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BytePlusBytePlusBytePlus ModelArk for ComfyUI

Virtual Portrait - Existing Asset

Template
Virtual Portrait - Existing Asset, in the ComfyUI template browser under BytePlus
Workflow file
Virtual Portrait - Existing Asset.json
BytePlus nodes
Seedance 2.5 Reference to Video ×2, Asset Library
Keys needed
ModelArk API key, IAM access key and secret key
Also uses
Preview as Text, Save Video, Text (built into ComfyUI)

What it makes

Section titled “What it makes”

One 5 second video of your virtual portrait, made by Seedance 2.5 Reference to Video. The prompt is “asset1 walks along a beach at sunset, turns toward the camera and smiles. Waves, soft wind, cinematic lighting.” and asset1 is the portrait from your library. The template has two ways to point at the asset, so you can paste its ID or let a library lookup find it by name.

The workflow

Section titled “The workflow”
Two groups: Option A with an Asset ID text node into Seedance 2.5 Reference and Save Video, and Option B with Asset Library into a second Seedance 2.5 Reference
Option A (active) and Option B (bypassed until you switch the group to Always).
  1. Asset ID (from your library) is a text node. It holds a placeholder that you replace with the ID of your asset, and it feeds asset_1.
  2. Seedance 2.5 Reference to Video uses model Seedance 2.5 at 720p and 16:9 for 5 seconds with generate_audio on and task_type reference.
  3. Save Video keeps the clip under BytePlus/Video/Seedance_asset.
  4. Asset Library (Option B) lists assets with group_type AIGC and status Active, filtered by the name “My portrait” with max_results 1. Its asset_uris output goes to asset_1 of a second Seedance 2.5 Reference node, and assets_json goes to a Matching assets preview.

Run it

Section titled “Run it”
  1. Add your ModelArk API key and the IAM access key and secret key in Settings → BytePlus if you have not yet (API keys). The IAM keys need asset-library permission, and your account also needs Dreamina Seedance Advanced Creation Rights. The pack looks up the asset’s type with the IAM keys.
  2. Open the template browser and choose Virtual Portrait - Existing Asset under BytePlus.
  3. Option A: replace the placeholder in Asset ID (from your library) with your asset ID, then press Run.
  4. Option B: set the Option B group to Always, mute or bypass Option A (it would run with the placeholder ID), set name in Asset Library to your asset’s name, and press Run.

Settings worth changing

Section titled “Settings worth changing”
  • Prompt: refer to the portrait as asset1, as in the template. The node rewrites it for the model.
  • name and group_id (Asset Library): narrow the lookup to one asset. Keep max_results at 1 so exactly one URI reaches asset_1.
  • resolution, ratio and duration: change the size and length of the clip.
  • model: the node lists other Seedance models too, such as Seedance 2.0. Its page shows the options.
  • asset_2 and further inputs: add more assets, images, videos or audio as references.

Example result

Section titled “Example result”
Three frames of the saved video: a person with curly hair and a yellow cardigan walking on a beach at sunset and turning toward the camera
Example result: frames from the start, middle and end of the saved video.
The video from this example (Option A).

Time and cost

Section titled “Time and cost”

Each generation bills one Seedance 2.5 video. Looking up an asset in the library does not generate anything. The Seedance seed control is set to randomize, so every run makes a new clip and bills again. Set it to fixed and ComfyUI reuses the cached result of an unchanged workflow without billing. Only use media you are authorized to use.

Section titled “Related”