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Guide

Concatenate videos with an API — not a concat.txt on a laptop.

Most “how to concatenate videos” articles teach FFmpeg’s concat demuxer. Product teams need an HTTP job: ordered input URLs, estimate, idempotent create, webhook, verified MP4. That is ffmpeg.stitch_export.v1 on RenderMac.

UGC pipeline diagram showing stitch then caption burn-in then deliver
Typical product path: ingest clips → stitch → optional caption burn-in → verify → deliver.

API-shaped stitch (not CLI)

  1. Collect trusted clip URLs in order in your app.
  2. Estimate ffmpeg.stitch_export.v1.
  3. Create with an idempotency key.
  4. On webhook success, verify the artifact.
CLI concat tutorials from Mux/Shotstack are excellent for local ops. This page is for SaaS backends that cannot SSH into a render box per customer.

Deeper: video stitching API, UGC pipeline, burn subtitles API.

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