PikaH3FlexVideoNode - ComfyUI Built-in Node Documentation

This node generates a video with synchronized audio from a text prompt, optionally anchored by a first frame, a last frame, or both. Pika H3 Flex is Pika’s post-trained MiniMax H3 model: it renders the picture and its sound in one pass, and you set the resolution, aspect ratio and duration. With no frame connected the node runs text to video; connecting a frame switches it to image to video.

Inputs

Parameter	Description	Data Type	Required	Range
`prompt`	What happens in the video, including the sound you want. Must not be empty. Default: "" (empty string).	STRING	Yes	1 to 8000 characters
`first_frame`	Optional image used as the opening frame. Connecting it runs image to video instead of text to video.	IMAGE	No	-
`last_frame`	Optional image used as the closing frame. Can be used together with `first_frame` or on its own.	IMAGE	No	-
`resolution`	Output resolution. `"1080p"` and above render at 768p and upscale once. The same seed at 480p gives a different video. Default: `"768p"`.	COMBO	Yes	`"480p"` `"768p"` `"1080p"` `"2k"` `"4k"`
`aspect_ratio`	Output aspect ratio. `"auto"` follows the first connected frame, otherwise the prompt. Default: `"auto"`.	COMBO	Yes	`"auto"` `"21:9"` `"16:9"` `"3:2"` `"4:3"` `"5:4"` `"1:1"` `"4:5"` `"3:4"` `"2:3"` `"9:16"` `"9:21"`
`duration`	Clip length in seconds. The output length follows a frame grid: 5 seconds gives 124 frames, about 5.17 seconds. Default: 5.	INT	Yes	5 to 15 seconds
`rewrite_prompt`	Let Pika expand the prompt first. The same seed then gives a different video on each run. Default: False.	BOOLEAN	Yes	true false
`seed`	Seed for sampling. With `rewrite_prompt` off, the same seed repeats the video exactly, though a local run with the same seed gives a different result. Default: 42.	INT	Yes	0 to 2147483647

Constraints:

The prompt must be between 1 and 8000 characters.
Billing follows the selected resolution and the clip length, counted per second of output.

Outputs

Output Name	Description	Data Type
`VIDEO`	The generated clip with its synchronized audio.	VIDEO

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​Inputs

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Inputs

Outputs