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solution found on advanced custom fields support forum. kudos to EbbandFlow
<?php
//For use with a single field.
$video = get_field('video'); //Embed Code
$video_url = get_field('video', FALSE, FALSE); //URL
$video_thumb_url = get_video_thumbnail_uri($video_url); //get THumbnail via our functions in functions.php ?>
<?php //Lightbox Link via Thumbnail ?>
<a href="#lightbox"><img src="<?php echo $video_thumb_url; ?>"/></a>
<?php //Lightbox Element with Video Embed Code ?>
<div id="lightbox" class="embed-container">
<?php echo $video; ?>
</div>
<?php
//For Use with Repeater Field
$videos = get_field('videos');
$videos_raw = get_field('videos', FALSE, FALSE);
//Add the Thubmnail to the $videos object
foreach($videos_raw as $key => $video_raw) :
$videos[$key]['video_thumb'] = get_video_thumbnail_uri($video_raw['field_5449746362c3d']); //Replace 'field_5449746362c3d' with your field's Field key (obtainable by going to screen options in the fields admin, and setting 'Show Field Key' to 'Yes')
endforeach;
//Loop through the $videos object
foreach($videos as $video): ?>
<?php //Lightbox Link via Thumbnail ?>
<a href="#lightbox"><img src="<?php echo $video['video_thumb']; ?>"/></a>
<?php //Lightbox Element with Video Embed Code ?>
<div id="lightbox" class="embed-container">
<?php echo $video['video'] ?></div>
<? endforeach; ?>
<?php
function get_video_thumbnail_uri( $video_uri ) {
$thumbnail_uri = '';
// determine the type of video and the video id
$video = parse_video_uri( $video_uri );
// get youtube thumbnail
if ( $video['type'] == 'youtube' )
$thumbnail_uri = 'http://img.youtube.com/vi/' . $video['id'] . '/hqdefault.jpg';
// get vimeo thumbnail
if( $video['type'] == 'vimeo' )
$thumbnail_uri = get_vimeo_thumbnail_uri( $video['id'] );
// get wistia thumbnail
if( $video['type'] == 'wistia' )
$thumbnail_uri = get_wistia_thumbnail_uri( $video_uri );
// get default/placeholder thumbnail
if( empty( $thumbnail_uri ) || is_wp_error( $thumbnail_uri ) )
$thumbnail_uri = '';
//return thumbnail uri
return $thumbnail_uri;
}
/**
* Parse the video uri/url to determine the video type/source and the video id
*/
function parse_video_uri( $url ) {
// Parse the url
$parse = parse_url( $url );
// Set blank variables
$video_type = '';
$video_id = '';
// Url is http://youtu.be/xxxx
if ( $parse['host'] == 'youtu.be' ) {
$video_type = 'youtube';
$video_id = ltrim( $parse['path'],'/' );
}
// Url is http://www.youtube.com/watch?v=xxxx
// or http://www.youtube.com/watch?feature=player_embedded&v=xxx
// or http://www.youtube.com/embed/xxxx
if ( ( $parse['host'] == 'youtube.com' ) || ( $parse['host'] == 'www.youtube.com' ) ) {
$video_type = 'youtube';
parse_str( $parse['query'] );
$video_id = $v;
if ( !empty( $feature ) )
$video_id = end( explode( 'v=', $parse['query'] ) );
if ( strpos( $parse['path'], 'embed' ) == 1 )
$video_id = end( explode( '/', $parse['path'] ) );
}
// Url is http://www.vimeo.com
if ( ( $parse['host'] == 'vimeo.com' ) || ( $parse['host'] == 'www.vimeo.com' ) ) {
$video_type = 'vimeo';
$video_id = ltrim( $parse['path'],'/' );
}
$host_names = explode(".", $parse['host'] );
$rebuild = ( ! empty( $host_names[1] ) ? $host_names[1] : '') . '.' . ( ! empty($host_names[2] ) ? $host_names[2] : '');
// Url is an oembed url wistia.com
if ( ( $rebuild == 'wistia.com' ) || ( $rebuild == 'wi.st.com' ) ) {
$video_type = 'wistia';
if ( strpos( $parse['path'], 'medias' ) == 1 )
$video_id = end( explode( '/', $parse['path'] ) );
}
// If recognised type return video array
if ( !empty( $video_type ) ) {
$video_array = array(
'type' => $video_type,
'id' => $video_id
);
return $video_array;
} else {
return false;
}
}
/* Takes a Vimeo video/clip ID and calls the Vimeo API v2 to get the large thumbnail URL.*/
function get_vimeo_thumbnail_uri( $clip_id ) {
$vimeo_api_uri = 'http://vimeo.com/api/v2/video/' . $clip_id . '.php';
$vimeo_response = wp_remote_get( $vimeo_api_uri );
if( is_wp_error( $vimeo_response ) ) {
return $vimeo_response;
} else {
$vimeo_response = unserialize( $vimeo_response['body'] );
return $vimeo_response[0]['thumbnail_large'];
}
}
/**
* Takes a wistia oembed url and gets the video thumbnail url.
*/
function get_wistia_thumbnail_uri( $video_uri ) {
if ( empty($video_uri) )
return false;
$wistia_api_uri = 'http://fast.wistia.com/oembed?url=' . $video_uri;
$wistia_response = wp_remote_get( $wistia_api_uri );
if( is_wp_error( $wistia_response ) ) {
return $wistia_response;
} else {
$wistia_response = json_decode( $wistia_response['body'], true );
return $wistia_response['thumbnail_url'];
}
}
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