[Ffmpeg-cvslog] r6876 - trunk/libavcodec/motion_est.c

[Guillaume POIRIER]

Hi,

On 12/12/06, Michael Niedermayer <michaelni at gmx.at> wrote:
> On Mon, Dec 11, 2006 at 02:07:23PM -0800, Corey Hickey wrote:
> > michael wrote:
> > >Author: michael
> > >Date: Fri Nov  3 00:36:39 2006
> > >New Revision: 6876
> > >
> > >Modified:
> > >   trunk/libavcodec/motion_est.c
> > >
> > >Log:
> > >new I/P frame selection heuristic
> > >PSNR/bitrate is slightly better for my (short) test videos
> > >more tests welcome ...
> > >
> > >
> > >Modified: trunk/libavcodec/motion_est.c
> > >==============================================================================
> > >--- trunk/libavcodec/motion_est.c    (original)
> > >+++ trunk/libavcodec/motion_est.c    Fri Nov  3 00:36:39 2006
> > >@@ -1178,13 +1178,11 @@
> > >         vard= check_input_motion(s, mb_x, mb_y, 1);
> > >
> > >         if((vard+128)>>8 < c->avctx->me_threshold){
> > >+            int p_score= FFMIN(vard,
> > >varc-500+(s->lambda2>>FF_LAMBDA_SHIFT)*100);
> > >+            int i_score= varc-500+(s->lambda2>>FF_LAMBDA_SHIFT)*20;
> >
> > Could you please give me a really quick explanation of what information
> > is stored in vard and varc? I see where they are assigned but I don't
> > understand the rest of the code well enough to figure it out from context.
>
> vard is sum of squared differences with the estimated motion vector
> varc is the variance of the block (sum of squared (p[y][x]-average))

Great, doxyfied ;-)

Guillaume
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