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ZacharyZhang-NY e74dafcd36 Silence render-disposed spam, unbreak bundled skills, drop board wake

Three independently ugly bugs that all fed the same log flood:

* Electron's `WebFrameMain.send` writes every "Render frame was disposed"
  to stderr via `console.error`. When the worker fans a second
  agent-event past a reloading renderer, we produced thousands of
  identical lines and stalled the main loop on stderr I/O. Added a
  `mainFrame.detached` guard so the send is short-circuited before
  Electron's own catch block fires, and installed a targeted filter in
  `suppress-warnings.ts` (now actually imported from the entry point)
  so the specific `console.error("Error sending from webFrameMain:"…)`
  noise never reaches the terminal. Any other payload still surfaces.

* `dispatchAgentMessage` accepted the human-reader sentinel as a wake
  target when an agent replied to `__board__` — `wakeAgentIfPossible`
  then called `db.getAgent("__board__")`, threw, and the dispatcher
  kept repeating on every send. Strip `HUMAN_SENDER_ID` at
  `resolveMessageWakeTargets`, and keep a defense-in-depth guard in the
  heartbeat so a stray caller (future automation fan-out) cannot
  reintroduce the crash.

* Pi's skills loader rejects any SKILL.md whose frontmatter `name`
  diverges from its parent directory. The four bundled `my-writing-style`
  copies declared `name: writing-style-skill`, so every install emitted
  a warning and dropped the skill. They also lived as orphan gitlinks
  (mode 160000 without .gitmodules), and the global `*.md` gitignore
  hid every other SKILL.md from version control. Fixed the frontmatter
  to match the dir, converted the dangling submodules to plain trees,
  and allowlisted `builtin-skills/**/*.md` so a fresh clone carries the
  catalogue instead of silently losing it.

2026-04-20 08:13:48 -04:00

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name, description, metadata

name

description

metadata

calculate-metadata

Dynamically set composition duration, dimensions, and props

tags
calculateMetadata, duration, dimensions, props, dynamic

Using calculateMetadata

Use calculateMetadata on a <Composition> to dynamically set duration, dimensions, and transform props before rendering.

<Composition
  id="MyComp"
  component={MyComponent}
  durationInFrames={300}
  fps={30}
  width={1920}
  height={1080}
  defaultProps={{ videoSrc: "https://remotion.media/video.mp4" }}
  calculateMetadata={calculateMetadata}
/>

Setting duration based on a video

Use the getVideoDuration and getVideoDimensions skills to get the video duration and dimensions:

import { CalculateMetadataFunction } from "remotion";
import { getVideoDuration } from "./get-video-duration";

const calculateMetadata: CalculateMetadataFunction<Props> = async ({
  props,
}) => {
  const durationInSeconds = await getVideoDuration(props.videoSrc);

  return {
    durationInFrames: Math.ceil(durationInSeconds * 30),
  };
};

Matching dimensions of a video

Use the getVideoDimensions skill to get the video dimensions:

import { CalculateMetadataFunction } from "remotion";
import { getVideoDuration } from "./get-video-duration";
import { getVideoDimensions } from "./get-video-dimensions";

const calculateMetadata: CalculateMetadataFunction<Props> = async ({
  props,
}) => {
  const dimensions = await getVideoDimensions(props.videoSrc);

  return {
    width: dimensions.width,
    height: dimensions.height,
  };
};

Setting duration based on multiple videos

const calculateMetadata: CalculateMetadataFunction<Props> = async ({
  props,
}) => {
  const metadataPromises = props.videos.map((video) =>
    getVideoDuration(video.src),
  );
  const allMetadata = await Promise.all(metadataPromises);

  const totalDuration = allMetadata.reduce(
    (sum, durationInSeconds) => sum + durationInSeconds,
    0,
  );

  return {
    durationInFrames: Math.ceil(totalDuration * 30),
  };
};

Setting a default outName

Set the default output filename based on props:

const calculateMetadata: CalculateMetadataFunction<Props> = async ({
  props,
}) => {
  return {
    defaultOutName: `video-${props.id}.mp4`,
  };
};

Transforming props

Fetch data or transform props before rendering:

const calculateMetadata: CalculateMetadataFunction<Props> = async ({
  props,
  abortSignal,
}) => {
  const response = await fetch(props.dataUrl, { signal: abortSignal });
  const data = await response.json();

  return {
    props: {
      ...props,
      fetchedData: data,
    },
  };
};

The abortSignal cancels stale requests when props change in the Studio.

Return value

All fields are optional. Returned values override the <Composition> props:

durationInFrames: Number of frames
width: Composition width in pixels
height: Composition height in pixels
fps: Frames per second
props: Transformed props passed to the component
defaultOutName: Default output filename
defaultCodec: Default codec for rendering

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