merge mp4 and mp3

convert.php

$filename_tmp    = [];
        $filename_tmp[0] = base_path() . "/000.mp4";
        $filename_tmp[2] = base_path() . '/audio.mp3';
    
       $ffmpeg = FFMpeg\FFMpeg::create([
            'ffmpeg.binaries'  => config('pilot.PATH_FFMPEG'),
            'ffprobe.binaries' => config('pilot.PATH_FFPROBE'),
        ]);
        $video = $ffmpeg->open($filename_tmp[0]);
        $video
            ->concat($filename_tmp)
            ->saveFromSameCodecs(base_path() . "/" . time() . '_save.mp4', true);