* all: Patch by Loren Merritt.

 * all: Patch by Loren Merritt.

" This patch makes scene-cut detection based on the relative cost of I-frame
vs P-frame, rather than just on the number of I-blocks used.
It also makes the scene-cut threshold configurable.

This doesn't have a very large effect: Most scene cuts are obvious to
either algorithm. But I think this way is better in some less clear cut
cases, and sometimes finds a better spot for an I-frame than just waiting
for the max I-frame interval."

git-svn-id: svn://svn.videolan.org/x264/trunk@49 df754926-b1dd-0310-bc7b-ec298dee348c