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GPAC Project on Advanced Content (GPAC, a recursive acronym) is an implementation of the MPEG-4 Systems standard written in ANSI C. GPAC provides tools for media playback, vector graphics and 3D rendering, MPEG-4 authoring and distribution. GPAC provides three sets of tools based on a core library called libgpac: * A multimedia player, cross-platform command-line based ''MP4Client'' or with a GUI ''Osmo4'' * A multimedia packager, ''MP4Box'' * Some server tools, around multiplexing and streaming (under development) GPAC is cross-platform. It is written in (almost 100% ANSI) C for portability reasons, attempting to keep the memory footprint as low as possible. It is currently running under Windows, Linux, Solaris, Windows CE (SmartPhone, PocketPC 2002/2003), iOS, Android, Embedded Linux (familiar 8, GPE) and recent Symbian OS systems. The project is intended for a wide audience ranging from end-users or content creators with development skills who want to experiment the new standards for interactive technologies or want to convert files for mobile devices, to developers who need players and/or server for multimedia streaming applications. The GPAC framework is being developed at École nationale supérieure des télécommunications (ENST) as part of research work on digital media. == GPAC and standards == GPAC has roots in a New York city startup 1999. As an open-source project GPAC officially started in 2003 with the initial goal to develop from scratch, in ANSI C, clean software compliant to the MPEG-4 Systems standard, a small and flexible alternative to the MPEG-4 reference software.〔 It is actually licensed under LGPL. In parallel, the project has evolved and now supports many other multimedia standards, with some good support for X3D, W3C SVG Tiny 1.2, and OMA/3GPP/ISMA and MPEG Dynamic Adaptive Streaming over HTTP (MPEG-DASH) features. 3D support is available on embedded platforms through OpenGL-ES. The MPEG-DASH feature can be used to reconstruct .mp4 files from (e.g., YouTube) videos streamed and cached in this format. Various research projects used or use GPAC. Since 2013 ''GPAC Licensing'' offers business support and (closed source) licenses. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「GPAC Project on Advanced Content」の詳細全文を読む スポンサード リンク
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