[FFmpeg-user] Decombing via screening

Paul B Mahol onemda at gmail.com
Tue Apr 14 11:23:24 EEST 2020

On 4/14/20, Mark Filipak <markfilipak.windows+ffmpeg at gmail.com> wrote:
> How do I combine two combed half-pictures so that the resulting picture is
> screened?
> Combed input frame:
> 11111...
> 22222...
> Desired output frame:
> 12121...
> 21212...
> It occurs to me that I need to unweave the half-pictures, line-double both,
> screen both via
> pixel-sized screens that are offset by 1 pix, then reweave them.

Look at weave, doubleweave, separatefields and so on....

> I've not found a line-doubling filter and I've not found a screen method
> that actually works.
> Also, a method to zoom pixels in the output so I can actually see them
> individually without a
> magnifying glass would be very helpful.

datascope or pixscope filter.

> I've tried every filter I could find that has anything to do with blending,
> screening, blurring,
> etc., but I may have missed something.

You are just a big troll.

> A really ambitious method would be: Replace the combed frame with a
> synthesized frame that's a
> motion-vector meld of the preceding and subsequent progressive frames, but
> that seems pretty wild
> and probably beyond ffmpeg's capabilities, but I simply don't know.
> Thanks,
> Mark.
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