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A scene description is a language describing animations, interactivity, 2D and 3D shapes, audio and video relationship in a presentation.
GPAC supports a variety of scene description languages:
MPEG-4 BIFS, in its binary form, text form and XML form
Web3D VRML97 and X3D
SVG 1.2 Tiny profile
A subset of SWF (Adobe Flash)
MP4Box supports encoding of BIFS and LASeR, as well as various conversions operations. A detailed list of supported operations is provided here.
Rendering is supported in GPAC through the Compositor filter.
For MPEG-4 Systems scene coding and media packaging, GPAC relies on standard MPEG-4 descriptions but defines its own extensions for media multiplexing, as well as for some BIFS commands. You may also have a look at the tips and tricks page.