UnMarkAI n8n Workflow: Remove Burned-In Captions from HTTPS Video

Remove Burned-In Captions from HTTPS Video with UnMarkAI (n8n Workflow)

Need to prepare an authorized video for caption replacement, localization, or product-copy updates? This UnMarkAI n8n workflow imports a direct HTTPS video, removes burned-in captions/text, and provides a temporary download link—so you can review results and re-render new text where needed.

What this workflow does

• Configure Video settings: Start the workflow manually and load the source HTTPS URL, original dimensions, removal region coordinates, the required request key, and polling limits.
• Validate inputs: It checks the HTTPS URL, dimensions, region coordinates, and the required request key before processing.
• Preview API behavior (optional): Keep execute_paid_job=false to run a no-request preview of the intended API calls.
• Run paid processing (when enabled): Import the video URL and poll upload status until ready (or until a bounded limit is reached).
• Create one UnMarkAI text-removal job: Uses stable idempotency keys for the POST requests; automatic retries are off.
• Poll for completion & return results: Polls within bounded limits and then returns a temporary result link. Download promptly and inspect the full clip for missed text, softened detail, or motion artifacts.

Use cases

• Replace burned-in captions before localizing product videos or onboarding content.
• Update on-screen product copy while preserving the original footage.
• Prepare assets for re-edits where new typography must be re-applied cleanly.
• Build a controlled n8n pipeline for authorized caption/text removal from HTTPS video files.

Technical details

• Workflow category: n8n automation workflow
• Tech stack / nodes: if, set, code, wait, sticky note, http request
• UnMarkAI processing: Single text-removal job with idempotency keys and bounded polling.
• Auth setup: Create an n8n Header Auth credential where the header name is Authorization and value is Bearer YOUR_API_KEY (jobs:read and jobs:write).

Template note: The template is free, but API processing is billed separately.