diff --git a/inc/lib/webm/ffmpeg.php b/inc/lib/webm/ffmpeg.php
index f62bfced..810c68c1 100644
--- a/inc/lib/webm/ffmpeg.php
+++ b/inc/lib/webm/ffmpeg.php
@@ -5,17 +5,18 @@
  */
 
 function get_webm_info($filename) {
-	global $board, $config;
+	global $config;
+
 	$filename = escapeshellarg($filename);
 	$ffprobe = $config['webm']['ffprobe_path'];
-	$ffprobe_out = array();
-	$webminfo = array();
+	$ffprobe_out = [];
+	$webminfo = [];
 
 	exec("$ffprobe -v quiet -print_format json -show_format -show_streams $filename", $ffprobe_out);
 	$ffprobe_out = json_decode(implode("\n", $ffprobe_out), 1);
 	$validcheck = is_valid_webm($ffprobe_out);
 	$webminfo['error'] = $validcheck['error'];
-	if(empty($webminfo['error'])) {
+	if (empty($webminfo['error'])) {
 		$trackmap = $validcheck['trackmap'];
 		$videoidx = $trackmap['videoat'][0];
 		$webminfo['width'] = $ffprobe_out['streams'][$videoidx]['width'];
@@ -26,97 +27,131 @@ function get_webm_info($filename) {
 }
 
 function locate_webm_tracks($ffprobe_out) {
-    $streams     = $ffprobe_out['streams'];
-    $streamcount = count($streams);
-    $videoat     = array();
-    $audioat     = array();
-    $others      = array();
+	$streams = $ffprobe_out['streams'];
+	$streamcount = count($streams);
+	$video_at = [];
+	$audio_at = [];
+	$others = [];
 
-    for ($k = 0; $k < $streamcount; $k++) {
-        $stream     = $streams[$k];
-        $codec_type = $stream['codec_type'];
+	for ($k = 0; $k < $streamcount; $k++) {
+		$stream = $streams[$k];
+		$codec_type = $stream['codec_type'];
 
-        if ($codec_type === 'video') {
-            $videoat[] = $k;
-        } elseif($codec_type === 'audio') {
-            $audioat[] = $k;
-        } else {
-            if (isset($others[$codec_type])) {
-                $others[$codec_type][] = $k;
-            } else {
-                $others[$codec_type] = [$k];
-            }
-        }
-    }
+		if ($codec_type === 'video') {
+			$video_at[] = $k;
+		} elseif ($codec_type === 'audio') {
+			$audio_at[] = $k;
+		} else {
+			if (isset($others[$codec_type])) {
+				$others[$codec_type][] = $k;
+			} else {
+				$others[$codec_type] = [$k];
+			}
+		}
+	}
 
-    return array('videoat' => $videoat, 'audioat' => $audioat, 'others' => $others);
-/*
-var_dump example:
-array(3) {
-  ["videoat"]=>  array(1) {
-    [0]=>    int(0)
-  }
-  ["audioat"]=>  array(1) {
-    [0]=>    int(1)
-  }
-  ["others"]=>  array(1) {
-    ["data"]=>    array(2) {
-      [0]=>      int(2)
-      [1]=>      int(3)
-    }
-  }
-}
- */
+	return [ 'videoat' => $video_at, 'audioat' => $audio_at, 'others' => $others ];
 }
 
 function is_valid_webm($ffprobe_out) {
-	global $board, $config;
-	if (empty($ffprobe_out))
-		return array('error' => array('code' => 1, 'msg' => $config['error']['genwebmerror']));
+	global $config;
+
+	if (empty($ffprobe_out)) {
+		return [ 'error' => [ 'code' => 1, 'msg' => $config['error']['genwebmerror'] ] ];
+	}
 	$trackmap = locate_webm_tracks($ffprobe_out);
 
 	// one video track
-	if (count($trackmap['videoat']) != 1)
-		return array('error' => array('code' => 2, 'msg' => $config['error']['invalidwebm']." [video track count]"));
+	if (count($trackmap['videoat']) != 1) {
+		return [
+			'error' => [
+				'code' => 2,
+				'msg' => $config['error']['invalidwebm'] . ' [video track count]'
+			]
+		];
+	}
 	$videoidx = $trackmap['videoat'][0];
 
