[FFmpeg-user] Seeking smart decomb filter

[Paul B Mahol]

On Thu, Jan 21, 2021 at 1:31 PM Paul B Mahol <onemda at gmail.com> wrote:

>
>
> 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.
>

Also, the only way to "invent" new frames is to use either motion
interpolation via optical flow or via blocks interpolation like with
minterpolate filter.


>
>
>>
>> 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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>
>