[FFmpeg-user] Seeking smart decomb filter

[Paul B Mahol]

On Thu, Jan 21, 2021 at 12:51 PM Mark Filipak (ffmpeg) <markfilipak at bog.us>
wrote:

> On 01/20/2021 04:50 PM, Paul B Mahol wrote:
> > On Wed, Jan 20, 2021 at 10:45 PM Mark Filipak (ffmpeg) <
> markfilipak at bog.us>
> > wrote:
> >> On 01/20/2021 06:17 AM, Paul B Mahol wrote:
> >>> Motion compensation does not work that way.
> >>
> >> Thank you, Paul. Yes, I knew that. I'm not seeking motion compensation.
> >> Kindly reread my filter
> >> features and suggest what comes closest. What I seek simply works on
> >> pixels. I'm relying on your
> >> experience (and perhaps the experiences of others here).
> >
> > Have you tried nnedi or estdif filters? Both are intra only
> deinterlacers.
>
> Thank you for the guidance. I'm trying estdif first because it seems
> simpler, but it doesn't do the
> good thing. It does decomb very effectively, but it does it by aligning
> (shifting) the edges in
> field'2' to the edges in field'1' (which are not shifted). Aligning with
> field'1' produces judder
> (or in my case, doesn't eliminate judder). What I want it to do is align
> both field'1' edges and
> field'2' edges to the median (i.e. half way between the input's edges). I
> do realize that such a
> method would introduce combing along the edges of the frame, but that's
> okay.
>
> Here's the command I used to transcode 24FPS to 60FPS:
> ffmpeg -i 24[1][2].mkv -map 0 -filter_complex "telecine=pattern=5,
> split[1][2],
> [1]select=not(eq(mod(n\,5)\,2))[3], [2]select=eq(mod(n\,5)\,2),
> estdif=mode=frame[4],
> [3][4]interleave" -codec:v libx265 -x265-params "crf=16:qcomp=0.60"
> -codec:a copy -codec:s copy
> 24[1][2]-to-60[1][1][estdif=mode=frame(1~2)][2][2].mkv
>
> I'll try nnedi. Perhaps I can figure it out.
>

Do not even try.
Mentioned filters work only with interlaced frames, while your use case is
completely invalid and frowned upon.
I deeply regret replying to this thread.


>
> Thanks again,
> Mark.
>
> >> Regards,
> >> Mark.
> >>
> >>> On Wed, Jan 20, 2021 at 2:45 AM Mark Filipak (ffmpeg) <
> >> markfilipak at bog.us>
> >>> wrote:
> >>>
> >>>> Hello All,
> >>>>
> >>>> I seek a decomb filter that operates on H/2 number of line pairs:
> lines
> >> i
> >>>> & i+1 (where i=0..H/2-1),
> >>>> by aligning edges in the two lines at x = delta-x(edge)/2 (i.e. the
> >>>> median). The ideal filter would
> >>>> differentiate overall motion due to panning versus local motion due to
> >>>> local object motion.
> >>>>
> >>>> Pan-combing on the left & right edges is acceptable but it would be a
> >>>> great bonus if the filter
> >>>> performed blend on those edges with the blending radius equal to
> >> one-half
> >>>> the pan-comb.
> >>>>
> >>>> Vertical, line-pair-to-line-pair processing is not needed or desired.
> >>>>
> >>>> Frame-to-frame processing is not needed or desired.
> >>>>
> >>>> I have been trying a great number of filters based on their names and
> >> what
> >>>> is in the documentation.
> >>>> The best I've found so far is pp=linblenddeint but it obviously
> doesn't
> >>>> align edges via the edge
> >>>> median and it obviously isn't aware of pan-combing versus
> >>>> object-motion-combing.
> >>>>
> >>>> Any suggestions are very welcome. If I find this filter I will post a
> >> link
> >>>> to a 60FPS telecined
> >>>> video that will amaze everyone -- better than anything that Cuda can
> do.
> >>>>
> >>>> -Mark.
>
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