How to Add Captions to Video with an API
This guide shows a practical API workflow for captioning videos at scale without manual subtitle editing.
Key Takeaways
- Use queue-based processing for predictable throughput
- Track processing state through job polling or webhooks
- Keep output handling deterministic for downstream systems
1. Define a Repeatable Input Contract
Start with one accepted video format policy and clear file-size limits.
A stable upload contract prevents ingestion failures and makes automation easier.
2. Trigger Caption Jobs Programmatically
Use a dedicated endpoint for job creation with explicit caption and audio options.
Store job IDs immediately so your system can track status reliably.
3. Monitor Job State and Retrieve Output
Use polling for simple integrations and webhooks for event-driven delivery.
Treat completed files as immutable outputs and move them to your publish pipeline.
Frequently Asked Questions
Should I use polling or webhooks?
Polling is simpler for small workloads. Webhooks are better for larger automation pipelines.
Can I skip captions and only generate voiceover?
Yes, depending on your selected processing options and account tier.
Need API Implementation Help?
Start with the getting started docs, then move to full API integration once your workflow is stable.