Tdarr-QSV-vfparameters.js

function createVfParameter(stream) {
  let deinterlace = false, hdrToSDR = false, resize = false;
  
  // deinterlace
  if (stream.field_order !== 'progressive') {
    deinterlace = true
  }

  // HDR to SDR
  if (
    stream.color_transfer === 'smpte2084'
    && stream.color_primaries === 'bt2020'
    && stream.color_range === 'tv'
  ) {
    hdrToSDR = true
  }

  // convert to 720p
  if (stream.height > 720) {
    resize = true
  }

  const useVf = deinterlace || hdrToSDR || resize

  const vfParameter = useVf ? [
    'hwupload=extra_hw_frames=10',
    'format=qsv',
    resize && 'scale_qsv=-1:720',
    deinterlace && 'vpp_qsv=deinterlace=2',
    ...(hdrToSDR ? [
      'hwdownload,format=nv12',
      'zscale=t=linear:npl=100,format=yuv420p',
    ] : []),
  ].filter(Boolean).join(',') : []

  return {useVf, vfParameter}
}

module.exports = async (args) => {
  // const checkFfmpegCommandInit = require("../../../../FlowHelpers/1.0.0/interfaces/flowUtils")
  // checkFfmpegCommandInit(args)

  let shouldAppendQsvParameter = false

  args.variables.ffmpegCommand.streams.forEach((stream) => {
    if (stream.codec_type === 'video') {
      const { useVf, vfParameter } = createVfParameter(stream)
      if (useVf && vfParameter.length > 0) {
        stream.outputArgs.push('-vf', vfParameter)
        shouldAppendQsvParameter = true
      }
    }
  })

  if (shouldAppendQsvParameter) {
    // -init_hw_device qsv=qsv:hw -hwaccel qsv -filter_hw_device qsv
    args.variables.ffmpegCommand.overallInputArguments.push(
      "-init_hw_device", "qsv=qsv:hw",
      "-hwaccel", "qsv",
      "-hwaccel_output_format", "qsv", // HWデコード
      "-filter_hw_device", "qsv",
    )
  }

  return {
    outputFileObj: args.inputFileObj,
    outputNumber: 1,
    variables: args.variables,
  }
}