VideoValidationController for my video validation controller file

VideoValidationController.php

<?php

namespace App\Http\Controllers;

use App\Rules\VideoDurationValidation;
use Illuminate\Http\Request;
use Illuminate\Support\Facades\Validator;

class VideoValidationController extends Controller
{
    public function get_form()
    {
        return view('test');
    }

    public function validate_length(Request $request)
    {
        $validator = Validator::make($request->all(), [
            'video' => ['required', 'file', 'mimetypes:video/x-m-asf,video/x-flv,video/mp4,application/x-mpegURL,video/MP2T,video/3gpp,video/quicktime,video/x-msvideo,video/x-ms-wmv,video/avi,video/webm', new VideoDurationValidation(1, 3)]
        ]); 

        // ddd($request->video);
        // $request->video->move(public_path('data'));
        if($validator->fails()){
            $errors = $validator->errors()->toArray();
            $message = reset($errors)[0];
            // ddd($errors);
            return back()->with('error', $message);
        }
        return back()->with('success', 'video validated successfully');
    }
}