Check every render before you trust it (free sample)
by PaperChaseWebb
One rule, one skill and four ffmpeg commands that make Claude Code or Codex look at its own video output (frames, cuts, loudness, captions) before it tells you it is done.
- Price
- Free
- Difficulty
- Beginner
- Setup
- 5 min
- Format
- .md file
check-every-render-before-you-trust-it-free-sample.md · 2 KB · direct download, no signup
What you end up with
Your agent reports problems with timestamps instead of calling a broken render finished.
What you get
- The render check rule for AGENTS.md or CLAUDE.md
- A render-checker SKILL.md
- Four ffmpeg commands for frames, loudness and black frames
Who it is for
Anyone whose agent renders or edits video and says done too early.
Works with
Solid chips: the agent is named in this listing's own tools list. Dashed chip: Plain Markdown, so it also pastes into other agents such as Grok Bot, Hermes, OpenClaw or Muse. We list those as compatible by format only, not as tested.
Tools needed
Cost to run: Free.
Time to result: Five minutes to install
Sample prompts, free to use
Run the render-checker skill on out/[file]. Report each problem with its timestamp and the smallest fix. Do not re-render until I have seen the list.
Seeing the list first keeps you in charge of the next render.
Free preview of the file
# Check every render before you trust it (free sample) A free sample from Video Production with AI Agents by PaperChaseWebb. Written for Claude Code and Codex. Coding agents will tell you a video is done the moment ffmpeg exits. The builders in our October 2026 research who got good results made the agent look at its own output first. video-use from the Browser Use team checks every cut point before it shows you anything, and the 3D product spot by @0xFizzu caught a vanished liquid and a floating label in test frames, not in the final render. This sample gives you the rule, the skill and the commands. ## The rule Add this to AGENTS.md or CLAUDE.md: ```text Before you report any render as done, run the render-checker skill. Never modify anything in sources/. Never upload or post a video without asking me. ``` ## The render-checker skill Save as `.claude/skills/render-checker/SKILL.md` (Claude Code) or `.agents/skills/render-checker/SKILL.md` (Codex). ```markdown --- name: render-checker description: Use before reporting any render as done. Checks frames, cuts and audio against the plan. --- 1. Read SHOTLIST.md if it exists, otherwise ask me what the video should show. 2. Probe the file: duration, size, fps, codec. Compare with the plan. 3. Extract frames at the start, middle and end of every shot, and one frame either side of every cut. 4. Look at each frame: text cut off or overlapped, wrong colors, faces cropped, blank or black frames. 5. Measure loudness and true pe
Worth knowing
- Sampling frames catches most problems but not all. Watch the final file yourself before publishing.
Questions
What is in the full pack?
The lane guide, project templates, 16 prompts, three more skills, publishing and privacy checklists, reported render times and 20 video project ideas.
Details
Version 1.0 · Updated Oct 26, 2026 · Markdown version of this page
License: Personal and commercial use. Download terms
Related
Video Production with AI Agents: lanes, prompts, skills and render checks
A Markdown playbook for making finished videos with Claude Code or Codex: pick a lane (draw in code, edit footage, script 3D or generate), plan with a shot list, render test frames, and make the agent check every render before you see it.
Render repeatable videos from HTML instead of a video model
A hands-on test of HyperFrames, an open-source tool that turns timed HTML pages into MP4 with headless Chrome and ffmpeg. Same input gives the same video, so changes are code edits instead of another roll of the dice. The tester also wrote down the gotchas.