初始化提交

app/services/utils/video_effects.py

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