Differences in comptest between Auto GK and Gordian Knot

[xistan]

Hi,

Question regarding Auto GK 1.86b and GK 0.34.4.

I'm a bit confused regarding the comptest. I have a PAL DVD Source which I run through both Auto GK and Gordian Knot. I'm using Xvid (1.0.3) and I set the desired file size to 1/4th DVD-R and decide to keep my AC3-Audio and set the width to 704. I do this in both apps. Then I start Auto GK. The compressibility test from Auto GK reports 77 % quality and goes on to first pass encoding.

When I do the same thing in Gordian Knot by opening the d2v-file from AutoGK and setting bitrate and resolution according to the AutoGK settings and then perform a comptest, I get 47% quality.

Any ideas about what might be causing this? I do not have my log-files available but I can create them again later if needed. I'm more interested really in what might be the reason to this major difference in quality estimation. Which one can I trust?

By the way, Thanks for a great forum and a very fun application!

/C

[len0x]

what about audio settings?

Despite the fact that GK and AutoGK use slightly different methods for comp test, the difference even in extreme cases should not be more than 15%.

[xistan]

I keep the audio in original AC-3 format. Also chosing the corresponding settings in GK.

Does audio settings have any impact on compressibility test?

The resulting movie after encoding is finished reaches the desired size in both Auto GK and Gordian Knot and it appears to have about the same visual quality too (as expected from file size). I'm just confused why comptest results can differ that much.

One thing that came to mind. Is the d2v-file format compatible in both cases? I use the same d2v file (generated by AutoGK 1.89).

This is perhaps not a big issue, but a bit worrying if a presumably 75 % quality encoding in one application just reaches barely 50% in another application.

I'll invesigate a bit further. Perhaps I don't use the same XviD settings...

/C