no speed difference with "fast"and "normal" recompress

[cordraconis]

After some thinking, I decided that the forum for VDub would be a good place to start with my problem.

(This is a part from my other post in the DivX 5 Forum, ...)

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I "discovered", something;
By using DVD2AVI-->GKnot-->AVIsynth-->Virtualdub, and with "colorspace = YUV" in DVD2AVI, and then using "Fast recompress" in VDub, there is no difference in FPS, compared to "Normal recompress".

I have yet to test the difference with the "RGB" enabled in DVD2AVI, but why is there no difference in speed ??? (If you open a divX and try the same thing in VDub, it is about 30% faster.)

(Will post this in the VDub-section of the forum. If problem is related to DVD2AVI or Avisynth, please redirect me ...)

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thanks for your help ...

I use win XP, Athlon XP 1.9+, 256 DDR ram, Asus A7n266, ...

[madoka]

Does the AviSynth script generated by GordianKnot uses any VirtualDub filters? If so, that will cause a colorspace conversion.

[cordraconis]

I checked the file for "Avisynth-native" filters (like temporal smoothers and stuff), but I found no filters whatsoever, (except for the Cropping, which can do no harm.).

I found no other filters, so probably no Virtualdub filters either.

I read somewhere, that you can "force" DVD2AVI or Avisynth to use YUV colorspace, even if they should do that by default.

I think the line was something like this;

ConvertToYUY2()

Would that do any difference? (guess not, however, if the colorspace was already YUV, then how could I see the movie playing in the Preview-window? So somehow it must have been converted to RGB.)

Am I wrong here???