How come Animate() isn't working?

[AviUser]

Hello,

How come this isn't working:
vid.Animate(start_frame = 0, end_frame = 150, filtername = "Tweak", bright = 1.00, bright = 0.00)

It gives me error:
Invalid Arguments to function "Animate"

Thanks.

[Gavino]

Animate does not support named arguments for the filter you are animating, you have to use positional parameters. This makes it a bit awkward with a filter like Tweak which has lots of arguments.

Since bright comes positionally after hue and sat, you need to add in the missing default values (0.0 and 1.0) for those parameters:
vid.Animate(0, 150, "Tweak", 0.0, 1.0, 1.00, 0.0, 1.0, 0.00)
A neater alternative in these cases is to define your own 'wrapper' function to supply the missing arguments and animate that instead.
function MyTweak(clip c, float bright) {
Tweak(c, bright=bright)
}

vid.Animate(0, 150, "MyTweak", 1.00, 0.00)

[AviUser]

:thanks:
Okay, I tried to do this:
function MyTweak(clip c, float brightness)
{
Tweak(c, bright = brightness)
}

vid = ImageSource("file.jpg").BicubicResize(320, 280).ConvertToYUY2()

return vid.Animate(0, 150, "MyTweak", 1.00, 0.00)

But, the video didn't change at all. It was just the same image without any change.

[Gavino]

Ah, that's because in Tweak, the bright parameter is additive (range -255.0 to +255.0), not a multiplier. So varying from 1.00 to 0.00 is probably too small a change to be visible. Sorry I didn't spot that earlier. You probably want something like

return vid.Animate(0, 150, "MyTweak", 0.0, -255.0)

[AviUser]

Okay, thanks!
(sorry late response)