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How to record short gameplay clips of NPCs talking to each other with NPC Talk

Produce 5 to 10 second conversation clips with a fixed gameplay camera and lines rendered first.

  • Games and hobbies
  • Intermediate
  • 2 hours
  • From the README
  • Claude Code
  • Codex
  • Cursor
  • Gemini CLI

Authorization notice. NPC Talk is dual-use. Only use it on software, sites and systems you own or have explicit permission to test.

Reverse engineering. Clips of a game can contain copyrighted game audio and dialogue, which the README says must never be published.

Who it is forA modder preparing a showcase video of their NPC mod for a community post or a game dev channel.

The problemShowcase footage of a talking NPC is hard to make look like normal gameplay and to sync with rendered lines.

The outcomeShort gameplay-style clips of an NPC conversation, ready to share, with lines rendered before filming.

What you need first

  • A game you own, ideally single-player (the README says never inject into online games with anti-cheat)
  • Git, Python 3.10+, uv and ffmpeg
  • A Modal account for the GPU voice server, with the NPCVOICE_TOKEN environment variable set
  • A fal key (FAL_KEY) for speech-to-text and the MCP server
  • A Cerebras key (CEREBRAS_API_KEY) for the NPC's lines
  • Optional: a TypeSafe key (TYPESAFE_API_KEY) for actions and spoken orders
  • Windows and the .NET SDK (8+) only if you follow the GTA V example

Steps

  1. Install the skills with npx skills add https://github.com/christos-antono/NPCTalk if you are not using a plugin install.
  2. Ask the npc-showcase-clips skill to plan the scene, with a fixed gameplay camera and lines rendered first.
  3. Render the lines with npctalk say, then check the timings.
  4. Record the clip in the game, sync the audio, and cut it to 5 to 10 seconds.
  5. Run npctalk check before publishing the clip folder so no game audio or transcripts leak.

Prompt for your agent

Using the NPCTalk repo at https://github.com/christos-antono/NPCTalk, run the npc-showcase-clips skill to plan a 5 to 10 second conversation between <npc-a> and <npc-b> in <game-name>. Expected output: a planned shot list and rendered line WAVs with timings. Verify that the clip stays within 5 to 10 seconds and that `npctalk check` passes before anything is shared.

Caveat. The README says the showcase clips must not include game audio or a game's dialogue when published, so keep recordings private unless you have rights to share them.

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