(Disclaimer: I am a designer by choice and a programmer only by necessity. Meaning I can somewhat read PHP code, but I have a harder time writing it myself. I wish I could be better though, and this post is an attempt at understanding PHP a bit better. I probably don’t know enough to ask this question in theright way or even using the right terms, so please bear with me. )

I have a custom post type plugin that is adding some custom fields to the admin screens, including a video meta box field. Now I need to remove the video field, and I’m wondering if you can do that fairly easy with some sort of clever unset/unregister/remove function?

I think I have identified the relevant piece of code from the plugin, but of course I don’t want to edit the plugin itself – but rather add some code in a functions file or similar. Can you give me some pointers in the right direction?

<?php
/**
 * Class SixTenPressSermonsCustomFields
 */
class SixTenPressSermonsCustomFields extends SixTenPressCustomFields {

/* shortened for sake of the question */

/**
     * Define the custom sermon fields.
     * @return array
     */
    protected function get_file_fields() {
        $this->setting = sixtenpresssermons_get_setting();
        return array(
            array(
                'type'        => 'file',
                'setting'     => 'mp3',
                'label'       => __( 'Audio', 'sixtenpress-sermons' ),
                'description' => __( 'Upload the audio file (MP3 format) or paste the URL for external MP3 (eg, SoundCloud).', 'sixtenpress-sermons' ),
                'library'     => array( 'audio' ),
            ),
            array(
                'type'        => 'file',
                'setting'     => 'video',
                'label'       => __( 'Video', 'sixtenpress-sermons' ),
                'description' => __( 'Upload the video file (MP4 format) or paste the URL for external video (YouTube, Vimeo).', 'sixtenpress-sermons' ),
                'library'     => array( 'video' ),
            ),
            array(
                'type'        => 'file',
                'setting'     => 'file',
                'label'       => __( 'File', 'sixtenpress-sermons' ),
                'description' => __( 'Upload a related file (pdf format). This could be sermon notes or a weekly bulletin.', 'sixtenpress-sermons' ),
                'library'     => array( 'application' ),
            ),
        );
    }

Can I use something in the functions.php file to remove the video field above? Like maybe:

<?php

function remove_video_field() {
        /* not working, just guessing */
       unset( sixtenpresssermons_get_setting ); 

        /*specify Video option here somehow? */
}

add_action('remove_video_field','SixTenPressSermonsCustomFields');
// also not working, just me guessing here