Originally committed as revision 22778 to svn://svn.ffmpeg.org/ffmpeg/trunk

Patch by James Darnley <james darnley at gmail>.

Originally committed as revision 22605 to svn://svn.ffmpeg.org/ffmpeg/trunk

this seems to improve RD performance.

Originally committed as revision 22550 to svn://svn.ffmpeg.org/ffmpeg/trunk

This takes into account whether the granule defines the start or end times
of packets, and sets the correct file offset of the associated page.

Originally committed as revision 22462 to svn://svn.ffmpeg.org/ffmpeg/trunk

Otherwise it gets set automatically to a page midstream and prevents seeking
to the first page.

Originally committed as revision 22454 to svn://svn.ffmpeg.org/ffmpeg/trunk

Originally committed as revision 22453 to svn://svn.ffmpeg.org/ffmpeg/trunk

user.

Originally committed as revision 22352 to svn://svn.ffmpeg.org/ffmpeg/trunk

Seeking on image sequences doesn't actually work, so this
test isn't very useful until that capability is added.

Originally committed as revision 22286 to svn://svn.ffmpeg.org/ffmpeg/trunk

Originally committed as revision 22158 to svn://svn.ffmpeg.org/ffmpeg/trunk