Merge Clips, Voiceover & Captions into MP4 (Apify) | n8n

Merge 1–10 clips, optional voiceover & SRT captions into a ready-to-post MP4 (Apify) — no FFmpeg hosting

This n8n workflow sends your video clips (plus optional voiceover and captions) to Apify’s Short Video Assembler API and returns a single finished MP4 URL—perfect for YouTube Shorts, Reels, and TikTok, without you running FFmpeg yourself.

What this workflow does

• Starts when you trigger the workflow manually in n8n.
• Builds a job payload containing a list of publicly accessible clip URLs (1–10), and optionally:
  • voiceover_url
  • captions_srt (SRT captions)
• Includes rendering settings such as orientation (vertical 1080×1920, horizontal, or square), fit (crop or pad), and max_seconds.
• Sends the payload to Apify, which scales/crops/pads clips, concatenates them, adds the voiceover, and burns captions into the output MP4.
• Returns the resulting public MP4 URL, plus render duration and job status.

Use cases

• Faceless AI video pipelines: automatically combine multiple generated clips into one Short with captions.
• Agency deliverables: standardize vertical edits for clients by passing clip + voice + SRT inputs.
• Content repurposing: batch-render TikTok/Reels variants by switching orientation and fit.

Technical details

• Apify integration: uses an Apify API token via HTTP Header Auth (Authorization: Bearer <YOUR_APIFY_TOKEN>).
• n8n nodes used: Manual Trigger, Set, Sticky Note, HTTP Request.
• Pricing: $0.20 per finished video on Apify; failed jobs and the demo are free.
• Requirements: an Apify account (free tier works) and video/audio at public http(s) URLs.