@calipsa/video-utils/src/getVideoSnapshots/index.ts

Video utilities

import ffmpeg, {
  FfmpegCommandOptions,
  FfmpegCommand,
} from 'fluent-ffmpeg'

import {
  StreamWithFrames,
} from '@calipsa/stream-utils'

interface Options {
  path: string,
  rate: number,
  format: 'jpg' | 'png',
  ffmpegCommandOptions?: FfmpegCommandOptions,
  configureFfmpeg?: (ffmpegCommand: FfmpegCommand) => void,
}

export default async ({
  path,
  rate = 1,
  format = 'jpg',
  ffmpegCommandOptions,
  configureFfmpeg,
}: Options) =>
  new Promise<Buffer[]>((resolve, reject) => {
    const outStream = new StreamWithFrames(rate)

    const vcodec = format === 'png' ? 'png' : 'mjpeg'

    const proc = ffmpeg(path, ffmpegCommandOptions)
      .output(outStream, {
        end: true,
      })
      .noAudio()
      .format('image2pipe') // -f
      .videoCodec(vcodec) // -vcodec
      .size('640x480')
      .outputOption('-q:v', '2')
      .on('error', reject)
    // .on('start', commandLine => {
    //   console.log(`Spawned Ffmpeg with command: ${commandLine}`)
    // })
      .on('end', () => {
        resolve(outStream.buffers)
      })

    configureFfmpeg?.(proc)

    proc.run()
  })