Comparing Beta 2 vs beta 1 (latest celtic version)

[pwh04]

Just for comparison sake in case anyone uses similar settings. Keopis latest 1.1.0-beta 2 came out about 50 mb larger than celtic druid's XviD-1.1.0-beta1-ICL8.1.exe and took about 15 min longer to finish.

approx 2 hr movie:
One Pass
resolution 576 / 16 x 16
field deinterlace
sharp bicubic resize
no other filters in avisynth
2-3, 2-3, 2-3 quants
trellis
1350 target brate (celtics came out just above the target)
hvsbetter matrix
cartoon mode (helps compression)
no packed bitstream
no qpel
no gmc
no aq
bvops default
no vhq for bframes
vhqmode - 2

I didn't see a difference in quality - both very nice. Depending on source, sometimes will use bilinear resizer (softer) to help compression - but for this title it came out close enough to my target.

[Sharktooth]

Use DEFAULTS!
Your codec settings are ... uhm... (expecially the "2-3, 2-3, 2-3 quants" thing!).

[Koepi]

You shouldn't use 1pass/bitrate, the algorithm is not really optimal. XviD is heavily optimized for 2pass scenarios.

The faster speed is based on two factors: some speedups in the code between beta1 and beta2 (unfortunately have been eaten up by the correction of the rate-distortion algorithm/-table correction) - and maybe you have a pIV and not an AMD box?

Cheers
Koepi

[Yong]

According to XviD 1.1.0-beta2 change log:
"Improved Low bitrate quality"

I've tested some difficult source, compare to 1.0.3 and 1.1.0 beta1,
some wierd visual artifact were gone in 1.1.0-beta2.
It is true:)
Keep the good work! XviD devs:)

[pwh04]

Originally posted by Koepi
You shouldn't use 1pass/bitrate, the algorithm is not really optimal. XviD is heavily optimized for 2pass scenarios.

The faster speed is based on two factors: some speedups in the code between beta1 and beta2 (unfortunately have been eaten up by the correction of the rate-distortion algorithm/-table correction) - and maybe you have a pIV and not an AMD box?

Cheers
Koepi

Yes I do have a Pentium 4 - Thx for the info nice explanation :D

Re: "use defaults" above, thru my many many hrs of testing, these settings work best for what I'm after (speed and quality of one pass - not after exact file size, capping quants, excellent compression custom matrix with still nice quality, and use just enough filtering to get close to my target bitrate). This is what I love about XviD!! I can't thank the Devs enough for such a nice open source codec.