diff --git a/pack-vid b/pack-vid
index 4c84e66..c5894f8 100755
--- a/pack-vid
+++ b/pack-vid
@@ -171,7 +171,19 @@ function convert( $src, $dest, $options ) {
 
     $mbits = 1000 * 1000;
     $base = intval( $mbits * floatval( $options['quality'] ) );
-    if ( $bitrate < 1 * $base || $height < 480 ) {
+    if ( $bitrate < 0.125 * $base || $height < 144 ) {
+        $frameWidth = 256;
+        $frameHeight = 144;
+        $bitrate = min( $bitrate, $base * 0.25 );
+    } elseif ( $bitrate < 0.25 * $base || $height < 180 ) {
+        $frameWidth = 320;
+        $frameHeight = 180;
+        $bitrate = min( $bitrate, $base * 0.5 );
+    } elseif ( $bitrate < 0.5 * $base || $height < 288 ) {
+        $frameWidth = 512;
+        $frameHeight = 288;
+        $bitrate = min( $bitrate, $base * 0.5 );
+    } elseif ( $bitrate < 1 * $base || $height < 480 ) {
         $frameWidth = 640;
         $frameHeight = 360;
         $bitrate = min( $bitrate, $base );