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Developer uses Claude Code to auto-generate narrated product demo without any manual editing

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A solo developer used Claude Code, an agentic AI coding tool, to produce a fully narrated product demo video for ClinTrialFinder, a cancer clinical-trial matching tool, without touching a screen recorder or video editor. The agent automated three distinct steps: recording the live web app via a Playwright script, generating voiceover audio through the ElevenLabs text-to-speech API, and syncing narration to on-screen actions using logged timestamps and ffmpeg. Synchronization was achieved by logging key interaction moments during recording and aligning each narration phrase to its corresponding beat automatically. The entire pipeline — record, narrate, align, and assemble — runs as reusable code, meaning any product update can trigger a fresh, re-synced video with a single command. The developer noted this approach replaces four traditionally manual, skill-dependent steps with a single AI-guided conversation.

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