[FFmpeg-devel] [PATCH] avfilter: add skipblend filter

[Paul B Mahol]

On 11/1/18, Matthias Troffaes <matthias.troffaes at gmail.com> wrote:
> Dear Paul,
>
> On Thu, Nov 1, 2018 at 11:21 AM Matthias Troffaes
> <matthias.troffaes at gmail.com> wrote:
>> Would you consider accepting a patch that added an integer "cutoff"
>> option to tmix, for the purpose of setting all weights for frames
>> beyond "cutoff" to 0? The reason for requesting this is that in some
>> workflows, one is blending together a lot of frames at once, and
>> specifying a vector of, say, 100 ones followed by a zero, when
>> blending together, say, 200 frames, whilst possible, is rather
>> tedious; for instance "tmix=frames=200:cutoff=100" (weights are 1 by
>> default so this should then work as expected).
>
> I found a way of doing this differently, as I now found that tmix
> doesn't actually step frames, unlike skipblend. For history's sake,
> the way to get skipblend behaviour is to do something like
> "tmix=frames=100,framestep=150" for instance assuming you want to
> blend 100 frames, skip 50, and so on. It is *much* slower compared to
> skipblend by quite a large factor, as tmix does a lot of redundant
> computations, but it works.

I think that adding option to skip some frames can be added.