How to add attribute to output with wp_video_shortcode add_filter

by

I get Undefined variable: for $video, $post_id and $library and the
video’s in the page are blank.

Replace:

add_filter( 'wp_video_shortcode', 'my_video_shortcode', 10, 2 );

with:

add_filter( 'wp_video_shortcode', 'my_video_shortcode', 10, 5 );

to access all five input arguments in your filter’s callback.

ps: my_ is such a common prefix, that I would consider something more unique.

pps: Here’s another approach by overriding the shortcode:

add_shortcode( 'video', function ( $atts, $content ) 
{
    $output = wp_video_shortcode( $atts, $content );

    if( ! isset( $atts['muted'] ) || ! wp_validate_boolean( $atts['muted'] ) ) 
        return $output;

    if( false !== stripos( $output, ' muted="1"' ) )
        return $output;

    return str_ireplace( '<video ', '<video muted="1" ', $output ); 
} );

where the muted attribute is activated with:

Hope you can adjust it to your needs!

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