function video_get_post_by_guid( $guid ) {
  $args = array(
    'post_type'      => 'attachment',
    'post_mime_type' => 'video/videopress',
    'post_status'    => 'inherit',
    'meta_query'     => array(
      array(
        'key'     => 'videopress_guid',
        'value'   => $guid,
        'compare' => '=',
      ),
    ),
  );

  $query = new WP_Query( $args );

  $post = $query->next_post();

  return $post;
}