Log Message:
Import gpac version 0.4.5.

GPAC features encoders and multiplexers, publishing and content distribution
tools for MP4 and 3GPP or 3GPP2 files and many tools for scene descriptions
(BIFS/VRML/X3D converters, SWF/BIFS, SVG/BIFS, etc...). MP4Box provides all
these tools in a single command-line application.