Fix color inversion in video export

- Handle [-1, 1] range from diffusion models
- Properly normalize to [0, 1] before converting to uint8
- Add clipping to ensure valid color ranges

videogen.py

@@ -10184,11 +10184,13 @@ def main(args):
                 # Ensure frames are in 0-255 uint8 range for video export
                 if isinstance(frames, np.ndarray):
                     if frames.dtype == np.float32 or frames.dtype == np.float64:
-                        # Assume 0-1 range, convert to 0-255
-                        if frames.max() <= 1.0:
-                            frames = (frames * 255).astype(np.uint8)
-                        else:
-                            frames = frames.astype(np.uint8)
+                        # Check if values are in [-1, 1] range (common for diffusion models)
+                        if frames.min() < 0:
+                            # Convert from [-1, 1] to [0, 1]
+                            frames = (frames + 1.0) / 2.0
+                        # Now convert from [0, 1] to [0, 255]
+                        frames = np.clip(frames, 0.0, 1.0) * 255
+                        frames = frames.astype(np.uint8)
                     elif frames.dtype != np.uint8:
                         frames = frames.astype(np.uint8)