Improved 2pass bitrate predictor. No real change most of the time, but allows correct ratecontrol on some pathological videos that used to diverge completely. Also improves prediction when 2nd pass bitrate is very different from 1st pass.
The new qscale2bits() has no simple inverse, so I also had to change rc_eq to output qscale instead of bits.


git-svn-id: svn://svn.videolan.org/x264/trunk@129 df754926-b1dd-0310-bc7b-ec298dee348c

git-svn-id: svn://svn.videolan.org/x264/trunk@127 df754926-b1dd-0310-bc7b-ec298dee348c

Now enforces min and max GOP sizes, and allows variable numbers of
non-IDR I-frames within a GOP.


git-svn-id: svn://svn.videolan.org/x264/trunk@93 df754926-b1dd-0310-bc7b-ec298dee348c

renumber direct_pred


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patch by Tuukka Toivonen <tuukkat at ee.oulu.fi>


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ensures that I-frames have comparable quantizer to the following P-frames,
and produces more consistent quality in areas of fluctuating complexity.


git-svn-id: svn://svn.videolan.org/x264/trunk@61 df754926-b1dd-0310-bc7b-ec298dee348c

 + Fixed Makefile for OS X

 (Original patch by Peter Handel)


git-svn-id: svn://svn.videolan.org/x264/trunk@55 df754926-b1dd-0310-bc7b-ec298dee348c

" 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

"Improved patch. Now supports subpel ME on all candidate MB types,
not just on the winner.

subpel_refine: (completely different scale from before)
0 => halfpel only
1 => 1 iteration of qpel on the winner (same as x264 r46)
2 => 2 iterations of qpel (about the same as my earlier patch, but faster
3 => halfpel on all MB types, qpel on the winner
4 => qpel on all
5 => more iterations

benchmarks:
mencoder dvd://1 -ovc x264 -x264encopts
qp_constant=19:fullinter:cabac:iframe=200:psnr

subpel_refine=1:  PSNR Global:46.82 kb/s:1048.1 fps:17.335
subpel_refine=2:  PSNR Global:46.83 kb/s:1034.4 fps:16.970
subpel_refine=3:  PSNR Global:46.84 kb/s:1023.3 fps:14.770
subpel_refine=4:  PSNR Global:46.87 kb/s:1010.8 fps:11.598
subpel_refine=5:  PSNR Global:46.88 kb/s:1006.9 fps:10.824"

 And

"The current code for calculating the cost of encoding which reference
frame a MB is predicted from, introduces a bias towards ref0 and
against P16x16.
Removing this bias produces an improvement of .4% - 2% bitrate,
depending on content and number of reference frames."



git-svn-id: svn://svn.videolan.org/x264/trunk@47 df754926-b1dd-0310-bc7b-ec298dee348c

 "Mostly borrowed from libavcodec.
 There is not much theoretical basis behind my choice of defaults for
 rc_eq, qcompress, qblur, and ip_factor."
 


git-svn-id: svn://svn.videolan.org/x264/trunk@40 df754926-b1dd-0310-bc7b-ec298dee348c

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 but we should start using it :)


git-svn-id: svn://svn.videolan.org/x264/trunk@32 df754926-b1dd-0310-bc7b-ec298dee348c

Change frame rate from float to fraction (sorry for the inconvenience).


git-svn-id: svn://svn.videolan.org/x264/trunk@27 df754926-b1dd-0310-bc7b-ec298dee348c

"Here's a patch that adds some kind of rate control.  I suppose it is
 by no means perfect, but it's much better than constant quantizer.  It
 also has a very crude scene change detection that sometimes avoids a
 buffer underflow by reencoding oversized P/B frames as I frames."



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