 	$extension = pathinfo($ffprobe_out['format']['filename'], PATHINFO_EXTENSION);
 	if ($extension === 'webm' && !stristr($ffprobe_out['format']['format_name'], 'mp4')) {
-		if ($ffprobe_out['format']['format_name'] != 'matroska,webm')
-			return array('error' => array('code' => 2, 'msg' => $config['error']['invalidwebm']."error 1"));
+		if ($ffprobe_out['format']['format_name'] != 'matroska,webm') {
+			return [
+				'error' => [
+					'code' => 2,
+					'msg' => $config['error']['invalidwebm'] . 'error 1'
+				]
+			];
+		}
 	} elseif ($extension === 'mp4' || stristr($ffprobe_out['format']['format_name'], 'mp4')) {
-		// if the video is not h264 or (there is audio but it's not aac)
-		if (($ffprobe_out['streams'][$videoidx]['codec_name'] != 'h264') || ((count($trackmap['audioat']) > 0) && ($ffprobe_out['streams'][$trackmap['audioat'][0]]['codec_name'] != 'aac')))
-			return array('error' => array('code' => 2, 'msg' => $config['error']['invalidwebm']." [h264/aac check]"));
+		// If the video is not h264 or (there is audio but it's not aac).
+		if (($ffprobe_out['streams'][$videoidx]['codec_name'] != 'h264') || ((count($trackmap['audioat']) > 0) && ($ffprobe_out['streams'][$trackmap['audioat'][0]]['codec_name'] != 'aac'))) {
+			return [
+				'error' => [
+					'code' => 2,
+					'msg' => $config['error']['invalidwebm'] . ' [h264/aac check]'
+				]
+			];
+		}
 	} else {
-		return array('error' => array('code' => 1, 'msg' => $config['error']['genwebmerror']."error 3"));
+		return [
+			'error' => [
+				'code' => 1,
+				'msg' => $config['error']['genwebmerror'] . 'error 3'
+			]
+		];
+	}
+	if ((count($ffprobe_out['streams']) > 1) && (!$config['webm']['allow_audio'])) {
+		return [
+			'error' => [
+				'code' => 3,
+				'msg' => $config['error']['webmhasaudio'] . 'error 4'
+			]
+		];
 	}
-	if ((count($ffprobe_out['streams']) > 1) && (!$config['webm']['allow_audio']))
-		return array('error' => array('code' => 3, 'msg' => $config['error']['webmhasaudio']."error 4"));
 	if ((count($trackmap['audioat']) > 0) && !$config['webm']['allow_audio']) {
-		return array('error' => array('code' => 3, 'msg' => $config['error']['webmhasaudio']."error 5"));
+		return [
+			'error' => [
+				'code' => 3,
+				'msg' => $config['error']['webmhasaudio'] . 'error 5'
+			]
+		];
 	}
-	if ($ffprobe_out['format']['duration'] > $config['webm']['max_length'])
-		return array('error' => array('code' => 4, 'msg' => sprintf($config['error']['webmtoolong'], $config['webm']['max_length'])."error 6"));
-	return array('error' => array(), 'trackmap' => $trackmap);
+	if ($ffprobe_out['format']['duration'] > $config['webm']['max_length']) {
+		return [
+			'error' => [
+				'code' => 4,
+				'msg' => sprintf($config['error']['webmtoolong'], $config['webm']['max_length']) . 'error 6'
+			]
+		];
+	}
+	return [
+		'error' => [],
+		'trackmap' => $trackmap
+	];
 }
+
 function make_webm_thumbnail($filename, $thumbnail, $width, $height, $duration) {
-	global $board, $config;
+	global $config;
+
 	$filename = escapeshellarg($filename);
-	$thumbnailfc = escapeshellarg($thumbnail); // Should be safe by default but you
-	// can never be too safe.
+	// Should be safe by default but you can never be too safe.
+	$thumbnailfc = escapeshellarg($thumbnail);
+
+	// Same as above.
 	$width = escapeshellarg($width);
-	$height = escapeshellarg($height); // Same as above.
+	$height = escapeshellarg($height);
 	$ffmpeg = $config['webm']['ffmpeg_path'];
 	$ret = 0;
-	$ffmpeg_out = array();
+	$ffmpeg_out = [];
+
 	exec("$ffmpeg -strict -2 -ss " . floor($duration / 2) . " -i $filename -v quiet -an -vframes 1 -f mjpeg -vf scale=$width:$height $thumbnailfc 2>&1", $ffmpeg_out, $ret);
-	// Work around for https://trac.ffmpeg.org/ticket/4362
+
+	// Work around for https://trac.ffmpeg.org/ticket/4362.
 	if (filesize($thumbnail) === 0) {
-		// try again with first frame
+		// Try again with first frame.
 		exec("$ffmpeg -y -strict -2 -ss 0 -i $filename -v quiet -an -vframes 1 -f mjpeg -vf scale=$width:$height $thumbnailfc 2>&1", $ffmpeg_out, $ret);
 		clearstatcache();
-		// failed if no thumbnail size even if ret code 0, ffmpeg is buggy
+		// Failed if no thumbnail size even if ret code 0, ffmpeg is buggy.
 		if (filesize($thumbnail) === 0) {
 			$ret = 1;
 		}