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‎.gitignore‎

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.DS_Store
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node_modules
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lib*

‎.prettierrc‎

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{
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"printWidth": 120,
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"tabWidth": 2,
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"useTabs": false,
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"semi": false,
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"singleQuote": true,
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"trailingComma": "all",
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"bracketSpacing": true,
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"jsxBracketSameLine": false,
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"arrowParens": "avoid",
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"endOfLine": "lf"
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}

‎LICENSE‎

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Copyright 2022 Simon Andersson
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Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
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The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

‎README.md‎

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# filter-complex graph generator
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Module to generate ffmpeg filter complex graphs with code.
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### Usage
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```typescript
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const graph = createFilterGraph([
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{
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inputs: '0:v',
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filters: [
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{
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name: 'fade',
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options: {
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type: 'in',
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st: 0,
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duration: 1,
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},
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},
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{
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name: 'scale',
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options: '512:-2',
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},
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],
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},
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])
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console.log(graph)
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// [0:v]fade=type=in:st=0:duration=1,scale=512:-2
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```
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```typescript
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const graph = createFilterGraph([
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{
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inputs: '0:v',
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outputs: ['v1', 'v2'],
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filters: {
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name: 'split',
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},
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},
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{
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inputs: 'v1',
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outputs: 'v1_out',
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filters: [
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{
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name: 'scale',
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options: {
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w: '128',
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h: '-2',
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},
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},
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{
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name: 'trim',
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options: {
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start: 1,
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duration: 5,
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},
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},
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{
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name: 'setpts',
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options: 'PTS-STARTPTS',
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},
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],
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},
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{
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inputs: ['v2', 'v1_out'],
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outputs: 'output',
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filters: {
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name: 'overlay',
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options: {
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x: '(W-w)/2',
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y: 'H-h-20',
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enable: 'between(t, 0, 5)',
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},
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},
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},
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])
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console.log(graph)
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//[0:v]split[v1][v2];
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//[v1]scale=w=128:h=-2,trim=start=1:duration=5,setpts=PTS-STARTPTS[v1_out];
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//[v2][v1_out]overlay=x=(W-w)/2:y=H-h-20:enable=between(t\, 0\, 5)[output]
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```

‎package.json‎

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{
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"name": "filter_complex",
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"version": "0.1.0",
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"description": "filter complex generator",
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"repository": "https://github.com/hellozimi/filter-complex",
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"author": "Simon Andersson",
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"license": "MIT",
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"private": true,
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"main": "./lib/cjs/index.js",
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"types": "./lib/cjs/main.d.ts",
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"module": "./lib/esm/index.js",
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"files": [
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"lib/"
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],
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"scripts": {
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"prepublishOnly": "yarn tsc",
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"tsc": "tsc -p tsconfig.json && tsc -p tsconfig-cjs.json"
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},
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"dependencies": {},
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"devDependencies": {
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"@types/node": "^17.0.22",
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"typescript": "^4.6.2",
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"ts-node": "^10.7.0"
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}
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}

‎src/filter-complex.ts‎

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/**
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* Filter option can be a string and a number. If the value is a ffmpeg function
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* like `between` or `select` the parser will escape the commas for you.
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*/
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export type FilterOptionValue = string | number
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export type Filter = {
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name: FilterOptionValue
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options?: Record<string, FilterOptionValue> | FilterOptionValue
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}
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export type FilterOperation = {
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inputs: string | string[]
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outputs?: string | string[]
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filters: Filter | Filter[]
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}
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/**
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* Reg exp for finding a function including multple parameters.
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* Example: between(t, 10, 20)
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*/
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const filterFunctionRegExp = /\w+\(([\w\d\s]+,)+[\w\d\s]+\)/
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/**
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* Formats the filter option value. If it's a ffmpeg function the commas will
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* be escaped automatically.
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*/
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function formatFilterOptionValue(value: FilterOptionValue): string {
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if (typeof value === 'string' && filterFunctionRegExp.test(value)) {
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return value.replaceAll(/(\s+)?,(\s+)?/g, '\\, ')
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}
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return `${value}`
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}
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function formatStream(stream: string): string {
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return `[${stream}]`
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}
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function formatFilterOptions(options: NonNullable<Filter['options']>) {
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if (typeof options !== 'object') {
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return formatFilterOptionValue(options)
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}
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return Object.entries(options)
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.map(([name, value]) => `${name}=${formatFilterOptionValue(value)}`)
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.join(':')
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}
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function formatFilter({ name, options }: Filter) {
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const formattedOptions = options && formatFilterOptions(options)
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return [name, formattedOptions].filter(v => v).join('=')
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}
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function formatOperation({ inputs, filters, outputs }: FilterOperation): string {
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const ins = (Array.isArray(inputs) ? inputs : [inputs]).map(formatStream).join('')
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const ops = (Array.isArray(filters) ? filters : [filters]).map(formatFilter).join(',')
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const outs = outputs ? (Array.isArray(outputs) ? outputs : [outputs]).map(formatStream).join('') : null
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return [ins, ops, outs].filter(v => v).join('')
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}
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export function createFilterGraph(operations: FilterOperation[]): string {
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return operations.flatMap(formatOperation).join(';')
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}
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export function prettyPrint(filterGraph: string) {
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return filterGraph.replaceAll(';', ';\n')
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}

‎src/index.ts‎

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export { createFilterGraph, Filter, FilterOptionValue, FilterOperation, prettyPrint } from './filter-complex'

‎tsconfig-cjs.json‎

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{
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"extends": "./tsconfig.json",
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"compilerOptions": {
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"module": "CommonJS",
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"outDir": "./lib/cjs"
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}
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}

‎tsconfig.json‎

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{
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"compilerOptions": {
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"target": "es5",
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"module": "commonjs",
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"outDir": "build",
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"strict": true,
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"esModuleInterop": true,
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"forceConsistentCasingInFileNames": true,
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"downlevelIteration": true,
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"noImplicitAny": true,
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"moduleResolution": "node",
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"lib": ["es5", "es6", "es2018", "esnext", "esnext.asynciterable"],
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"typeRoots": ["./node_modules/@types"],
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"outDir": "./lib/esm",
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"declaration": true
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},
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"exclude": ["node_modules", "lib"],
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"include": ["src/**/*.ts"]
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}

‎yarn.lock‎

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