Twice bigger row_sizeY - Logo filter

[Walda]

I am trying to write very, very simple Logo filter for Avisynth 2,5 to avoid converting to RGB and back.
I have prepared some "skeleton" for this, but I must pass twice bigger values in X -
I have found that "const int row_sizeY = dst->GetRowSize(PLANAR_Y);" return twice bigger values - thats for example 1440 for video 720x576. Why? Would anybody help me?
Thanks

Walda

[sh0dan]

Your video is most likely YUY2. Use vi.IsYUY2() to find out.

[Walda]

Thanks for Your answer, You're right, it's YUY2 and I should test it before posting ( You write about that on Your pages).
But I am confused - its video captured by Digital8 camcorder - DV format is 4:2:0, so it is 12 bits? Yes, there are YUY2 16 bit with only "duplicated" second line of chroma, but the number of Y samples might be the same?
On the other hand the "sceleton" for the filter is working except what i have written above. But just now I have no idea how to treat and compare normal bmp with double x-sized video ?

Walda

[sh0dan]

It all depends on what your DV-codec wants to return, so I guess it only wants to return YUY2 data. Exchanging it for another might solve the problem - but maybe they behave the same.