async function analyzeObjectTracking()

in video-intelligence/analyze.js [499:555]

• 43 lines of code
• 5 McCabe index (conditional complexity)

async function analyzeObjectTracking(path) {
  //[START video_object_tracking]
  // Imports the Google Cloud Video Intelligence library
  const Video = require('@google-cloud/video-intelligence');
  const fs = require('fs');
  const util = require('util');
  // Creates a client
  const video = new Video.VideoIntelligenceServiceClient();
  /**
   * TODO(developer): Uncomment the following line before running the sample.
   */
  // const path = 'Local file to analyze, e.g. ./my-file.mp4';

  // Reads a local video file and converts it to base64
  const file = await util.promisify(fs.readFile)(path);
  const inputContent = file.toString('base64');

  const request = {
    inputContent: inputContent,
    features: ['OBJECT_TRACKING'],
    //recommended to use us-east1 for the best latency due to different types of processors used in this region and others
    locationId: 'us-east1',
  };
  // Detects objects in a video
  const [operation] = await video.annotateVideo(request);
  const results = await operation.promise();
  console.log('Waiting for operation to complete...');
  //Gets annotations for video
  const annotations = results[0].annotationResults[0];
  const objects = annotations.objectAnnotations;
  objects.forEach(object => {
    console.log(`Entity description:  ${object.entity.description}`);
    console.log(`Entity id: ${object.entity.entityId}`);
    const time = object.segment;
    console.log(
      `Segment: ${time.startTimeOffset.seconds || 0}` +
        `.${(time.startTimeOffset.nanos / 1e6).toFixed(0)}s to ${
          time.endTimeOffset.seconds || 0
        }.` +
        `${(time.endTimeOffset.nanos / 1e6).toFixed(0)}s`
    );
    console.log(`Confidence: ${object.confidence}`);
    const frame = object.frames[0];
    const box = frame.normalizedBoundingBox;
    const timeOffset = frame.timeOffset;
    console.log(
      `Time offset for the first frame: ${timeOffset.seconds || 0}` +
        `.${(timeOffset.nanos / 1e6).toFixed(0)}s`
    );
    console.log('Bounding box position:');
    console.log(` left   :${box.left}`);
    console.log(` top    :${box.top}`);
    console.log(` right  :${box.right}`);
    console.log(` bottom :${box.bottom}`);
  });
  // [END video_object_tracking]
}