initial commit and version 1.0

moviepy/video/fx/MultiplySpeed.py

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+from dataclasses import dataclass
+
+from moviepy.Clip import Clip
+from moviepy.Effect import Effect
+
+
+@dataclass
+class MultiplySpeed(Effect):
+    """Returns a clip playing the current clip but at a speed multiplied by ``factor``.
+
+    Instead of factor one can indicate the desired ``final_duration`` of the clip, and
+    the factor will be automatically computed. The same effect is applied to the clip's
+    audio and mask if any.
+    """
+
+    factor: float = None
+    final_duration: float = None
+
+    def apply(self, clip: Clip) -> Clip:
+        """Apply the effect to the clip."""
+        if self.final_duration:
+            self.factor = 1.0 * clip.duration / self.final_duration
+
+        new_clip = clip.time_transform(
+            lambda t: self.factor * t, apply_to=["mask", "audio"]
+        )
+
+        if clip.duration is not None:
+            new_clip = new_clip.with_duration(1.0 * clip.duration / self.factor)
+
+        return new_clip