment with the release of Mavericks, and as of June 2015, the current version is v10.4. QuickTime consists of two major subsystems: the Movie Toolbox and the Image Compression Manager.
QuickTime 7 for Mac introduced the QuickTime Kit (aka QTKit), a developer framework that is intended to replace previous APIs for Cocoa developers. QuickTime 7.6 has been found to disable Macintosh users' ability to play certain games, such as Civilization IV and The Sims 2. First made in 1991, the latest Mac version, QuickTime X, is currently available on Mac OS X Snow Leopard and newer.
There are some other free player applications that rely on the QuickTime framework, providing features not available in the basic QuickTime Player. This is often, but not always, either hidden or intentionally blocked in the standard mode. QuickTime Player X lacks cut, copy and paste and will only export to four formats, but its limited export feature is free. No installer for QuickTime 7 is included with these software packages, but users can download the QuickTime 7 installer from the Apple support site. With additional QuickTime Components, it can also support ASF, DivX Media Format, Flash Video, Matroska, Ogg, and many others. Advanced Simple Profile (ASP) features, like B-frames, were unsupported (in contrast with, for example, encoders such as XviD or 3ivx).
The lead developer of QuickTime, Bruce Leak, ran the first public demonstration at the May 1991 Worldwide Developers Conference, where he played Apple's famous 1984 TV commercial in a window at 320?240 pixels resolution. This added the SuperMac-developed Cinepak vector-quantization video codec (initially known as Compact Video). Version 1.0 of QuickTime for Windows provided only a subset of the full QuickTime API, including only movie playback functions driven through the standard movie controller.
It added support for music tracks, which contained the equivalent of MIDI data and which could drive a sound-synthesis engine built into QuickTime itself (using a limited set of instrument sounds licensed from Roland), or any external MIDI-compatible hardware, thereby producing sounds using only small amounts of movie data.
As part of the development effort for cross-platform QuickTime, Charlton (as architect and technical lead), along with ace individual contributor Michael Kellner and a small highly effective team including Keith Gurganus, ported a subset of the Macintosh Toolbox to Intel and other platforms (notably, MIPS and SGI Unix variants) as the enabling infrastructure for the QuickTime Media Layer (QTML) which was first demonstrated at the Apple Worldwide Developers Conference (WWDC) in May 1996.
They improved the music support and added sprite tracks which allowed the creation of complex animations with the addition of little more than the static sprite images to the size of the movie. Apple also licensed several third-party technologies for inclusion in QuickTime 3.0, including the Sorenson Video codec for advanced video compression, the QDesign Music codec for substantial audio compression, and the complete Roland Sound Canvas instrument set and GS Format extensions for improved playback of MIDI music files.

Although similar in concept to the wired movies feature released as part of QuickTime 3.0, QuickTime interactive was much more ambitious. Development of QuickTime 6 for Mac OS slowed considerably in early 2003, after the release of Mac OS X v10.2 in August 2002. Security concerns seem to be part of the decision.[59] Flash flv files can still be played in QuickTime if the free Perian plugin is added.
QuickTime X is fundamentally different from previous versions, in that it is provided as a Cocoa (Objective-C) framework and breaks compatibility with the previous QuickTime 7 C-based APIs that were previously used. In such cases, a compatible version of QuickTime 7 is included on Snow Leopard installation disc and may be installed side-by-side with QuickTime X. The Movie Toolbox consists of a general API for handling time-based data, while the Image Compression Manager provides services for dealing with compressed raster data as produced by video and photo codecs.
This framework is for Mac only, and exists as Objective-C abstractions around a subset of the C interface. Each track either contains a digitally encoded media stream (using a specific format) or a data reference to the media stream located in another file. It could play video at 320?240 resolution at 30 frames per second on a 25 MHz Motorola 68040 CPU. It allowed any QuickTime movie to be a fully interactive and programmable container for media.
But it suffered numerous bugs, including a buffer overrun, which is more problematic to most users. Otherwise, users will have to install QuickTime 7 from the "Optional Installs" directory of the Snow Leopard DVD after installing the OS.
The ability to contain abstract data references for the media data, and the separation of the media data from the media offsets and the track edit lists means that QuickTime is particularly suited for editing, as it is capable of importing and editing in place (without data copying). Some of these effects would even respond to mouse clicks by the user, as part of the new movie interaction support (known as wired movies). A special track type was added that contained an interpreter for a custom programming language based on 68000 assembly language. This supported a comprehensive user interaction model for mouse and keyboard event handling based in part on the AML language from the Apple Media Tool. QuickTime X does not implement all of the functionality of the previous QuickTime as well as some[which?] of the codecs. When QuickTime X attempts to operate with a 32-bit codec or perform an operation not supported by QuickTime X, it will start a 32-bit helper process to perform the requested operation.

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