if (! function_exists('postHandlerVideoThumb')) {

	function postHandlerVideoThumb($post) {
		# exclude mp4 and webm; 設定値. ffmpegが解釈出来る動画拡張子を列挙.
		$ffmpeg_extensions = ['flv', 'wmv', 'asf', 'mpeg', 'mpg', 'avi', 'ts', 'm2ts', 'mov', 'mkv'];
		global $board, $config;
		if (! $post->has_file) {
			return;
		};
		if (! $config['webm']['use_ffmpeg']) {
			return;
		};

		foreach ($post->files as &$file) {

			if (! in_array($file->extension, $ffmpeg_extensions)) {
				continue;
			};
			if ($file->thumb == 'spoiler') {
				continue;
			}
			elseif ($file->thumb == 'file' || $file->thumb == '') {
				# do nothing;
			}
			else {
				continue;
			};
		
			# ref: vichan/inc/lib/webm/ffmpeg.php: get_webm_info,
			require_once dirname(__FILE__) . '/lib/webm/ffmpeg.php';
			
			$video_info = get_video_info($file->file_path);
			if (! empty($video_info['error'])) {
				return 'postHandlerVideoThumb:' . $video_info['error']['msg'];
			};
			if ($config['spoiler_images'] && isset($_POST['spoiler'])) {
				$file = webm_set_spoiler($file);
			}
			else {
				$file->width = $video_info['width'];
				$file->height = $video_info['height'];
				$file = set_thumbnail_dimensions($post, $file);
				$tn_path = $board['dir'] . $config['dir']['thumb'] . $file->file_id . '.jpg';
				
				if(0 == make_webm_thumbnail($file->file_path, $tn_path, $file->thumbwidth, $file->thumbheight, $video_info['duration'])) {
					$file->thumb = $file->file_id . '.jpg';
				}
				else {
					# do nothing
				};
			};
		};
	};

	function get_video_info($filename) {
		global $board, $config;
		$filename = escapeshellarg($filename);
		$ffprobe = $config['webm']['ffprobe_path'];
		$ffprobe_out = array();
		$info = array();
		exec("$ffprobe -v quiet -print_format json -show_format -show_streams $filename", $ffprobe_out);
		$ffprobe_out = json_decode(implode("\n", $ffprobe_out), 1);
		$info['duration'] = $ffprobe_out['format']['duration'];
		foreach ($ffprobe_out['streams'] as $stream) {
			if ($stream['width'] != '' && $stream['height'] != '') {
				$info['width'] = $stream['width'];
				$info['height'] = $stream['height'];
				break;
			};
		};
		return $info;
	};
};

# mp4 と webm 以外の動画にもサムネイルを付ける(インラインプレイヤーとは別設定)
# この行で設定が有効になる。
event_handler('post', function($post) { return postHandlerVideoThumb($post); });