[FFmpeg-devel] [GSoC] Motion Interpolation

[Davinder Singh]

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