[FFmpeg-devel] [GSoC] Motion Interpolation

[Davinder Singh]

On Tue, Aug 16, 2016, 1:47 AM Paul B Mahol <onemda at gmail.com> wrote:

> On 8/15/16, Davinder Singh <ds.mudhar at gmail.com> wrote:
> > On Tue, Aug 16, 2016 at 1:40 AM Davinder Singh <ds.mudhar at gmail.com>
> wrote:
> >
> >> On Sat, Aug 13, 2016 at 8:05 PM Paul B Mahol <onemda at gmail.com> wrote:
> >>
> >>> [...]
> >>
> >>
> >>> Also, why is there no code for scene change detection?
> >>> If scene changes abruptly it will give bad frame.
> >>>
> >>
> >> added scene change detection from framerate filter:
> >>
> >>
> https://github.com/dsmudhar/FFmpeg/commit/1ad01c530569dfa1f085a31b6435597a97001a78
> >>
> >> On Sat, Aug 13, 2016 at 10:41 PM Michael Niedermayer
> >> <michael at niedermayer.cc> wrote:
> >>
> >>> [...]
> >>
> >>
> >>> the motion estimation should already produce a "matching score" of some
> >>> kind for every block, its sum is probably a good indication how
> >>> similar frames are
> >>> the sum probably would need to be compared to some meassure of variance
> >>> for the frame so near black frames dont get better matches
> >>> a bit like a correlation coefficient
> >>> you can also look at
> >>> git grep scene libavcodec/mpegvideo* libavcodec/motion_es*
> >>>
> >>
> >> i also tested comparing sum of SBAD score but it gave me mostly false
> >> detection.
> >> vf_framerate one works even with dark scenes (i reduced threshold from 7
> >> to 5) correctly, though it doesn't consider any motion.
> >>
> >
> > i currently duplicate the frames for one loop of interpolations (until
> next
> > frame arrives), blending can also be done.
> >
> https://github.com/dsmudhar/FFmpeg/blob/1ad01c530569dfa1f085a31b6435597a97001a78/libavfilter/vf_minterpolate.c#L1101
> > which one you think would be better? frame dup seems perfect to me
>
> What about artifacts with UMH?
> See for example this sample:
> https://media.xiph.org/video/derf/y4m/in_to_tree_420_720p50.y4m


Trying to improve the quality of frames. The "smoothness" term, suggested
by Michael, should reduce the artifacts.

>
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