WordPress at a glance
function is not described

_oembed_filter_feed_content() WP 4.4.0

Prepare the oembed HTML to be displayed in an RSS feed.

No Hooks.

Return

String. The filtered content.

Usage

_oembed_filter_feed_content( $content );
$content(string) (required)
The content to filter.

Code of oembed filter feed content: wp-includes/embed.php VER 5.0.3

<?php
function _oembed_filter_feed_content( $content ) {
	return str_replace( '<iframe class="wp-embedded-content" sandbox="allow-scripts" security="restricted" style="position: absolute; clip: rect(1px, 1px, 1px, 1px);"', '<iframe class="wp-embedded-content" sandbox="allow-scripts" security="restricted"', $content );
}