Remove existing thumbnail after retranscoding

Author: dharmin

admin/rt-retranscode-admin.php

@@ -849,6 +849,10 @@ public function transcoded_thumbnails_added( $media_id = '' ) {
 				wp_update_attachment_metadata( $media_id, $attach_data );
 			} else {
 				// Insert transcoded thumbnail attachment for video/audio files.
+				$existing_thumbnail = get_post_thumbnail_id( $media_id );
+				if ( ! empty( $existing_thumbnail ) ) {
+					wp_delete_attachment( $existing_thumbnail, true );
+				}
 				$attachment_id = wp_insert_attachment( $attachment, $thumbnail_src, $media_id );
 			}