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4813ed753f
Ports functionality from 10+ separate plugins into ECC so users only need one plugin installed. Consolidates: pr-review-toolkit, feature-dev, commit-commands, hookify, code-simplifier, security-guidance, frontend-design, explanatory-output-style, and personal skills. New agents (8): code-architect, code-explorer, code-simplifier, comment-analyzer, conversation-analyzer, pr-test-analyzer, silent-failure-hunter, type-design-analyzer New commands (9): commit, commit-push-pr, clean-gone, review-pr, feature-dev, hookify, hookify-list, hookify-configure, hookify-help New skills (8): frontend-design, hookify-rules, github-ops, knowledge-ops, lead-intelligence, oura-health, pmx-guidelines, remotion Enhanced skills (8): article-writing, content-engine, market-research, investor-materials, investor-outreach, x-api, security-scan, autonomous-loops — merged with personal skill content New hook: security-reminder.py (pattern-based OWASP vulnerability warnings on file edits) Totals: 36 agents, 69 commands, 128 skills, 29 hook scripts
105 lines
2.9 KiB
Markdown
105 lines
2.9 KiB
Markdown
---
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name: calculate-metadata
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description: Dynamically set composition duration, dimensions, and props
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metadata:
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tags: calculateMetadata, duration, dimensions, props, dynamic
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---
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# Using calculateMetadata
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Use `calculateMetadata` on a `<Composition>` to dynamically set duration, dimensions, and transform props before rendering.
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```tsx
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<Composition id="MyComp" component={MyComponent} durationInFrames={300} fps={30} width={1920} height={1080} defaultProps={{videoSrc: 'https://remotion.media/video.mp4'}} calculateMetadata={calculateMetadata} />
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```
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## Setting duration based on a video
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Use the `getMediaMetadata()` function from the mediabunny/metadata skill to get the video duration:
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```tsx
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import {CalculateMetadataFunction} from 'remotion';
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import {getMediaMetadata} from '../get-media-metadata';
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const calculateMetadata: CalculateMetadataFunction<Props> = async ({props}) => {
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const {durationInSeconds} = await getMediaMetadata(props.videoSrc);
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return {
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durationInFrames: Math.ceil(durationInSeconds * 30),
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};
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};
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```
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## Matching dimensions of a video
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```tsx
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const calculateMetadata: CalculateMetadataFunction<Props> = async ({props}) => {
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const {durationInSeconds, dimensions} = await getMediaMetadata(props.videoSrc);
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return {
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durationInFrames: Math.ceil(durationInSeconds * 30),
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width: dimensions?.width ?? 1920,
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height: dimensions?.height ?? 1080,
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};
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};
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```
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## Setting duration based on multiple videos
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```tsx
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const calculateMetadata: CalculateMetadataFunction<Props> = async ({props}) => {
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const metadataPromises = props.videos.map((video) => getMediaMetadata(video.src));
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const allMetadata = await Promise.all(metadataPromises);
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const totalDuration = allMetadata.reduce((sum, meta) => sum + meta.durationInSeconds, 0);
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return {
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durationInFrames: Math.ceil(totalDuration * 30),
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};
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};
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```
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## Setting a default outName
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Set the default output filename based on props:
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```tsx
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const calculateMetadata: CalculateMetadataFunction<Props> = async ({props}) => {
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return {
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defaultOutName: `video-${props.id}.mp4`,
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};
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};
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```
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## Transforming props
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Fetch data or transform props before rendering:
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```tsx
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const calculateMetadata: CalculateMetadataFunction<Props> = async ({props, abortSignal}) => {
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const response = await fetch(props.dataUrl, {signal: abortSignal});
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const data = await response.json();
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return {
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props: {
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...props,
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fetchedData: data,
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},
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};
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};
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```
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The `abortSignal` cancels stale requests when props change in the Studio.
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## Return value
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All fields are optional. Returned values override the `<Composition>` props:
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- `durationInFrames`: Number of frames
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- `width`: Composition width in pixels
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- `height`: Composition height in pixels
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- `fps`: Frames per second
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- `props`: Transformed props passed to the component
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- `defaultOutName`: Default output filename
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- `defaultCodec`: Default codec for rendering
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