[FFmpeg-user] Decombing via screening

Paul B Mahol onemda at gmail.com
Tue Apr 14 13:05:32 EEST 2020

On 4/14/20, Mark Filipak <markfilipak.windows+ffmpeg at gmail.com> wrote:
> On 04/14/2020 05:26 AM, Paul B Mahol wrote:
>> On 4/14/20, Mark Filipak <markfilipak.windows+ffmpeg at gmail.com> wrote:
>>> 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.
>> I think you can double lines with separatefields,scale combination.
>> You just need to set right size args to scale filter and use nearest
>> neigbour interpolation
>> for doubling lines.
>> I still think that what you do is wrong thing to do.
> To which do you refer? 5-5-5-5 telecine (which is the overall architecture)
> or screening combed
> frames (which is the final step)? Actually, what I already have running is
> better than what MPV
> and/or my TV produces; better than p24->p60 and better than 4-6-4-6 telecine
> (and much better than
> 2-3-2-3 telecine frame doubled to 60fps of course).
>> Why? mpv player already have various interpolation algorithms for
>> X->60 progressive upsampling.
> What about people who don't use MPV? What about PowerDVD?
>> Note that they are not motion ones, as that one is very fragile and slow.
> What do you have in mind, Paul? I don't care about slow. I have a very
> large, very fast system and
> can mount many vdisks that I can run overnight while I sleep. However, I'm
> not too keen on "fragile"
> but maybe I can noodle out a solution to fragile when I see it. After all,
> I'll have you to help me. :-)


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