Not working on my theme?

Resolved

(@kakara)

Not working with DeTube.
Here is what DeTube uses as featured image?
Can I change something in plugin or in this code to make it work, I would rather change in plugin if possible…

/**
 * Get Video Thumbnail URL
 *
 * @param string $size Optional. Image size. Defaults to 'custom-medium';.
 */
function dp_thumb_url($size = 'custom-medium', $default = '', $post_id = null, $echo = false){
	global $post;

	if(!$post_id)
		$post_id = $post->ID;
	if(!$size)
		$size == 'custom-medium';

	/* Check if this video has a feature image */
	if(has_post_thumbnail() && $thumb = wp_get_attachment_image_src(get_post_thumbnail_id($post_id), $size))
		$thumb_url = $thumb[0];

	/* If no feature image, try to get thumbnail by "Video Thumbnails" plugin */
	if(empty($thumb_url) && function_exists('get_video_thumbnail')) {
		$video_thumbnail = get_video_thumbnail($post_id);
		if(!is_wp_error($video_thumbnail))
			$thumb_url = $video_thumbnail;
	}

	/* If this is a video by jplayer, try to get thumbnail from video_posts */
	if(empty($thumb_url) && $poster = get_post_meta($post_id, 'dp_video_poster', true))
		$thumb_url = $poster;

	/* If still no image or is wp error, define default image */
	if(empty($thumb_url) || is_wp_error($thumb_url)) {
		if($default === false || $default === 0)
			return false;

		$thumb_url = !empty($default) ? $default : get_template_directory_uri().'/images/nothumb.png';
	}

	if($echo)
		echo $thumb_url;
	else
		return $thumb_url;
} 

/**
 * Display Video Thumbnail HTML
 *
 * @param int $size Optional. Image size. Defaults to 'custom-medium';.
 */
function dp_thumb_html($size = 'custom-medium', $default = '', $post_id = null, $echo = true) {
	global $post;

	if(!$post_id)
		$post_id = $post->ID;
	if(!$size)
		$size == 'custom-medium';

	// Get thumb url
	$thumb_url = dp_thumb_url($size, $default, $post_id, false);

	$html = '
	<div class="thumb">
		<a class="clip-link" data-id="'.$post->ID.'" title="'.esc_attr(get_the_title($post_id)).'" href="'.get_permalink($post_id).'">
			<span class="clip">
				<img src="'.$thumb_url.'" alt="'.esc_attr(get_the_title($post_id)).'" /><span class="vertical-align"></span>
			</span>

			<span class="overlay"></span>
		</a>
	</div>';

	if($echo)
		echo $html;
	else
		return $html;
}