WanSoundImageToVideoExtend - ComfyUI Built-in Node Documentation

Complete documentation for the WanSoundImageToVideoExtend node in ComfyUI. Learn its inputs, outputs, parameters and usage.

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The WanSoundImageToVideoExtend node extends an existing video latent by generating additional frames, optionally guided by audio, a reference image, and a control video. It takes a starting video latent and produces a longer video sequence, using the provided conditioning and audio cues to influence the new content.

Inputs

Parameter	Data Type	Required	Range	Description
positive	CONDITIONING	Yes	-	Positive conditioning prompts that guide what the video should include
negative	CONDITIONING	Yes	-	Negative conditioning prompts that specify what the video should avoid
vae	VAE	Yes	-	Variational Autoencoder used for encoding and decoding video frames
length	INT	Yes	1 to MAX_RESOLUTION	Total number of frames to generate for the video sequence (default: 77, step: 4)
video_latent	LATENT	Yes	-	Initial video latent representation that serves as the starting point for extension. The width, height, batch size, and frame offset are derived from this latent.
audio_encoder_output	AUDIOENCODEROUTPUT	No	-	Optional audio embeddings that can influence video generation based on sound characteristics. When provided, the audio is interpolated and used to create an audio embedding bucket that is added to the conditioning.
ref_image	IMAGE	No	-	Optional reference image that provides visual guidance for the video generation. The image is upscaled to match the target dimensions and encoded into a latent, which is then added to both positive and negative conditioning.
control_video	IMAGE	No	-	Optional control video that can guide the motion and style of the generated video. The video is upscaled, encoded, and added to both positive and negative conditioning. The control video is truncated to the specified length.

Outputs

Output Name	Data Type	Description
positive	CONDITIONING	Processed positive conditioning with video context applied, including audio embeddings, reference latents, reference motion, and control video if provided
negative	CONDITIONING	Processed negative conditioning with video context applied, including audio embeddings (zeroed out), reference latents, reference motion, and control video if provided
latent	LATENT	Generated video latent representation containing the extended video sequence, initialized as zeros with dimensions derived from the input video_latent and the target length

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