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Author: Dan Dennedy
To: Minimalistic plugin API for video effects
Subject: Re: [Frei0r] Fx parameters / Default value ?
On Sun, May 1, 2016 at 12:17 AM <d.j.a.y@???> wrote:

> Hi there,
> I am about to propose a patch for the "distort0r" effect
> adding a new 'velocity' parameter controlling ... the speed
> of the sinus wave.
> https://github.com/d-j-a-y/frei0r/commit/f122c70b94c47395d8a4c2eeee3ae699c3093a5a
> Without a default value set, there is a kind of "visual

The default value in your patch is 1.0, and we require params to have
default values now.

> compatibility" break : new version of the effect is slower,
> to reach the current (v1.5) visual effect of distort0r
> (and no adding "visual compatibility" break) the new parameter
> should be set to 80% (0.8).

> 1) Any idea about the default parameter value ?

According to a strict reading of this description, set it to 0.8 to
preserve the current behavior. You should strive not to break people's
existing projects and scripts.

> Or maybe i can add a second (bool) parameter :
> False - old behavior (based on time)
> True - new behavior (based on velocity) .
> 2) What do you think/prefer?

I think the bigger compatibility issue is that your f0r_update now ignores
the "time" call argument. Perhaps you should add a parameter to choose the
old versus new behavior (default to old). Then, you can have a more
preferable or suggested default for Velocity.