Using a php generator to parse and process Drupal media entities. Executable using drush scr

parse-media.php

<?php

use Drupal\media\Entity\Media;

// Get the ids of all media entities.
$media_ids = \Drupal::entityQuery('media')
  ->accessCheck(FALSE)
  ->execute();

// Load and process each media entity.
foreach (getMediaEntities($media_ids) as $media) {
  echo $media->id() . PHP_EOL;
}

/**
 * Get media entities one by one by their ids.
 *
 * @param int[] $media_ids
 *   The media entity ids.
 *
 * @return Generator
 *   The media entities, one by one.
 */
function getMediaEntities(array $media_ids): Generator {
  foreach ($media_ids as $id) {
    $media = Media::load($id);
    if ($media !== NULL) {
      yield $media;
    }
  }
}