Compresibility test???

[Masterfreezer]

Can someone tell how must i use comp test??
I have read all documentation about Gknot and i can't find anything about it. How much time does it takes? What advantages??

Thx

[manono]

Hi-

From Doom9's GKnot Guide (http://www.doom9.org/gknot-divx3.htm):

60% or higher will pretty much guarantee that you'll get pretty good looking results. Going over 80% is a serious overkill and you should rather increase the resolution. Values in the range of 50-60% still look pretty good and 40-50 is reaching critical levels. The darker a movie gets and the cleaner the source the more you can compress a movie. Once the value is in the acceptable range set the trim option to Both (enc. credits separately).
It helps determine the proper resolution for a given audio and file size. It'll take 5-15 minutes depending on CPU speed.

From the GKnot Help Tab:

- Compressibility Check:-

this is great. you can now do a very short 'first pass' to find out the bits/(pixel*frame)-value for
resizing.
when saving the .avs, in 'Compressibility Check' check 'Use 5%'. this will give you a short clip on
which you
do a regular nandub first-pass.
10 minutes later...
when the little stats-file is finished press 'load' in the bits/(pixel*frame)-box at the bottom to open
it.
now resize according to the guide, save a final avs and start the first pass.
it's important to 'load' the file and not to open it in the stats-editor (-> wrong results).
I have read all documentation about Gknot

You may have read some of the documentation, but by no means all.

[Masterfreezer]

Thank you very much.

[ohliuv]

is there a way to do the test with divx5, without using the 'now' button?
I want to test for example some c3d settings, but sre(280,14) alone didn't work. What am I missing? Quants? Bitrate?

[jggimi]

Yes, you can do your own tests. [list=1]
From the "Save&Encode" window, turn on the test
Don't press "now". Press "edit" and make any non-Gknot changes to your .avs you want. Or, pres "save" and edit outside of Gknot.
Open .avs in Virtual Dub
Set Video to Fast Recompress.
Set Compression to DivX 5...and press the "Configure" button
Set to first pass of 2 passes.
>>> Very important: set your log file name to <name>_AAAxBBB.log, using the resolution you chose in Gknot.
Set any DivX 5 parameters you want.
Press "OK" twice.
Save as AVI...
Go back to Gknot, press LOAD button, use the .log file from this first pass as input.
[/list=1]

[ohliuv]

lol :D, the file name matters? thanks, will check it with my next encoding :)

[ohliuv]

nope, doesn't work :( Is the comp-check done with quant 2 ?

[jggimi]

No, it is the first pass of a 2-pass encoding ... without a 2-pass encoding, there can be no log file. (See step 6, above.)