[FFmpeg-user] Seeking smart decomb filter

[Mark Filipak (ffmpeg)]

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.

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.