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27th October 2007, 13:28 | #1 | Link |
Flying Skull
Join Date: Jan 2005
Posts: 397
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Correct order for deblocking with de-blended material
If I'm deblending a PAL DVD (which has been blended from NTSC) like this...
Code:
DGDecode_mpeg2source("Sympathy For Lady Vengeance.d2v",info=3) tdeint(mode=1, full=false, tryweave=true) changefps(23.976*10) selectevery(10,10) #selected by experiment crop(2,72,-2,-72) spline36resize(720,352) #denoise/deband/sharpen/whatever My best guess is just before the crop, where the video is deinterlaced/deblended but it still has the full set of PAL encoder blocks. But frankly, I'm reaching. So I'd love to hear from anybody who actually understands this stuff. |
27th October 2007, 14:37 | #2 | Link |
Registered User
Join Date: Apr 2002
Location: Germany
Posts: 5,389
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That's indeed a problem. You can put it in that place, but there is danger that the used Deblock() filter will miss some blocks. Why? Because:
Blocking will occur mostly when there is motion. When there is motion, the deinterlacer can't match fields, but will have to interpolate. When the deinterlacer interpolates, the top/bottom borders of a block are not "sharp" anymore. When the sharp boundaries of a block have been blurred, the deblocker is more likely to not reckognize the block as being blocky, thus not processing it. Try this way: deblocking the "point-bobbed" interlaced stream before any other processing: Code:
i=last AssumeBFF().SeparateFields() PointResize(i.width,i.height) Deblock_qed() AssumeFrameBased().AssumeBFF() Separatefields().Selectevery(4,0,3).Weave() and see if it makes a difference compaired to the more simple method (deblocking after the deinterlacing).
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