Add FFMPEG_ prefix to all multiple inclusion guards.
Originally committed as revision 10765 to svn://svn.ffmpeg.org/ffmpeg/trunk
Change license headers to say 'FFmpeg' instead of 'this program/this library'and fix GPL/LGPL version mismatches.
Originally committed as revision 6577 to svn://svn.ffmpeg.org/ffmpeg/trunk
Add official LGPL license headers to the files that were missing them.
Originally committed as revision 6219 to svn://svn.ffmpeg.org/ffmpeg/trunk
libavutil: Utility code from libavcodec moved to a separate library.
Originally committed as revision 4489 to svn://svn.ffmpeg.org/ffmpeg/trunk