[solved] Weaving different height fields (+-1px) in AviSynth?

[paprikajancsi]

Edit: Sorry, guess I didn't think it through...

I've got this interlaced PAL DVD source I want to encode. I want to get rid of the lowest line in the bottom field because of errors in that line. This would give me one 720x288 field and one 720x287 field. Are the different field heights going to be a problem when weaving? Here's the illustration:

Legend:

B-R = Bad line - remove
O-R = OK line - remove



	
	
		TOP  BOTTOM

		O			^
			O		|
					|
	.				
	.				576
	.				lines
					
			O		|
		O			|
			B-R		v
 
I've got another source, from which I'd like to remove the highest two lines from the top field, the highest line from the bottom field, and the lowest line from the bottom field. I know if have to switch field order before weaving. I'm new to AviSynth, so I'm still a bit confused about what commands and parameters to use (despite viewing the tutorials).


	
	
		TOP  BOTTOM

		B-R			^
			O-R		|
		B-R			|
			O		|
		O			
	.				576
	.				lines
	.				
					|
			O		|
		O			|
			B-R		v

[jagabo]

Just mask the bad areas -- Crop and AddBorders. Use at least mod4 when working with interlaced video. For example, in the second case:

Crop(0,-4,-0,-4).AddBorders(0,4,0,4)