AutoPlay

<p-galleria
  [(value)]="images"
  [responsiveOptions]="responsiveOptions"
  [containerStyle]="{ 'max-width': '640px' }"
  [numVisible]="5"
  [circular]="true"
  [autoPlay]="true"
  [transitionInterval]="2000"
>
  <ng-template pTemplate="item" let-item>
    <img [src]="item.previewImageSrc" style="width: 100%; display: block" />
  </ng-template>
  <ng-template pTemplate="thumbnail" let-item>
    <div class="p-grid p-nogutter p-justify-center">
      <img [src]="item.thumbnailImageSrc" style="display: block" />
    </div>
  </ng-template>
</p-galleria>