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View Full Version : How to achieve Symetric Curve Compression.


Dali Lama
2nd March 2002, 18:37
I believe to achieve symetric curve compression using Kopei's builds, one would simply have the low/high % fields equal each other, like 25%.

However, does this simply flaten the curve from the second pass stats?

If so, that is what I am aiming to do. For some reason I find setting the high/low compression % values equal achieves better results (at least in anime).

Ok bye,

Dali

Koepi
2nd March 2002, 19:00
Your logical assumption is correct.

Setting low%/high% to the same value results in symmetrical curve compression.

Regards,
Koepi

Ripe73
2nd March 2002, 19:05
I have used High:20% and Low:0% and hopefully give more bitrate to lowmotionscenes and take bitrate from big frames(actionframes).I hope that will give nice result:)

EDIT:Right now i drink a "Falcon extra brew" maybe a better name"Falcon extra smooth"

Koepi
2nd March 2002, 19:09
Hm. I don't want to repeat myself, just read my last mail in this thread ;)

Regards,
Koepi

R3g
3rd March 2002, 18:45
Hmmm.. I thought setting low comp at 0% would lower the bitrate in low motion scenes... I think I should read Koepi's doc ones more. I'm relatively new to XviD, and my old Nandub-fashioned thinkings are still there.

kermit70
4th March 2002, 00:19
I'm a bit confused. As I understand it, when I use, say 25%/25% for curve compression, the codec takes 25% from the high motion scenes and boosts the low motion scenes by the same amount (symetrical). But if I use 25%/0%, is there a difference? Does the codec still give the 25% to the low motion scenes, or are they simply discarded (resulting in a smaller file size)?

Just curious,

kermit70