generated from thinkode/modelRepository
37 lines
1.1 KiB
Python
37 lines
1.1 KiB
Python
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from dataclasses import dataclass
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import numpy as np
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from moviepy.Clip import Clip
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from moviepy.Effect import Effect
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@dataclass
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class FadeIn(Effect):
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"""Makes the clip progressively appear from some color (black by default),
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over ``duration`` seconds at the beginning of the clip. Can be used for
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masks too, where the initial color must be a number between 0 and 1.
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For cross-fading (progressive appearance or disappearance of a clip
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over another clip, see ``CrossFadeIn``
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"""
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duration: float
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initial_color: list = None
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def apply(self, clip: Clip) -> Clip:
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"""Apply the effect to the clip."""
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if self.initial_color is None:
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self.initial_color = 0 if clip.is_mask else [0, 0, 0]
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self.initial_color = np.array(self.initial_color)
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def filter(get_frame, t):
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if t >= self.duration:
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return get_frame(t)
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else:
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fading = 1.0 * t / self.duration
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return fading * get_frame(t) + (1 - fading) * self.initial_color
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return clip.transform(filter)
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