## The problem

hi, I run the script success: python scripts/sampling/simple_video_sample.py --input_path assets/000.jpg --version sv3d_u Initialized embedder #0: FrozenOpenCLIPImagePredictionEmbedder with 683800065 params. Trainable: False Initialized embedder #1: VideoPredictionEmbedderWithEncoder with 83653863 params. Trainable: False Initialized embedder #2: ConcatTimestepEmbedderND with 0 params.

## The fix

The sv3d_u output mp4 that would not play was caused by imageio's writer. Switch to cv2 (cv2.VideoWriter) for writing the output and the mp4 plays fine.