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Create lipsync video by audio input. The tool will animate a digital human avatar to speak in sync with the provided audio. Parameters: - avatar: Digital human avatar ID. Either this or avatar creation parameters must be provided. - avatar_video_url: URL of a video to create the avatar from. - avatar_image_url: URL of an image to create the avatar from. - avatar_video_file: Local path to a video file to create the avatar from. - avatar_image_file: Local path to an image file to create the avatar from. - audio_url: Remote URL of the audio file. One of audio_url or audio_file must be provided. - audio_file: Local path to the audio file. One of audio_url or audio_file must be provided. - title: Optional title for the created video. - async_mode: If true, returns task_id immediately. If false, waits for completion and downloads the video. Default is false. - output_path: Where to save the downloaded video if async_mode is false. Default is "output.mp4". Avatar creation: Provide exactly ONE of avatar_video_url, avatar_image_url, avatar_video_file, or avatar_image_file to create a new avatar. If avatar ID is directly provided, these parameters will be ignored. Audio file should be mp3, m4a, or wav format, within 20MB, and between 1 second and 3 minutes. Returns: - If async_mode is true: task_id for checking status later - If async_mode is false: downloaded video path and task result - If download fails: error message, task_id, task_result, and video_url for manual download