Fix audio normalizing for mute clips

Zulko · Jan 5, 2021 · abde0d7 · abde0d7
1 parent 6ab3efb
commit abde0d7
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Showing 2 changed files with 13 additions and 1 deletion.
diff --git a/moviepy/audio/fx/audio_normalize.py b/moviepy/audio/fx/audio_normalize.py
@@ -19,4 +19,7 @@ def audio_normalize(clip):
     """
 
     max_volume = clip.max_volume()
-    return volumex(clip, 1 / max_volume)
+    if max_volume == 0:
+        return clip.copy()
+    else:
+        return volumex(clip, 1 / max_volume)
diff --git a/tests/test_fx.py b/tests/test_fx.py
@@ -1,7 +1,9 @@
 import os
 
+import numpy as np
 import pytest
 
+from moviepy.audio.AudioClip import AudioClip
 from moviepy.audio.fx.audio_normalize import audio_normalize
 from moviepy.audio.io.AudioFileClip import AudioFileClip
 from moviepy.utils import close_all_clips
@@ -456,5 +458,12 @@ def test_normalize():
     close_all_clips(locals())
 
 
+def test_normalize_muted():
+    make_frame = lambda t: np.array([0.0])
+    clip = AudioClip(make_frame, duration=1, fps=44100)
+    clip = audio_normalize(clip)
+    close_all_clips(locals())
+
+
 if __name__ == "__main__":
     pytest.main()