(Loren Merrit <lorenm at u dot washington dot edu>)


git-svn-id: svn://svn.videolan.org/x264/trunk@53 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

 (only the header/textures bits computed for now).


git-svn-id: svn://svn.videolan.org/x264/trunk@39 df754926-b1dd-0310-bc7b-ec298dee348c

git-svn-id: svn://svn.videolan.org/x264/trunk@36 df754926-b1dd-0310-bc7b-ec298dee348c

git-svn-id: svn://svn.videolan.org/x264/trunk@35 df754926-b1dd-0310-bc7b-ec298dee348c

git-svn-id: svn://svn.videolan.org/x264/trunk@34 df754926-b1dd-0310-bc7b-ec298dee348c

Merritt <lorenm AT u DOT washington DOT edu>


git-svn-id: svn://svn.videolan.org/x264/trunk@33 df754926-b1dd-0310-bc7b-ec298dee348c

 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

 (Not 0..65534)


git-svn-id: svn://svn.videolan.org/x264/trunk@23 df754926-b1dd-0310-bc7b-ec298dee348c

size anymore, so need more testing).


git-svn-id: svn://svn.videolan.org/x264/trunk@20 df754926-b1dd-0310-bc7b-ec298dee348c

Merritt <lorenmn AT u DOT washington DOT edu>
 Using SQE(DeltaSourceReconstructed) = Sum( delta^2 )
       PSNR( SQE, Size ) = -10Ln(SQE / 255^2 / Size )/Ln(10) )
       Y+U+V : Union of YUV planes.

 Now there is 
  - Mean PSNR : Sum( PSNR( SQE(Y/U/V), Size(Y/U/V) ) / TotalFrames
  - Average PSNR: Sum( PSNR( SQE(Y+U+V), Size(Y+U+V) ) ) / TotalFrames
  - Global PSNR: PSNR( Sum( SQE(Y+U+V) ), Size(Y+U+V)*TotalFrames )

  Mean PSNR is used by the JM, and Average/Overall is used on Doom9 for
example.



git-svn-id: svn://svn.videolan.org/x264/trunk@19 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."



git-svn-id: svn://svn.videolan.org/x264/trunk@17 df754926-b1dd-0310-bc7b-ec298dee348c

git-svn-id: svn://svn.videolan.org/x264/trunk@15 df754926-b1dd-0310-bc7b-ec298dee348c

 (Buggy for pskip and mb with null cbp luma and chroma).
 * dct*: fixed order of idct.


git-svn-id: svn://svn.videolan.org/x264/trunk@13 df754926-b1dd-0310-bc7b-ec298dee348c

git-svn-id: svn://svn.videolan.org/x264/trunk@1 df754926-b1dd-0310-bc7b-ec298dee348c