8x8 vs. 4x4 Transform Adaptivity question

[anrque]

I'm messing with some settings in MainConcept's h.264 encoder. I have v2 that uses the Elecard codec. Does anyone know which settings under advanced mess with the "8x8 vs. 4x4 Transform Adaptivity" feature that is described in the h.264 wiki online? The PDF help document doesn't seem to describe this. Is it the setting for Hadamard Transform?
Thanks.

[Dark Shikari]

I'm messing with some settings in MainConcept's h.264 encoder. I have v2 that uses the Elecard codec. Does anyone know which settings under advanced mess with the "8x8 vs. 4x4 Transform Adaptivity" feature that is described in the h.264 wiki online? The PDF help document doesn't seem to describe this. Is it the setting for Hadamard Transform?
Thanks.This controls what DCT size is used; the Hadamard transform is only used in coding i16x16 blocks (and additionally as a metric in subpixel motion searching).

i8x8 blocks use 8x8DCT, i4x4 uses 4x4DCT, i16x16 uses 4x4DCT and an additional 4x4 Hadamard transform for the DC coefficients.

p16x16, p8x16, p16x8, and p8x8 blocks can all choose between 4x4 and 8x8 DCT. p8x4, p4x8, and p4x4 must choose 4x4 DCT, since they're too small for an 8x8.

[anrque]

So if I understand correctly, this is a setting that is applied automatically based on the implementation of the standard. Not something that I turn on and off as a feature of encoding?

[Dark Shikari]

So if I understand correctly, this is a setting that is applied automatically based on the implementation of the standard. Not something that I turn on and off as a feature of encoding?Its both--8x8dct is High Profile only, and you can turn it on and off.

[anrque]

So in the Mainconcept/Elecard codec is the feature described by one of these controls below?
Under "search shape" my choices are 8x8 and 16x16. "Subpixel mode" is Full, Half and Quarter and the other settings are Fast or Complex.
Sorry to beat this into the ground; I'm just trying to understand.
http://img443.imageshack.us/img443/2121/advancedvideosettingsry1.gif

[Dark Shikari]

So in the Mainconcept/Elecard codec is the feature described by one of these controls below?
Under "search shape" my choices are 8x8 and 16x16. "Subpixel mode" is Full, Half and Quarter and the other settings are Fast or Complex.
Sorry to beat this into the ground; I'm just trying to understand.
http://img443.imageshack.us/img443/2121/advancedvideosettingsry1.gifIn Mainconcept, Profile decides whether 8x8dct is used or not. Search Shape relates to motion searching, and the rest relate to the precision of motion searching and partition decision.