Custom image

Hi,
I have always used a custom image that is visible when videos are stopped, using the following function:

add_filter(‘lyte_match_thumburl’,’lyte_my_own_thumburl’);
function lyte_my_own_thumburl($thumb) {return “https://namesite/img.jpg”;}

After the latest updates, however, if I insert more videos in the usual post, or put only one, in the first one, the image no longer appears. Is there something in the code I need to change?

Thank you very much in advance.