I have a VHS DV capture I'm saving as Huffyuv, then cleaning with NeatVideo and converting to DVD mpeg.
How would you crop the switching noise off the bottom to ensure the spatial relationship of the interlacing is maintained, the original proportion of the video is maintained and not introduce any artifacts?
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You could just cover it with black using a Letterbox command. For example:
Letterbox(0,12)
Otherwise bob, crop, resize, reinterlace.
If there's stuff below the garbage lines worth saving, you could try jagabo's InterpolateScanLines function.
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Make sure to crop with an even number to preserve the field order. Then restore the original dimensions using AddBorders, be sure not to resize the interlaced videos. Again, AddBorders should not contain any odd numbers.
Crop(x,x,x,x)
AddBorders(x,x,x,x) -
For interlaced YV12 video you should crop/addborders mod4 on the vertical axis or you'll get blurring of the chroma.
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As jagabo sys, with YV12 interlaced video you have to crop as mod-4 on the vertical axis, mod2 on the horizonatl axis. Again, as several times in the past, refer to the online Help for Avisynth's Crop() function, or go to the bottom of this web page for a table of values: http://avisynth.nl/index.php/Crop .
Example: you have YV12 interlaced video with 8 pixels of head switching noise across the bottom. Cropping with mod4 valus, you can crop off 8 pixels and then add border pixels ( 4 at top, 4 at bottom) to center the image vertically:
Code:Crop(0,0,0,-8).AddBorders(0,4,0,4)
Code:Crop(0,0,-10,-8).AddBorders(6,4,4,4)
Last edited by sanlyn; 19th Mar 2014 at 10:08.
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Add the letterboxing to the top and bottom evenly, don't just replace the bottom with a black bar on the bottom.
If you want to see what I've done with my videos,
check out my video work on youtube, http://www.youtube.com/user/duhmez/ -
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If you want to see what I've done with my videos,
check out my video work on youtube, http://www.youtube.com/user/duhmez/ -
I've experimented with borders of different widths/heights in order to see how much difference it makes, and in respect to compressibility it's too little to think about. I've read threads where people have asked about the picture being blurred a little at the edges (just a couple of rows of pixels) when borders are used, which I'd assume would be a mod8, or maybe even a mod16 thing. I rarely use borders so I haven't really noticed it happening myself.
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