diff --git a/pack-vid b/pack-vid
index 43a3e11..ebb1057 100755
--- a/pack-vid
+++ b/pack-vid
@@ -108,10 +108,13 @@ function convert( $src, $dest, $options ) {
     }
 
     $mbits = 1000 * 1000;
-    if ( $bitrate < 2 * $mbits ) {
+    if ( $bitrate < $mbits ) {
+        $frameWidth = 640;
+        $frameHeight = 360;
+    } elseif ( $bitrate < 2 * $mbits ) {
         $frameWidth = 854;
         $frameHeight = 480;
-    } else if ( $bitrate <= 4 * $mbits ) {
+    } elseif ( $bitrate < 4 * $mbits ) {
         $frameWidth = 1280;
         $frameHeight = 720;
     } else {