moviepy.video.fx.all.accel_decel¶

moviepy.video.fx.all.accel_decel(clip, new_duration=None, abruptness=1.0, soonness=1.0)[source]¶

Accelerates and decelerates a clip, useful for GIF making.

Parameters:

new_durationfloat

Duration for the new transformed clip. If None, will be that of the current clip.

abruptnessfloat

Slope shape in the acceleration-deceleration function. It will depend on the value of the parameter:

-1 < abruptness < 0: speed up, down, up.
abruptness == 0: no effect.
abruptness > 0: speed down, up, down.

soonnessfloat

For positive abruptness, determines how soon the transformation occurs. Should be a positive number.

Raises:

ValueError: When sooness argument is lower than 0.

Examples

The following graphs show functions generated by different combinations of arguments, where the value of the slopes represents the speed of the videos generated, being the linear function (in red) a combination that does not produce any transformation.