public function video_source_migration() {
		$args = [
			'posts_per_page' => 500,
			'meta_query' => [
				[
					'relation' => 'OR',
					[
						'key' =>  Event_Meta::$key_virtual,
						'value' => true,
					],
					[
						'key' =>  Event_Meta::$key_virtual,
						'value' => 'yes',
					]
				],
				[
					'key' =>  Event_Meta::$key_video_source,
					'compare' => 'NOT EXISTS',
				]
			],
		];

		$virtual_events = tribe_events()->by_args( $args )->get_ids();

		foreach ( $virtual_events as $event_id ) {
			$event = tribe_get_event( $event_id );

			// Safety check.
			if ( $event->virtual_video_source ) {
				continue;
			}

			// If a virtual event has zoom as the meeting provider
			if ( 'zoom' === $event->virtual_meeting_provider ) {
				update_post_meta( $event_id, Event_Meta::$key_video_source, 'zoom' );

				continue;
			}

			// Default to video as the video source.
			update_post_meta( $event_id, Event_Meta::$key_video_source, 'video' );
		}
	}