Using same avs, Gordian Knot produces a different XviD to VirtualDubMod

[Skywalkerjen]

Hello

I created an avs in Gordian Knot 0.32 beta with resizing (Lanczos), cropping, and deinterlacing (field deinterlace). Using the same settings for XviD 1.0.2 in both cases (single pass quant = 2), I encoded the avs with Gordian Knot and then again with just VirtualDubMod.

I got two different XviDs at the end.

The Gordian Knot properties (according to WindowsXP) were:
File size: 39.5MB, Datarate: 712kbps, Video Sample Size: 12bit

The VirtualDubMod XviD properties (according to WindowsXP) were:
File size: 39.8MB, Datarate: 716kbps, Video Sample Size: 24bit

The avs script (Only lines without # are included):

# PLUGINS
LoadPlugin("C:\PROGRA~1\GORDIA~1\AviSynthPlugins\dgdecode.dll")
LoadPlugin("C:\PROGRA~1\GORDIA~1\AviSynthPlugins\decomb.dll")
LoadPlugin("C:\PROGRA~1\GORDIA~1\AviSynthPlugins\UnDot.dll")

# CROPPING
crop(292,2,418,570)

# DEINTERLACING (1)
FieldDeinterlace()

# RESIZING
LanczosResize(768,960)

# DENOISING: choose one combination (or none)
Undot()

Questions:
1. Is LanczosResize not a plugin that must be loaded?
2. Is FieldDeinterlace not a plugin that must be loaded?
3. I chose no Denoising, is undot plugin loaded here? Is it necessary?
4. Is there a quality gain when using VirtualDubMod only over Gordian Knot for XviD?

Thanks for your patience
Skywalkerjen:cool:

[sysKin]

Originally posted by Skywalkerjen
Video Sample Size: 12bit
(...)
Video Sample Size: 24bit

Doesn't it explain everything? 12 bit means it was Fast Recompress and 24 bits means it was Full Processing. And since Full Processing involves lossy colourspace transformations you've got a different file.

Nothing unexpected happened.

[Skywalkerjen]

Many thanks Syskin

I thought windows might be reporting incorrect information as I assumed 24bit sample size would give a much larger filesize than 12bit.

I didn't realise Gordian Knot used fast recompress. I shall now go and search for this.
Many thanks for putting me on track.

Skywalkerjen