BX Slider by TRS

Yes, this plugin works really fine with newest version as old version!

You can use trs_bx_slider_return_shortcode_html filter like this way.

    add_filter('trs_bx_slider_return_shortcode_html', 'test_func', 10, 3);
    function test_func( $slider, $slider_id ){
        if (absint($slider_id) === 4){
            $html = '<div class="your-custom-class">';
            $html .= $slider;
            $html .= '</div>';

            return $html;
        }

        // default
        return $slider;
    }

You are getting this error because you are using image or video that is supported by BX slider by TRS.
We support mp4, webm and ogg video type that is compatible with HTML video element. Same in case with images.
But you can extend and add your own extensions by using below filters.

    'trs_bx_slider_add_image_types'
    'trs_bx_slider_add_video_types'

Example:
Add More Images Extensions

    add_filter('trs_bx_slider_add_image_types', 'test_func', 10);
    function test_func( $image_types ){
        $image_types[] = 'dwg';
        $image_types[] = 'any-other-image-extension';


        return $image_types;
    }

Add More Videos Extensions

    add_filter('trs_bx_slider_add_video_types', 'test_func', 10);
    function test_func( $video_types ){
        $video_types[] = 'mp3';
        $video_types[] = 'avi';
        $video_types[] = 'any-other-video-extension';

        return $video_types;
    }