[MEncoder-users] new doom9 codec comparission (submission)

[Dominik 'Rathann' Mierzejewski]

On Thursday, 15 December 2005 at 11:00, Rich Felker wrote:
[...]
> Just a few hours ago Dominik was reencoding a h264 file he had to make
> it playable on his "slow" laptop. He tried both lavc and xvid and got
> vastly superior results with lavc (2.32 avg quant versus 2.82 -- avg
> quant is generally not a good metric of quality, but with this much
> difference it probably is, and he reported the lavc file looked better
> too).

The visual difference isn't very visible, but it's there, for example
there's a scene with clouded sky and falling snow, which looks better
in lavc. Also, XviD looks a bit more "blurry" and shows more blocking
artifacts in scenes with fine colour gradients.

Here are the settings I used (pass 1 & 2)
for XviD (1.0.3):
-xvidencopts bitrate=900000:vhq=4:me_quality=6:max_key_interval=240:trellis:qpel:hq_ac:cartoon:max_bframes=0
and lavc (20051213):
-lavcopts vcodec=mpeg4:vbitrate=900000:vqcomp=0.6:keyint=240:v4mv:trell:mbd=2:mv0:qpel:cbp:preme=2:precmp=2:cmp=2:subcmp=2:predia=2:dia=2:last_pred=2

The results are:
xvid2pass $ countquant2.pl psnr_024726.log
q 2:   8472 (24.6%)
q 3:  23488 (68.3%)
q 4:   2444 ( 7.1%)

I:      413 ( 1.2%)  q: 2.91  psnr: 47.80
P:    33991 (98.8%)  q: 2.82  psnr: 46.61
B:        0 ( 0.0%)  q: 0.00  psnr:  0.00
All:  34404          q: 2.82  psnr: 46.62 (Y:45.82 Cb:48.60 Cr:49.22)

total size: 160569956 = 153.1 MiB = 895.21 kbps @ 23.976 fps

lavc2pass $ countquant2.pl psnr_013454.log
q 2:  24660 (71.7%)
q 3:   8780 (25.5%)
q 4:    797 ( 2.3%)
q 5:    152 ( 0.4%)
q 6:     15 ( 0.0%)

I:      503 ( 1.5%)  q: 2.39  psnr: 48.76
P:    33901 (98.5%)  q: 2.32  psnr: 46.98
B:        0 ( 0.0%)  q: 0.00  psnr:  0.00
All:  34404          q: 2.32  psnr: 47.00 (Y:46.30 Cb:48.59 Cr:49.19)

total size: 161370292 = 153.9 MiB = 899.67 kbps @ 23.976 fps

R.

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