raise ValueError(f"unknown file extension: {ext}") from e ValueError: unknown file extension: .mp4

[Suzixin7894946]

I have installed ffmpeg and set it to work, but when executing text to generate motion sequences, it keeps reporting errors when converting to videos. Have you ever encountered this.
My log file output is as follows：["a person walksclockwose to almost complete a cycle" (00) | Rep #00 | -> sample00_rep00.mp4]