[FFmpeg-devel] [GSoC] Motion Interpolation

Davinder Singh ds.mudhar at gmail.com
Tue Aug 30 04:13:03 EEST 2016


On Sat, Aug 27, 2016 at 6:15 PM Robert Kr├╝ger <krueger at lesspain.software>
wrote:

> [...]
> what is the way to best contribute with test cases? I have two samples that
> I use for testing, so far the results look very, very promising but there
> are still a few artefact problems, so these could maybe serve as a good
> test case. In some cases the artefacts almost certainly look like there is
> a bug in motion vector calculation as a very large area suddenly begins to
> move in which really only a small part is/should be moving.
>
> How do I make this available to you or other devs at this stage? Just trac
> tickets or is it too early for that and you would like to work on this
> differently? After all it is always a grey area, when this can be
> considered solved, as it is a process of gradual improvements, so maybe
> it's not well-suited for a ticket.
>
> Let me know. Happy to contribute samples and some testing time here and
> there.
>

I'm currently testing support for unrestricted search area which can be
used with EPZS, which has improved the quality.
Once I send the patch you can test if it actually reduces the artifacts or
doesn't make it worse.

For smaller details newer recursive algorithms should perform better. Like
this one, https://www.osapublishing.org/jdt/abstract.cfm?uri=jdt-11-7-580
which uses Modified 3D recursive search iteratively.
So, at this point before any new algorithm is implemented, best way to test
is to verify the experiments I do improves the quality for most of the
samples or not.

One would like to compare PSNR, as it's hard compare each frame visually.
http://ffmpeg.org/pipermail/ffmpeg-devel/2016-April/193067.html (for better
results, original sample should be 60fps, subsampled to 30)
for visual testing, I used to transcode interpolate sample to images and
compared them to original ones.

Thanks for testing.


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