SeedVR2ProgressiveSampler - ComfyUI Built-in Node Documentation

Sequential temporal chunking sampler for SeedVR2 native workflows. This node processes long video latents by splitting them into smaller temporal chunks, sampling each chunk sequentially, and blending the results together. It serves as a drop-in replacement for the standard KSampler when working with SeedVR2 models on sequences that would otherwise cause out-of-memory errors.

Inputs

Parameter	Description	Data Type	Required	Range
`model`	The model used for denoising the input latent	MODEL	Yes
`seed`	The random seed used for creating the noise (default: 0)	INT	Yes	0 to 0xffffffffffffffff
`steps`	The number of steps used in the denoising process (default: 20)	INT	Yes	1 to 10000
`cfg`	The Classifier-Free Guidance scale balances creativity and adherence to the prompt. Higher values result in images more closely matching the prompt however too high values will negatively impact quality (default: 1.0)	FLOAT	Yes	0.0 to 100.0
`sampler_name`	The algorithm used when sampling, this can affect the quality, speed, and style of the generated output	COMBO	Yes	Multiple options available
`scheduler`	The scheduler controls how noise is gradually removed to form the image	COMBO	Yes	Multiple options available
`positive`	The conditioning describing the attributes you want to include in the image	CONDITIONING	Yes
`negative`	The conditioning describing the attributes you want to exclude from the image	CONDITIONING	Yes
`latent`	The latent image to denoise	LATENT	Yes
`denoise`	The amount of denoising applied, lower values will maintain the structure of the initial image allowing for image to image sampling (default: 1.0)	FLOAT	Yes	0.0 to 1.0
`frames_per_chunk`	Pixel frames per temporal chunk. Must be a 4n+1 value (1, 5, 9, 13, 17, 21, …) to match SeedVR2 constraints (default: 21)	INT	Yes	1 to 16384 (step of 4)
`temporal_overlap`	Latent frames blended between adjacent chunks to hide the seam; 0 means no blend (default: 0)	INT	Yes	0 to 16384
`chunking_mode`	manual = use frames_per_chunk exactly; auto = shrink the chunk until it fits in VRAM (default: “manual”)	COMBO	Yes	”manual" "auto”

Note on frames_per_chunk: This parameter must be a 4n+1 pixel-frame count (1, 5, 9, 13, 17, 21, …). The node will raise an error if an invalid value is provided. Note on temporal_overlap: The overlap value is automatically capped to be at most one less than the latent chunk size to ensure valid chunk processing. Note on chunking_mode: When set to “auto”, the node will automatically try smaller chunk sizes if the current chunk causes an out-of-memory error. If all attempts fail, the node raises an error.

Outputs

Output Name	Description	Data Type
`latent`	The denoised latent output, concatenated from all temporal chunks back into a single collapsed SeedVR2 latent tensor	LATENT

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