[FFmpeg-user] Decombing via screening

Mark Filipak markfilipak.windows+ffmpeg at gmail.com
Tue Apr 14 11:59:57 EEST 2020

On 04/14/2020 04:23 AM, Paul B Mahol wrote:
> 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....

Thanks. I'll run them through my tester.

>> I've not found a line-doubling filter and I've not found a screen method
>> that actually works.

Actually, after I posted, I thought of bob. I think bob line doubles.
>> 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.

Thanks again.

>> 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.

Yup! That's me! Mark, the ffmpeg troll. The troll of your dreams. Just keep your hands to yourself, 

>> 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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