Log in

View Full Version : Min Quailty

ArcticIce
27th January 2002, 04:00
hi.. i have a question about the minq feature in ndub.. i was wondering how is this value used/measured.. i.e. i used 14db with
30%motion. how low does the bitrate have to be before the minq kicks in?
LotionBoy
27th January 2002, 07:52
go here
http://members.tripod.de/de_koepi/nandub_options_explained.html
read the section on Min quality and motion modulation. It explains it.

LotionBoy
ArcticIce
27th January 2002, 08:03
ive read it before..it doesnt really explain its how the minquailty is meassured and applied with minbit to prevent low bitrate frame
LotionBoy
27th January 2002, 18:58
min quality has nothing to do with min bitrate. Min quality deals with the quality of the frame. So if the PSNR is off, min quality causes the frame to be reencoded at a better quality. Min Bitrate just prevents the bitrate from dropping below a certain level. They both affect quality, they do not work together.

LotionBoy
JimmyBarnes
2nd February 2002, 06:24
One thing Min qual does do is bloat your final AVI filesize. It also slows encoding.

Of course that's only a prob if you like to work to a set filesize, say 1 or 2 CDs.

Many experienced users report they set Min Qual to 0. Most movies look OK on this setting.

Min Qual was not a feature of the earlier NanDub versions.

JB
LotionBoy
2nd February 2002, 07:30
Agreed. Min Quality is not Necessary if you are making a 1 or 2 CD rip. Why? Because if you set your resolution right and set Nandub right, then you should not have a problem with quality and all min. quality will do is bloat your file. If you are a quality freak and don't care about size, then it can be useful, but not necessarily as PSNR is not a great measure of quality. However, Min Quality of 1 with an antishit of 16 seems to prevent bunches of keyframes in some cases, so I use it for that.


LotionBoy
kttiger
4th February 2002, 05:03
I like to have crisp pictures... Ummm... I have been setting Antishit = 16 Min Qual = 27 Modulation = 25%.

If I set min Qual = 0 does that mean Antishit has to be zero to get GOOD CRISP picture?
ArcticIce
4th February 2002, 06:01
if you want crisp pictures.. try to sharpen it up or using the crispness modulation