Feature Implementation: mod2 crop function

[nobananasforyou]

G'day! Currently in avs+ cropping is limited to mod4 whereas in vs mod2 cropping is permitted. Is it possible to get this feature implemented in avs+?

Kind Regards!

[pinterf]

It should work. Post your use case.

[nobananasforyou]

Crop(left=7, top=0, right=5, bottom=0) That's how I do it in vs.

Avs+ doesn't allow odd crop values. Crop(7, 0, -7, -0)

[pinterf]

http://avisynth.nl/index.php/Crop Use width and height. With this syntax you are cropping an 1x1 rectangle, which probably works for yuv444 but does not work for any other subsampled format.

[nobananasforyou]

Yeah, but in vs it's not limited to specific formats.

[pinterf]

No. You cannot make an 1x1 sized clip in yuv420 format. Maybe vs rounds up.

[nobananasforyou]

You're right. My testing material is gray10/16. However, that also doesn't work with avs+.

[pinterf]

For a workaround, you can use resizers for cropping, src_left,top,width,height follow the crop syntax. Spline64Resize(width-2*7,height,src_left=7, src_top=0, src_width=-7, src_height=0)

For grey (Y8..Y32), Crop should work, note that GreyScale() and ConvertToY() is different, former leaves the clip in whatever source format (e.g. YV12), just neutralizing chroma.

[pinterf]

http://avisynth.nl/index.php/Crop Use width and height. With this syntax you are cropping an 1x1 rectangle, which probably works for yuv444 but does not work for any other subsampled format. And my reasoning was wrong, of course, -7 and 0 does not yield 1x1 pixels they result in right side and bottom-relative calculation.

[nobananasforyou]

Alright, thanks.