function variantTrack(id, height, language, bandwidth) {
    const videoId = id * 2;
    const audioId = id * 2 + 1;
    return {
      id: id,
      active: false,
      type: 'variant',
      bandwidth: bandwidth,
      language: language,
      originalLanguage: language,
      label: null,
      kind: null,
      width: height * (16 / 9),
      height: height,
      frameRate: 30,
      pixelAspectRatio: '59:54',
      hdr: null,
      colorGamut: null,
      videoLayout: null,
      mimeType: 'video/mp4,audio/mp4',
      audioMimeType: 'audio/mp4',
      videoMimeType: 'video/mp4',
      codecs: 'mp4,mp4',
      audioCodec: 'mp4',
      videoCodec: 'mp4',
      primary: false,
      roles: [],
      audioRoles: [],
      forced: false,
      videoId: videoId,
      audioId: audioId,
      audioGroupId: null,
      channelsCount: 2,
      audioSamplingRate: 48000,
      spatialAudio: false,
      tilesLayout: null,
      audioBandwidth: bandwidth * 0.33,
      videoBandwidth: bandwidth * 0.67,
      originalVideoId: videoId.toString(),
      originalAudioId: audioId.toString(),
      originalTextId: null,
      originalImageId: null,
      accessibilityPurpose: null,
    };
  }
@param {number} id
@param {number} height
@param {string} language
@param {number} bandwidth
@return {shaka.extern.Track}