[Bf-committers] External effects for VSE and or compositor nodes

[Piotr Arlukowicz]

Hi Gaspar,
the code shown by diff does not look too scary, I understand nearly
everything I can see there. The only hard point for me is HOW to get to
know all the organization, all those constants, etc. How you did get to
know how VSE works? This is the most hard part for me, not the programming
itself at all, but the UNDERSTANDING. :)
Unfortunately, I did not found anything more than the git source, and
reverse-engineering and code-reading is not efficient way at all. Can you
shed some light how was your path to writing such a code? How you did all
necessary components and dependencies?

regards
pio


​Piotr
​ Arlukowicz, BFCT​

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2017-03-15 2:32 GMT+01:00 Gaspar Fernández <blakeyed at totaki.com>:

> Hi!
>
> Again posting about this topic. I know some of you don't find this
> interesting but I do. So I have made a tiny demo. The code is not so
> clean right now, but it works. And I may optimize it a little bit more.
>
> I know the effects in the video are so silly, and some of them can be
> done in a 3D view or the compositor, or working with Curves. it was just
> a demo to integrate MLT effects into Blender. With this I could embed
> some more Just an experiment: https://youtu.be/sJKkSDvwDbE with this I
> could link some more effects.
>
>
> Saludos
> ------------------------------------------------------------------------
>
> Gaspar Fernández
>
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>
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>
>
>
> El 13/03/17 a las 05:00, Gaspar Fernández escribió:
> > Hi all!
> >
> > There are only a few effects in Blender for VSE or compositor. I've been
> > thinking about that for years. Even I found, in the past Blender used a
> > C api to allow external effect plugins
> > (https://wiki.blender.org/index.php/Doc:2.4/Manual/
> Sequencer/Effects/Plugins).
> > And don't know why this feature isn't supported now.
> >
> > Looking for a solution I tried to make my Blender build run image
> > filters via Python API but it's very slow (2 frames/sec for a very very
> > easy effect, inverting red and blue channels and alpha to 50%), also I
> > did not tested using a Python lib so Python will be just calling my C
> > lib which does the effect. But I think it may be better making them
> > directly in C or C++, I've tested doing the same simple effect in C and
> > it's realtime.
> >
> > I also thought about using a pluggable library for doing this (just
> > effects on images or videos), like MLT, where we can add a lot of
> > effects and image generators (another very very interesting feature for
> > me). It's really difficult to render a strip, apply one effect with
> > another program and import the new footage with effect, and sometimes
> > animating effect properties or doing little changes is awful repeating
> > the whole process again.
> >
> > What do you think about that?
> >
> > I've been playing with MLT source, if you think this is interesting I
> > think I could make a POC integrating one effect into VSE to see how it
> > behaves.
> >
> > Best regards,
> > ------------------------------------------------------------------------
> >
> > Gaspar Fernández
> >
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> >
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