Create script-to-video avatar videos with HeyGen: n8n workflow

Create script-to-video avatar videos with HeyGen

Started by another system calling it, and works across Gmail, Google Drive and Slack. It puts OpenAI behind a retrieval step, so answers are drawn from documents you supply rather than from the model alone. 21 steps, 1 branch, 2 loops or waits: large, and worth reading before you trust it with anything live.

LargeCalls a model: OpenAIRetrieval

The flow

Starts it 2Model 8Logic 4Service 7

The steps in the order they run, from what starts it.

1Receive Script Request WebhookStarts it
2Apply Script Writing Memory ContextMemory Buffer WindowModel
3LLM Engine for Script RewritingLm Chat Open AiModel
4Validate Structured Script OutputOutput Parser StructuredModel
5Apply Notification Context MemoryMemory Buffer WindowModel
6LLM Engine for Notification GenerationLm Chat Open AiModel
7Validate Notification Output JSONOutput Parser StructuredModel
8Error Handler TriggerError triggerStarts it
9Parse Incoming Script PayloadCodeLogic
10Rewrite & Structure Video Script AgentModel
11Generate Completion Notifications AgentModel
12Slack: Send Error AlertSlackService
13Submit Video Generation Request to HeyGenHttp RequestService
14Send Video Ready Email NotificationGmailService
15Send Video Ready Slack NotificationSlackService
16Wait Before Checking Video StatusWaitLogic
17Check HeyGen Video Status1Http RequestService
18Wait Before Rechecking StatusWaitLogic
19Evaluate Video Completion StatusIfLogic
20Download Generated HeyGen VideoHttp RequestService
21Upload Generated Video to Google DriveGoogle DriveService

How it's built

Starts on: Another system calling it
Steps: 21, with 1 branch, 2 loops or waits
Size: Large: read it before trusting it with anything live
Connects to: Gmail, Google Drive, Slack
Model: OpenAI
Retrieval: Answers are drawn from documents you supply, not from the model alone

Questions

What does it need to run?

An n8n account, plus your own Gmail, Google Drive and Slack accounts, and a key for OpenAI. You connect your own accounts after importing it; none are included.

What starts it?

It starts on another system calling it.

Does it use AI?

Yes. It calls OpenAI. Its answers draw on documents you give it, not on the model alone. Model calls are billed by the provider, not by n8n.

How long does it take to set up?

Take your time. At 21 steps it is large: read it before trusting it with anything live.

How do I import it?

Copy the workflow, open a new workflow in n8n and paste. The steps appear on the canvas, ready for your own accounts.

Before you run it

Nothing here has been tested by us. It is somebody's working automation, read and described from its own steps. Treat the connections it wants as a list of accounts it will touch, and read the 21 steps before you point it at anything that matters.