[Ffmpeg-cvslog] CVS: ffmpeg/libavcodec ratecontrol.c, 1.50, 1.51 mpegvideo.c, 1.494, 1.495 mpegvideo.h, 1.227, 1.228

[Corey Hickey]

Michael Niedermayer CVS wrote:
> Update of /cvsroot/ffmpeg/ffmpeg/libavcodec
> In directory mail:/var2/tmp/cvs-serv5393
> 
> Modified Files:
> 	ratecontrol.c mpegvideo.c mpegvideo.h 
> Log Message:
> use correct qp & lambda for ME on the second pass

Now that I'm done fixing my car... :)
...I'm finally getting around to testing Michael's recent improvements.
More updates from me will come over the next few days.

-----------------------------------------------------------------
for i in 1:turbo 2 ; do
  time mencoder ~/dumpstream/matrix.vob -aid 128 -oac copy \
  -vf crop=718:356:0:60,scale=640:272 -sws 9 -ovc lavc -lavcopts \
vcodec=mpeg4:vbitrate=581:psnr:vpass=$i:mbd=2:mv0:trell:cbp:\
precmp=2:cmp=2:subcmp=2:predia=2:dia=2:preme=2:vme=5:v4mv:\
last_pred=2:vqcomp=0.6:vmax_b_frames=2:qpel -ofps 24000/1001 \
  -o test.avi
done

-----------------------------------------------------------------
before:

(pass 1)
PSNR: Y:40.03, Cb:44.35, Cr:44.66, All:41.08
user    34m12.485s

(pass 2)
PSNR: Y:42.10, Cb:45.16, Cr:45.86, All:42.96
user    188m44.869s

-----------------------------------------------------------------
after:

(pass 1)
PSNR: Y:40.03, Cb:44.35, Cr:44.66, All:41.08
user    34m38.232s

(pass 2)
PSNR: Y:42.11, Cb:45.17, Cr:45.86, All:42.98
user    188m52.138s

-----------------------------------------------------------------
The differences in encoding time are negligible -- I'm using this
machine for random other stuff meanwhile, so the margin of error is
probably a few minutes large.

In accordance with what Michael wrote, there isn't a significant quality
improvement. Though the "before" and "after" encodes are visibly
different in high motion scenes, I can't really say which is better.

-Corey