74 lines
2.4 KiB
Python
74 lines
2.4 KiB
Python
from moviepy import Clip, ColorClip, CompositeVideoClip, vfx
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# FadeIn
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def fadein_transition(clip: Clip, t: float) -> Clip:
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return clip.with_effects([vfx.FadeIn(t)])
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# FadeOut
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def fadeout_transition(clip: Clip, t: float) -> Clip:
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return clip.with_effects([vfx.FadeOut(t)])
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# SlideIn
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def slidein_transition(clip: Clip, t: float, side: str) -> Clip:
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width, height = clip.size
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# MoviePy 内置 SlideIn 在当前这条处理链里对全屏素材不稳定，
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# 会出现“逻辑上应用了转场，但画面几乎看不出变化”的情况。
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# 这里改成显式黑底 + 位移动画，保证转场效果可见且行为可控。
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def position(current_time: float):
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progress = min(max(current_time / max(t, 0.001), 0), 1)
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if side == "left":
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return (-width + width * progress, 0)
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if side == "right":
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return (width - width * progress, 0)
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if side == "top":
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return (0, -height + height * progress)
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if side == "bottom":
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return (0, height - height * progress)
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return (0, 0)
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background = ColorClip(size=(width, height), color=(0, 0, 0)).with_duration(
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clip.duration
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)
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moving_clip = clip.with_position(position)
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return CompositeVideoClip([background, moving_clip], size=(width, height)).with_duration(
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clip.duration
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)
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# SlideOut
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def slideout_transition(clip: Clip, t: float, side: str) -> Clip:
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width, height = clip.size
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transition_start = max(clip.duration - t, 0)
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# SlideOut 同样改成显式位移，保证片段末尾能稳定滑出画面。
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def position(current_time: float):
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if current_time <= transition_start:
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return (0, 0)
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progress = min(
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max((current_time - transition_start) / max(t, 0.001), 0), 1
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)
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if side == "left":
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return (-width * progress, 0)
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if side == "right":
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return (width * progress, 0)
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if side == "top":
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return (0, -height * progress)
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if side == "bottom":
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return (0, height * progress)
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return (0, 0)
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background = ColorClip(size=(width, height), color=(0, 0, 0)).with_duration(
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clip.duration
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)
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moving_clip = clip.with_position(position)
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return CompositeVideoClip([background, moving_clip], size=(width, height)).with_duration(
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clip.duration
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)
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