diff --git a/pack-vid b/pack-vid
index cbe3445..5f3504f 100755
--- a/pack-vid
+++ b/pack-vid
@@ -124,13 +124,13 @@ function convert( $src, $dest, $options ) {
     }
 
     $mbits = 1000 * 1000;
-    if ( $bitrate < $mbits ) {
+    if ( $bitrate < $mbits || $height < 480 ) {
         $frameWidth = 640;
         $frameHeight = 360;
-    } elseif ( $bitrate < 2 * $mbits ) {
+    } elseif ( $bitrate < 2 * $mbits || $height < 720) {
         $frameWidth = 854;
         $frameHeight = 480;
-    } elseif ( $bitrate < 4 * $mbits ) {
+    } elseif ( $bitrate < 4 * $mbits || $height < 1080) {
         $frameWidth = 1280;
         $frameHeight = 720;
     } else {