marnickmenting

What I did to get video thumbnails is pasting in thumbnailforexcerpts.php after:

//last try, for images with src without quotes
	if(empty($src)){
		preg_match_all('~src=([^\'"]+) ~', $first_image, $matches);
		$src=$matches[1][0];
		$srcorig=$matches[1][0];
	}

this code:

if(empty($src)){ // if no images found, try to find a youtube video
		preg_match_all('~\[youtube [^\>]*\]~', $content, $matches); // find the youtube quicktag
		$first_image = $matches[0][0];
		preg_match_all('~\[youtube ([^\'"]+)\]~', $first_image, $matches); // extract the videoId
		if(!empty($matches[1][0]))
		{
			$src="http://img.youtube.com/vi/" . $matches[1][0] . "/2.jpg"; // get the thumbnail from the middle frame of the video
			$srcorig=$src;
		}
	}
	if(empty($src)){ // if no images found, try to find a vimeo video
		preg_match_all('~\[vimeo [^\>]*\]~', $content, $matches); // find the vimeo quicktag
		$first_image = $matches[0][0];
		preg_match_all('~\[vimeo ([^\'"]+)\]~', $first_image, $matches); // extract the videoId
		if(!empty($matches[1][0]))
		{
			$hash = unserialize(file_get_contents("http://vimeo.com/api/v2/video/".$matches[1][0].".php")); // retrieve serialized data about video and put it in an array
			$src=$hash[0]['thumbnail_medium']; // show 200px thumbnail
			$srcorig=$src;
		}
	}
	if(empty($src)){ // if no images found, try to find a google video
		preg_match_all('~\[googlevideo [^\>]*\]~', $content, $matches); // find the googlevideo quicktag
		$first_image = $matches[0][0];
		preg_match_all('~\[googlevideo ([^\'"]+)\]~', $first_image, $matches); // extract the videoId
		if(!empty($matches[1][0]))
		{
			$hash = file_get_contents("http://video.google.com/videofeed?docid=" . $matches[1][0]); // retrieve xml about video
			preg_match_all('~media:thumbnail url=[\'"]([^\'"]+)[\'"]~',$hash,$matches); // find thumbnail url in xml
			$src = $matches[1][0];
			$srcorig=$src;
		}
	}

This script will get the thumbnails from the video host servers, if there are no images found.

You should have VideoWarrior or similar plugin to use the [youtube videoId] tags.